ConstantFolding.cpp revision 616025007abbb0fb53fe53ef2cac81907668c2f0
183e3c4f9d796a5da223a3ebd5d4ba985c7ecc39dDan Gohman//===-- ConstantFolding.cpp - Fold instructions into constants ------------===// 2bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// 3bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// The LLVM Compiler Infrastructure 4bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// 54ee451de366474b9c228b4e5fa573795a715216dChris Lattner// This file is distributed under the University of Illinois Open Source 64ee451de366474b9c228b4e5fa573795a715216dChris Lattner// License. See LICENSE.TXT for details. 7bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// 8bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell//===----------------------------------------------------------------------===// 9bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// 1083e3c4f9d796a5da223a3ebd5d4ba985c7ecc39dDan Gohman// This file defines routines for folding instructions into constants. 1183e3c4f9d796a5da223a3ebd5d4ba985c7ecc39dDan Gohman// 12c2c50cdcdc19a1bca993c06d13d8cdca87083ce4Chandler Carruth// Also, to supplement the basic IR ConstantExpr simplifications, 1383e3c4f9d796a5da223a3ebd5d4ba985c7ecc39dDan Gohman// this file defines some additional folding routines that can make use of 14c2c50cdcdc19a1bca993c06d13d8cdca87083ce4Chandler Carruth// DataLayout information. These functions cannot go in IR due to library 1583e3c4f9d796a5da223a3ebd5d4ba985c7ecc39dDan Gohman// dependency issues. 16bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// 17bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell//===----------------------------------------------------------------------===// 18bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 19bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include "llvm/Analysis/ConstantFolding.h" 20d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/ADT/SmallVector.h" 21d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/ADT/StringMap.h" 22d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/Analysis/ValueTracking.h" 230b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/Constants.h" 240b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/DataLayout.h" 250b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/DerivedTypes.h" 260b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/Function.h" 270b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/GlobalVariable.h" 280b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/Instructions.h" 290b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/Intrinsics.h" 300b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/Operator.h" 31c25e7581b9b8088910da31702d4ca21c4734c6d7Torok Edwin#include "llvm/Support/ErrorHandling.h" 32d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/Support/FEnv.h" 33bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include "llvm/Support/GetElementPtrTypeIterator.h" 34bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include "llvm/Support/MathExtras.h" 35d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/Target/TargetLibraryInfo.h" 36bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include <cerrno> 3797af751deb9b26fd42fbcee082da9ccc4ded5b45Jeff Cohen#include <cmath> 38bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswellusing namespace llvm; 39bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 4003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner//===----------------------------------------------------------------------===// 4103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner// Constant Folding internal helper functions 4203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner//===----------------------------------------------------------------------===// 4303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 44db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi/// FoldBitCast - Constant fold bitcast, symbolically evaluating it with 453574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow/// DataLayout. This always returns a non-null constant, but it may be a 466333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner/// ConstantExpr if unfoldable. 47db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattnerstatic Constant *FoldBitCast(Constant *C, Type *DestTy, 483574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow const DataLayout &TD) { 494c7c0f23533565c7e2ddf71e01bf50f2aede5f1bNadav Rotem // Catch the obvious splat cases. 504c7c0f23533565c7e2ddf71e01bf50f2aede5f1bNadav Rotem if (C->isNullValue() && !DestTy->isX86_MMXTy()) 514c7c0f23533565c7e2ddf71e01bf50f2aede5f1bNadav Rotem return Constant::getNullValue(DestTy); 524c7c0f23533565c7e2ddf71e01bf50f2aede5f1bNadav Rotem if (C->isAllOnesValue() && !DestTy->isX86_MMXTy()) 534c7c0f23533565c7e2ddf71e01bf50f2aede5f1bNadav Rotem return Constant::getAllOnesValue(DestTy); 544c7c0f23533565c7e2ddf71e01bf50f2aede5f1bNadav Rotem 5504594aeffa3360882eb09a888a0970321b987b16Rafael Espindola // Handle a vector->integer cast. 5604594aeffa3360882eb09a888a0970321b987b16Rafael Espindola if (IntegerType *IT = dyn_cast<IntegerType>(DestTy)) { 57616025007abbb0fb53fe53ef2cac81907668c2f0Michael Ilseman VectorType *VTy = dyn_cast<VectorType>(C->getType()); 58616025007abbb0fb53fe53ef2cac81907668c2f0Michael Ilseman if (VTy == 0) 5904594aeffa3360882eb09a888a0970321b987b16Rafael Espindola return ConstantExpr::getBitCast(C, DestTy); 6004594aeffa3360882eb09a888a0970321b987b16Rafael Espindola 61616025007abbb0fb53fe53ef2cac81907668c2f0Michael Ilseman unsigned NumSrcElts = VTy->getNumElements(); 62616025007abbb0fb53fe53ef2cac81907668c2f0Michael Ilseman Type *SrcEltTy = VTy->getElementType(); 63db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 6404594aeffa3360882eb09a888a0970321b987b16Rafael Espindola // If the vector is a vector of floating point, convert it to vector of int 6504594aeffa3360882eb09a888a0970321b987b16Rafael Espindola // to simplify things. 667302d80490feabfc8a01bee0fa698aab55169544Chris Lattner if (SrcEltTy->isFloatingPointTy()) { 677302d80490feabfc8a01bee0fa698aab55169544Chris Lattner unsigned FPWidth = SrcEltTy->getPrimitiveSizeInBits(); 6804594aeffa3360882eb09a888a0970321b987b16Rafael Espindola Type *SrcIVTy = 6904594aeffa3360882eb09a888a0970321b987b16Rafael Espindola VectorType::get(IntegerType::get(C->getContext(), FPWidth), NumSrcElts); 70c2c50cdcdc19a1bca993c06d13d8cdca87083ce4Chandler Carruth // Ask IR to do the conversion now that #elts line up. 7104594aeffa3360882eb09a888a0970321b987b16Rafael Espindola C = ConstantExpr::getBitCast(C, SrcIVTy); 7204594aeffa3360882eb09a888a0970321b987b16Rafael Espindola } 73db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 74616025007abbb0fb53fe53ef2cac81907668c2f0Michael Ilseman ConstantDataVector *CDV = dyn_cast<ConstantDataVector>(C); 75616025007abbb0fb53fe53ef2cac81907668c2f0Michael Ilseman if (CDV == 0) 76616025007abbb0fb53fe53ef2cac81907668c2f0Michael Ilseman return ConstantExpr::getBitCast(C, DestTy); 77616025007abbb0fb53fe53ef2cac81907668c2f0Michael Ilseman 7804594aeffa3360882eb09a888a0970321b987b16Rafael Espindola // Now that we know that the input value is a vector of integers, just shift 7904594aeffa3360882eb09a888a0970321b987b16Rafael Espindola // and insert them into our result. 807302d80490feabfc8a01bee0fa698aab55169544Chris Lattner unsigned BitShift = TD.getTypeAllocSizeInBits(SrcEltTy); 8104594aeffa3360882eb09a888a0970321b987b16Rafael Espindola APInt Result(IT->getBitWidth(), 0); 8204594aeffa3360882eb09a888a0970321b987b16Rafael Espindola for (unsigned i = 0; i != NumSrcElts; ++i) { 837302d80490feabfc8a01bee0fa698aab55169544Chris Lattner Result <<= BitShift; 847302d80490feabfc8a01bee0fa698aab55169544Chris Lattner if (TD.isLittleEndian()) 857302d80490feabfc8a01bee0fa698aab55169544Chris Lattner Result |= CDV->getElementAsInteger(NumSrcElts-i-1); 867302d80490feabfc8a01bee0fa698aab55169544Chris Lattner else 877302d80490feabfc8a01bee0fa698aab55169544Chris Lattner Result |= CDV->getElementAsInteger(i); 8804594aeffa3360882eb09a888a0970321b987b16Rafael Espindola } 89db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 9004594aeffa3360882eb09a888a0970321b987b16Rafael Espindola return ConstantInt::get(IT, Result); 9104594aeffa3360882eb09a888a0970321b987b16Rafael Espindola } 92db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 931c9fe0361b3f9f5c814ce761b97ecd11637a1d7dNadav Rotem // The code below only handles casts to vectors currently. 94db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner VectorType *DestVTy = dyn_cast<VectorType>(DestTy); 956333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner if (DestVTy == 0) 966333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner return ConstantExpr::getBitCast(C, DestTy); 97db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 9893798daa3ecbfb29624052d3e54d2404ab65897aChris Lattner // If this is a scalar -> vector cast, convert the input into a <1 x scalar> 9993798daa3ecbfb29624052d3e54d2404ab65897aChris Lattner // vector so the code below can handle it uniformly. 10093798daa3ecbfb29624052d3e54d2404ab65897aChris Lattner if (isa<ConstantFP>(C) || isa<ConstantInt>(C)) { 10193798daa3ecbfb29624052d3e54d2404ab65897aChris Lattner Constant *Ops = C; // don't take the address of C! 1022ca5c8644e6c35b3a7910a576ed89cddb7b82c3bChris Lattner return FoldBitCast(ConstantVector::get(Ops), DestTy, TD); 10393798daa3ecbfb29624052d3e54d2404ab65897aChris Lattner } 104db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 10593798daa3ecbfb29624052d3e54d2404ab65897aChris Lattner // If this is a bitcast from constant vector -> vector, fold it. 1066b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner if (!isa<ConstantDataVector>(C) && !isa<ConstantVector>(C)) 10793798daa3ecbfb29624052d3e54d2404ab65897aChris Lattner return ConstantExpr::getBitCast(C, DestTy); 108db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 109c2c50cdcdc19a1bca993c06d13d8cdca87083ce4Chandler Carruth // If the element types match, IR can fold it. 1106333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner unsigned NumDstElt = DestVTy->getNumElements(); 1116b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner unsigned NumSrcElt = C->getType()->getVectorNumElements(); 1126333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner if (NumDstElt == NumSrcElt) 1136333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner return ConstantExpr::getBitCast(C, DestTy); 114db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 1156b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner Type *SrcEltTy = C->getType()->getVectorElementType(); 116db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *DstEltTy = DestVTy->getElementType(); 117db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 118db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi // Otherwise, we're changing the number of elements in a vector, which 1196333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // requires endianness information to do the right thing. For example, 1206333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // bitcast (<2 x i64> <i64 0, i64 1> to <4 x i32>) 1216333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // folds to (little endian): 1226333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // <4 x i32> <i32 0, i32 0, i32 1, i32 0> 1236333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // and to (big endian): 1246333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // <4 x i32> <i32 0, i32 0, i32 0, i32 1> 125db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 1266333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // First thing is first. We only want to think about integer here, so if 1276333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // we have something in FP form, recast it as integer. 128b0bc6c361da9009e8414efde317d9bbff755f6c0Duncan Sands if (DstEltTy->isFloatingPointTy()) { 1296333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Fold to an vector of integers with same size as our FP type. 1306333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner unsigned FPWidth = DstEltTy->getPrimitiveSizeInBits(); 131db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *DestIVTy = 1326333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner VectorType::get(IntegerType::get(C->getContext(), FPWidth), NumDstElt); 1336333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Recursively handle this integer conversion, if possible. 1346333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner C = FoldBitCast(C, DestIVTy, TD); 135db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 136c2c50cdcdc19a1bca993c06d13d8cdca87083ce4Chandler Carruth // Finally, IR can handle this now that #elts line up. 1376333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner return ConstantExpr::getBitCast(C, DestTy); 1386333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner } 139db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 1406333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Okay, we know the destination is integer, if the input is FP, convert 1416333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // it to integer first. 142b0bc6c361da9009e8414efde317d9bbff755f6c0Duncan Sands if (SrcEltTy->isFloatingPointTy()) { 1436333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner unsigned FPWidth = SrcEltTy->getPrimitiveSizeInBits(); 144db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *SrcIVTy = 1456333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner VectorType::get(IntegerType::get(C->getContext(), FPWidth), NumSrcElt); 146c2c50cdcdc19a1bca993c06d13d8cdca87083ce4Chandler Carruth // Ask IR to do the conversion now that #elts line up. 1476333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner C = ConstantExpr::getBitCast(C, SrcIVTy); 148c2c50cdcdc19a1bca993c06d13d8cdca87083ce4Chandler Carruth // If IR wasn't able to fold it, bail out. 1496b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner if (!isa<ConstantVector>(C) && // FIXME: Remove ConstantVector. 1506b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner !isa<ConstantDataVector>(C)) 1516333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner return C; 1526333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner } 153db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 1546333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Now we know that the input and output vectors are both integer vectors 1556333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // of the same size, and that their #elements is not the same. Do the 1566333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // conversion here, which depends on whether the input or output has 1576333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // more elements. 1586333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner bool isLittleEndian = TD.isLittleEndian(); 159db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 1606333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner SmallVector<Constant*, 32> Result; 1616333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner if (NumDstElt < NumSrcElt) { 1626333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Handle: bitcast (<4 x i32> <i32 0, i32 1, i32 2, i32 3> to <2 x i64>) 1636333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner Constant *Zero = Constant::getNullValue(DstEltTy); 1646333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner unsigned Ratio = NumSrcElt/NumDstElt; 1656333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner unsigned SrcBitSize = SrcEltTy->getPrimitiveSizeInBits(); 1666333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner unsigned SrcElt = 0; 1676333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner for (unsigned i = 0; i != NumDstElt; ++i) { 1686333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Build each element of the result. 1696333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner Constant *Elt = Zero; 1706333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner unsigned ShiftAmt = isLittleEndian ? 0 : SrcBitSize*(Ratio-1); 1716333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner for (unsigned j = 0; j != Ratio; ++j) { 1726b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner Constant *Src =dyn_cast<ConstantInt>(C->getAggregateElement(SrcElt++)); 1736333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner if (!Src) // Reject constantexpr elements. 1746333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner return ConstantExpr::getBitCast(C, DestTy); 175db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 1766333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Zero extend the element to the right size. 1776333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner Src = ConstantExpr::getZExt(Src, Elt->getType()); 178db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 1796333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Shift it to the right place, depending on endianness. 180db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi Src = ConstantExpr::getShl(Src, 1816333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner ConstantInt::get(Src->getType(), ShiftAmt)); 1826333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner ShiftAmt += isLittleEndian ? SrcBitSize : -SrcBitSize; 183db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 1846333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Mix it in. 1856333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner Elt = ConstantExpr::getOr(Elt, Src); 1866333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner } 1876333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner Result.push_back(Elt); 1886333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner } 1896b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner return ConstantVector::get(Result); 1906b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner } 191db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 1926b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner // Handle: bitcast (<2 x i64> <i64 0, i64 1> to <4 x i32>) 1936b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner unsigned Ratio = NumDstElt/NumSrcElt; 1946b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner unsigned DstBitSize = DstEltTy->getPrimitiveSizeInBits(); 195db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 1966b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner // Loop over each source value, expanding into multiple results. 1976b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner for (unsigned i = 0; i != NumSrcElt; ++i) { 1986b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner Constant *Src = dyn_cast<ConstantInt>(C->getAggregateElement(i)); 1996b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner if (!Src) // Reject constantexpr elements. 2006b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner return ConstantExpr::getBitCast(C, DestTy); 201db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 2026b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner unsigned ShiftAmt = isLittleEndian ? 0 : DstBitSize*(Ratio-1); 2036b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner for (unsigned j = 0; j != Ratio; ++j) { 2046b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner // Shift the piece of the value into the right place, depending on 2056b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner // endianness. 206db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi Constant *Elt = ConstantExpr::getLShr(Src, 2076b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner ConstantInt::get(Src->getType(), ShiftAmt)); 2086b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner ShiftAmt += isLittleEndian ? DstBitSize : -DstBitSize; 209db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 2106b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner // Truncate and remember this piece. 2116b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner Result.push_back(ConstantExpr::getTrunc(Elt, DstEltTy)); 2126333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner } 2136333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner } 214db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 2152ca5c8644e6c35b3a7910a576ed89cddb7b82c3bChris Lattner return ConstantVector::get(Result); 2166333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner} 2176333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 2186333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 21903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// IsConstantOffsetFromGlobal - If this constant is actually a constant offset 22003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// from a global, return the global and the constant. Because of 22103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// constantexprs, this function is recursive. 22203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattnerstatic bool IsConstantOffsetFromGlobal(Constant *C, GlobalValue *&GV, 2231094b41c7b26089025822c5705b5c771f9b8cda4Benjamin Kramer APInt &Offset, const DataLayout &TD) { 22403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Trivial case, constant is the global. 22503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if ((GV = dyn_cast<GlobalValue>(C))) { 2261094b41c7b26089025822c5705b5c771f9b8cda4Benjamin Kramer Offset.clearAllBits(); 22703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return true; 22803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 229db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 23003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Otherwise, if this isn't a constant expr, bail out. 23103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner ConstantExpr *CE = dyn_cast<ConstantExpr>(C); 23203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (!CE) return false; 233db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 23403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Look through ptr->int and ptr->ptr casts. 23503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (CE->getOpcode() == Instruction::PtrToInt || 23603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner CE->getOpcode() == Instruction::BitCast) 23703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return IsConstantOffsetFromGlobal(CE->getOperand(0), GV, Offset, TD); 238db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 239db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi // i32* getelementptr ([5 x i32]* @a, i32 0, i32 5) 240cc00cc7e0427ab96a049703dd7b941eccdd4e7bdNuno Lopes if (GEPOperator *GEP = dyn_cast<GEPOperator>(CE)) { 24103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // If the base isn't a global+constant, we aren't either. 24203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (!IsConstantOffsetFromGlobal(CE->getOperand(0), GV, Offset, TD)) 24303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return false; 244db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 24503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Otherwise, add any offset that our operands provide. 246cc00cc7e0427ab96a049703dd7b941eccdd4e7bdNuno Lopes return GEP->accumulateConstantOffset(TD, Offset); 24703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 248db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 24903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return false; 25003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner} 25103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 252fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner/// ReadDataFromGlobal - Recursive helper to read bits out of global. C is the 253fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner/// constant being copied out of. ByteOffset is an offset into C. CurPtr is the 254fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner/// pointer to copy results into and BytesLeft is the number of bytes left in 255fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner/// the CurPtr buffer. TD is the target data. 256fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattnerstatic bool ReadDataFromGlobal(Constant *C, uint64_t ByteOffset, 257fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner unsigned char *CurPtr, unsigned BytesLeft, 2583574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow const DataLayout &TD) { 259fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner assert(ByteOffset <= TD.getTypeAllocSize(C->getType()) && 260fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner "Out of range access"); 261db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 262c7b1382e351249774be63bd73839e8a0671635e1Chris Lattner // If this element is zero or undefined, we can just return since *CurPtr is 263c7b1382e351249774be63bd73839e8a0671635e1Chris Lattner // zero initialized. 264fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (isa<ConstantAggregateZero>(C) || isa<UndefValue>(C)) 265fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return true; 266db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 267fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (ConstantInt *CI = dyn_cast<ConstantInt>(C)) { 268fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (CI->getBitWidth() > 64 || 269fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner (CI->getBitWidth() & 7) != 0) 270fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return false; 271db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 272fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner uint64_t Val = CI->getZExtValue(); 273fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner unsigned IntBytes = unsigned(CI->getBitWidth()/8); 274db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 275fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner for (unsigned i = 0; i != BytesLeft && ByteOffset != IntBytes; ++i) { 276562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi int n = ByteOffset; 277562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi if (!TD.isLittleEndian()) 278562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi n = IntBytes - n - 1; 279562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi CurPtr[i] = (unsigned char)(Val >> (n * 8)); 280fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner ++ByteOffset; 281fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 282fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return true; 283fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 284db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 285fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 286fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (CFP->getType()->isDoubleTy()) { 2876333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner C = FoldBitCast(C, Type::getInt64Ty(C->getContext()), TD); 288fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return ReadDataFromGlobal(C, ByteOffset, CurPtr, BytesLeft, TD); 289fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 290fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (CFP->getType()->isFloatTy()){ 2916333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner C = FoldBitCast(C, Type::getInt32Ty(C->getContext()), TD); 292fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return ReadDataFromGlobal(C, ByteOffset, CurPtr, BytesLeft, TD); 293fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 29442258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson if (CFP->getType()->isHalfTy()){ 29542258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson C = FoldBitCast(C, Type::getInt16Ty(C->getContext()), TD); 29642258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson return ReadDataFromGlobal(C, ByteOffset, CurPtr, BytesLeft, TD); 29742258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson } 298c7b1382e351249774be63bd73839e8a0671635e1Chris Lattner return false; 299fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 300db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 301fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) { 302fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner const StructLayout *SL = TD.getStructLayout(CS->getType()); 303fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner unsigned Index = SL->getElementContainingOffset(ByteOffset); 304fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner uint64_t CurEltOffset = SL->getElementOffset(Index); 305fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner ByteOffset -= CurEltOffset; 306db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 307fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner while (1) { 308fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // If the element access is to the element itself and not to tail padding, 309fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // read the bytes from the element. 310fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner uint64_t EltSize = TD.getTypeAllocSize(CS->getOperand(Index)->getType()); 311fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 312fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (ByteOffset < EltSize && 313fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner !ReadDataFromGlobal(CS->getOperand(Index), ByteOffset, CurPtr, 314fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner BytesLeft, TD)) 315fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return false; 316db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 317fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner ++Index; 318db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 319fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // Check to see if we read from the last struct element, if so we're done. 320fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (Index == CS->getType()->getNumElements()) 321fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return true; 322fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 323fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // If we read all of the bytes we needed from this element we're done. 324fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner uint64_t NextEltOffset = SL->getElementOffset(Index); 325fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 326fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (BytesLeft <= NextEltOffset-CurEltOffset-ByteOffset) 327fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return true; 328fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 329fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // Move to the next element of the struct. 330c5af649758ac8c6ffb896d7d5c570640a9fa1deeChris Lattner CurPtr += NextEltOffset-CurEltOffset-ByteOffset; 331fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner BytesLeft -= NextEltOffset-CurEltOffset-ByteOffset; 332fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner ByteOffset = 0; 333fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner CurEltOffset = NextEltOffset; 334fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 335fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // not reached. 336fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 337fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 338a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner if (isa<ConstantArray>(C) || isa<ConstantVector>(C) || 339a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner isa<ConstantDataSequential>(C)) { 340a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner Type *EltTy = cast<SequentialType>(C->getType())->getElementType(); 341a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner uint64_t EltSize = TD.getTypeAllocSize(EltTy); 342fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner uint64_t Index = ByteOffset / EltSize; 343fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner uint64_t Offset = ByteOffset - Index * EltSize; 344a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner uint64_t NumElts; 345a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner if (ArrayType *AT = dyn_cast<ArrayType>(C->getType())) 346a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner NumElts = AT->getNumElements(); 347a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner else 348a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner NumElts = cast<VectorType>(C->getType())->getNumElements(); 349f2124cc6c1d4e675526e87bcc9fccd3ef4664dcbDuncan Sands 350a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner for (; Index != NumElts; ++Index) { 351a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner if (!ReadDataFromGlobal(C->getAggregateElement(Index), Offset, CurPtr, 352fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner BytesLeft, TD)) 353fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return false; 354f2124cc6c1d4e675526e87bcc9fccd3ef4664dcbDuncan Sands 355f2124cc6c1d4e675526e87bcc9fccd3ef4664dcbDuncan Sands uint64_t BytesWritten = EltSize - Offset; 356f2124cc6c1d4e675526e87bcc9fccd3ef4664dcbDuncan Sands assert(BytesWritten <= EltSize && "Not indexing into this element?"); 357f2124cc6c1d4e675526e87bcc9fccd3ef4664dcbDuncan Sands if (BytesWritten >= BytesLeft) 358fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return true; 359f2124cc6c1d4e675526e87bcc9fccd3ef4664dcbDuncan Sands 360fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner Offset = 0; 361f2124cc6c1d4e675526e87bcc9fccd3ef4664dcbDuncan Sands BytesLeft -= BytesWritten; 362f2124cc6c1d4e675526e87bcc9fccd3ef4664dcbDuncan Sands CurPtr += BytesWritten; 363fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 364fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return true; 365fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 366db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 3676475d9434ff3e981160f85d3f1aa07c9e0ace6f2Anders Carlsson if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 3685d43ff4e7ea30eaf5a1c417f0ec528900f5c83f2Anders Carlsson if (CE->getOpcode() == Instruction::IntToPtr && 369db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi CE->getOperand(0)->getType() == TD.getIntPtrType(CE->getContext())) 370db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi return ReadDataFromGlobal(CE->getOperand(0), ByteOffset, CurPtr, 371a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner BytesLeft, TD); 3726475d9434ff3e981160f85d3f1aa07c9e0ace6f2Anders Carlsson } 3736475d9434ff3e981160f85d3f1aa07c9e0ace6f2Anders Carlsson 374fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // Otherwise, unknown initializer type. 375fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return false; 376fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner} 377fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 378fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattnerstatic Constant *FoldReinterpretLoadFromConstPtr(Constant *C, 3793574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow const DataLayout &TD) { 380db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *LoadTy = cast<PointerType>(C->getType())->getElementType(); 381db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner IntegerType *IntType = dyn_cast<IntegerType>(LoadTy); 382db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 383fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // If this isn't an integer load we can't fold it directly. 384fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (!IntType) { 385fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // If this is a float/double load, we can try folding it as an int32/64 load 38617f0cd3cc1432231f2bc5601e7e463986a59d817Chris Lattner // and then bitcast the result. This can be useful for union cases. Note 38717f0cd3cc1432231f2bc5601e7e463986a59d817Chris Lattner // that address spaces don't matter here since we're not going to result in 38817f0cd3cc1432231f2bc5601e7e463986a59d817Chris Lattner // an actual new load. 389db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *MapTy; 39042258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson if (LoadTy->isHalfTy()) 39142258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson MapTy = Type::getInt16PtrTy(C->getContext()); 39242258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson else if (LoadTy->isFloatTy()) 393fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner MapTy = Type::getInt32PtrTy(C->getContext()); 39417f0cd3cc1432231f2bc5601e7e463986a59d817Chris Lattner else if (LoadTy->isDoubleTy()) 395fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner MapTy = Type::getInt64PtrTy(C->getContext()); 3961df9859c40492511b8aa4321eb76496005d3b75bDuncan Sands else if (LoadTy->isVectorTy()) { 39717f0cd3cc1432231f2bc5601e7e463986a59d817Chris Lattner MapTy = IntegerType::get(C->getContext(), 39817f0cd3cc1432231f2bc5601e7e463986a59d817Chris Lattner TD.getTypeAllocSizeInBits(LoadTy)); 39917f0cd3cc1432231f2bc5601e7e463986a59d817Chris Lattner MapTy = PointerType::getUnqual(MapTy); 40017f0cd3cc1432231f2bc5601e7e463986a59d817Chris Lattner } else 401fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return 0; 402fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 4036333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner C = FoldBitCast(C, MapTy, TD); 404fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (Constant *Res = FoldReinterpretLoadFromConstPtr(C, TD)) 4056333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner return FoldBitCast(Res, LoadTy, TD); 406fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return 0; 407fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 408db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 409fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner unsigned BytesLoaded = (IntType->getBitWidth() + 7) / 8; 410739208a790398cf1f9da05149c768371e48781e8Chris Lattner if (BytesLoaded > 32 || BytesLoaded == 0) return 0; 411db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 412fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner GlobalValue *GVal; 4131094b41c7b26089025822c5705b5c771f9b8cda4Benjamin Kramer APInt Offset(TD.getPointerSizeInBits(), 0); 414fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (!IsConstantOffsetFromGlobal(C, GVal, Offset, TD)) 415fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return 0; 416db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 417fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner GlobalVariable *GV = dyn_cast<GlobalVariable>(GVal); 418c7b1382e351249774be63bd73839e8a0671635e1Chris Lattner if (!GV || !GV->isConstant() || !GV->hasDefinitiveInitializer() || 419fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner !GV->getInitializer()->getType()->isSized()) 420fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return 0; 421fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 422fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // If we're loading off the beginning of the global, some bytes may be valid, 423fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // but we don't try to handle this. 4241094b41c7b26089025822c5705b5c771f9b8cda4Benjamin Kramer if (Offset.isNegative()) return 0; 425db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 426fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // If we're not accessing anything in this constant, the result is undefined. 4271094b41c7b26089025822c5705b5c771f9b8cda4Benjamin Kramer if (Offset.getZExtValue() >= 4281094b41c7b26089025822c5705b5c771f9b8cda4Benjamin Kramer TD.getTypeAllocSize(GV->getInitializer()->getType())) 429fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return UndefValue::get(IntType); 430db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 431739208a790398cf1f9da05149c768371e48781e8Chris Lattner unsigned char RawBytes[32] = {0}; 4321094b41c7b26089025822c5705b5c771f9b8cda4Benjamin Kramer if (!ReadDataFromGlobal(GV->getInitializer(), Offset.getZExtValue(), RawBytes, 433fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner BytesLoaded, TD)) 434fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return 0; 435fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 436562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi APInt ResultVal = APInt(IntType->getBitWidth(), 0); 437562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi if (TD.isLittleEndian()) { 438562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi ResultVal = RawBytes[BytesLoaded - 1]; 439562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi for (unsigned i = 1; i != BytesLoaded; ++i) { 440562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi ResultVal <<= 8; 441562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi ResultVal |= RawBytes[BytesLoaded-1-i]; 442562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi } 443562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi } else { 444562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi ResultVal = RawBytes[0]; 445562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi for (unsigned i = 1; i != BytesLoaded; ++i) { 446562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi ResultVal <<= 8; 447562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi ResultVal |= RawBytes[i]; 448562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi } 449739208a790398cf1f9da05149c768371e48781e8Chris Lattner } 450fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 451739208a790398cf1f9da05149c768371e48781e8Chris Lattner return ConstantInt::get(IntType->getContext(), ResultVal); 452fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner} 453fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 454878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner/// ConstantFoldLoadFromConstPtr - Return the value that a load from C would 455878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner/// produce if it is constant and determinable. If this is not determinable, 456878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner/// return null. 457878e4946700824954d7eb7f3ff660353db8e0d17Chris LattnerConstant *llvm::ConstantFoldLoadFromConstPtr(Constant *C, 4583574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow const DataLayout *TD) { 459878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner // First, try the easy cases: 460878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) 461878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner if (GV->isConstant() && GV->hasDefinitiveInitializer()) 462878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner return GV->getInitializer(); 463878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner 464e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner // If the loaded value isn't a constant expr, we can't handle it. 465e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner ConstantExpr *CE = dyn_cast<ConstantExpr>(C); 466e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner if (!CE) return 0; 467db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 468e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner if (CE->getOpcode() == Instruction::GetElementPtr) { 469e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner if (GlobalVariable *GV = dyn_cast<GlobalVariable>(CE->getOperand(0))) 470e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner if (GV->isConstant() && GV->hasDefinitiveInitializer()) 471db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi if (Constant *V = 472e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner ConstantFoldLoadThroughGEPConstantExpr(GV->getInitializer(), CE)) 473e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner return V; 474e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner } 475db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 476e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner // Instead of loading constant c string, use corresponding integer value 477e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner // directly if string length is small enough. 47818c7f80b3e83ab584bd8572695a3cde8bafd9d3cChris Lattner StringRef Str; 47918c7f80b3e83ab584bd8572695a3cde8bafd9d3cChris Lattner if (TD && getConstantStringInfo(CE, Str) && !Str.empty()) { 48018c7f80b3e83ab584bd8572695a3cde8bafd9d3cChris Lattner unsigned StrLen = Str.size(); 481db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *Ty = cast<PointerType>(CE->getType())->getElementType(); 482fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner unsigned NumBits = Ty->getPrimitiveSizeInBits(); 483eae2895120500d06bf6de9725efeeff498f60385Chris Lattner // Replace load with immediate integer if the result is an integer or fp 484eae2895120500d06bf6de9725efeeff498f60385Chris Lattner // value. 485eae2895120500d06bf6de9725efeeff498f60385Chris Lattner if ((NumBits >> 3) == StrLen + 1 && (NumBits & 7) == 0 && 486490b8f5d64823d998fc12ad3a91ecacd82c1901eChandler Carruth (isa<IntegerType>(Ty) || Ty->isFloatingPointTy())) { 487fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner APInt StrVal(NumBits, 0); 488fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner APInt SingleChar(NumBits, 0); 489e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner if (TD->isLittleEndian()) { 490fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner for (signed i = StrLen-1; i >= 0; i--) { 491e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner SingleChar = (uint64_t) Str[i] & UCHAR_MAX; 49262d327e241f59735eed836e98c8f11ffaa6cf6f8Chris Lattner StrVal = (StrVal << 8) | SingleChar; 49362d327e241f59735eed836e98c8f11ffaa6cf6f8Chris Lattner } 494e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner } else { 495fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner for (unsigned i = 0; i < StrLen; i++) { 496e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner SingleChar = (uint64_t) Str[i] & UCHAR_MAX; 497e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner StrVal = (StrVal << 8) | SingleChar; 498e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner } 499e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner // Append NULL at the end. 500e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner SingleChar = 0; 501e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner StrVal = (StrVal << 8) | SingleChar; 50262d327e241f59735eed836e98c8f11ffaa6cf6f8Chris Lattner } 503db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 504eae2895120500d06bf6de9725efeeff498f60385Chris Lattner Constant *Res = ConstantInt::get(CE->getContext(), StrVal); 505eae2895120500d06bf6de9725efeeff498f60385Chris Lattner if (Ty->isFloatingPointTy()) 506eae2895120500d06bf6de9725efeeff498f60385Chris Lattner Res = ConstantExpr::getBitCast(Res, Ty); 507eae2895120500d06bf6de9725efeeff498f60385Chris Lattner return Res; 50862d327e241f59735eed836e98c8f11ffaa6cf6f8Chris Lattner } 509878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner } 510db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 511e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner // If this load comes from anywhere in a constant global, and if the global 512e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner // is all undef or zero, we know what it loads. 513bd1801b5553c8be3960255a92738464e0010b6f6Dan Gohman if (GlobalVariable *GV = 514bd1801b5553c8be3960255a92738464e0010b6f6Dan Gohman dyn_cast<GlobalVariable>(GetUnderlyingObject(CE, TD))) { 515e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner if (GV->isConstant() && GV->hasDefinitiveInitializer()) { 516db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *ResTy = cast<PointerType>(C->getType())->getElementType(); 517e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner if (GV->getInitializer()->isNullValue()) 518e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner return Constant::getNullValue(ResTy); 519e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner if (isa<UndefValue>(GV->getInitializer())) 520e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner return UndefValue::get(ResTy); 521e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner } 522e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner } 523db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 524562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi // Try hard to fold loads from bitcasted strange and non-type-safe things. 525562b1d883f304e52b237e0af2ff7e4a9e02100cdNAKAMURA Takumi if (TD) 526fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return FoldReinterpretLoadFromConstPtr(CE, *TD); 527878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner return 0; 528878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner} 529878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner 5303574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmowstatic Constant *ConstantFoldLoadInst(const LoadInst *LI, const DataLayout *TD){ 531878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner if (LI->isVolatile()) return 0; 532db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 533878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner if (Constant *C = dyn_cast<Constant>(LI->getOperand(0))) 534878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner return ConstantFoldLoadFromConstPtr(C, TD); 535fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 536878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner return 0; 537878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner} 53803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 53903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// SymbolicallyEvaluateBinop - One of Op0/Op1 is a constant expression. 54067e3566d8f6875e9c92d224f493023408a66227eNick Lewycky/// Attempt to symbolically evaluate the result of a binary operator merging 5419d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky/// these together. If target data info is available, it is provided as DL, 5429d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky/// otherwise DL is null. 54303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattnerstatic Constant *SymbolicallyEvaluateBinop(unsigned Opc, Constant *Op0, 5449d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky Constant *Op1, const DataLayout *DL){ 54503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // SROA 546db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 54703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Fold (and 0xffffffff00000000, (shl x, 32)) -> shl. 54803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Fold (lshr (or X, Y), 32) -> (lshr [X/Y], 32) if one doesn't contribute 54903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // bits. 550db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 551db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 5529d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky if (Opc == Instruction::And && DL) { 5539d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky unsigned BitWidth = DL->getTypeSizeInBits(Op0->getType()); 5549d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky APInt KnownZero0(BitWidth, 0), KnownOne0(BitWidth, 0); 5559d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky APInt KnownZero1(BitWidth, 0), KnownOne1(BitWidth, 0); 5569d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky ComputeMaskedBits(Op0, KnownZero0, KnownOne0, DL); 5579d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky ComputeMaskedBits(Op1, KnownZero1, KnownOne1, DL); 5589d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky if ((KnownOne1 | KnownZero0).isAllOnesValue()) { 5599d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky // All the bits of Op0 that the 'and' could be masking are already zero. 5609d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky return Op0; 5619d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky } 5629d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky if ((KnownOne0 | KnownZero1).isAllOnesValue()) { 5639d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky // All the bits of Op1 that the 'and' could be masking are already zero. 5649d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky return Op1; 5659d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky } 5669d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky 5679d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky APInt KnownZero = KnownZero0 | KnownZero1; 5689d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky APInt KnownOne = KnownOne0 & KnownOne1; 5699d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky if ((KnownZero | KnownOne).isAllOnesValue()) { 5709d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky return ConstantInt::get(Op0->getType(), KnownOne); 5719d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky } 5729d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky } 5739d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky 57403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // If the constant expr is something like &A[123] - &A[4].f, fold this into a 57503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // constant. This happens frequently when iterating over a global array. 5769d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky if (Opc == Instruction::Sub && DL) { 57703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner GlobalValue *GV1, *GV2; 5789d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky unsigned PtrSize = DL->getPointerSizeInBits(); 5799d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky unsigned OpSize = DL->getTypeSizeInBits(Op0->getType()); 580faf601ee936a440027447fa11ef400cf53bc1acfBenjamin Kramer APInt Offs1(PtrSize, 0), Offs2(PtrSize, 0); 581db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 5829d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky if (IsConstantOffsetFromGlobal(Op0, GV1, Offs1, *DL)) 5839d90163bc31b71bb20b4423f3254544134d31ea2Nick Lewycky if (IsConstantOffsetFromGlobal(Op1, GV2, Offs2, *DL) && 58403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner GV1 == GV2) { 58503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // (&GV+C1) - (&GV+C2) -> C1-C2, pointer arithmetic cannot overflow. 586faf601ee936a440027447fa11ef400cf53bc1acfBenjamin Kramer // PtrToInt may change the bitwidth so we have convert to the right size 587faf601ee936a440027447fa11ef400cf53bc1acfBenjamin Kramer // first. 588faf601ee936a440027447fa11ef400cf53bc1acfBenjamin Kramer return ConstantInt::get(Op0->getType(), Offs1.zextOrTrunc(OpSize) - 589faf601ee936a440027447fa11ef400cf53bc1acfBenjamin Kramer Offs2.zextOrTrunc(OpSize)); 59003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 59103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 592db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 59303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return 0; 59403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner} 59503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 5964f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman/// CastGEPIndices - If array indices are not pointer-sized integers, 5974f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman/// explicitly cast them so that they aren't implicitly casted by the 5984f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman/// getelementptr. 5991d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foadstatic Constant *CastGEPIndices(ArrayRef<Constant *> Ops, 6003574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow Type *ResultTy, const DataLayout *TD, 601618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier const TargetLibraryInfo *TLI) { 6024f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman if (!TD) return 0; 603ece6c6bb6329748b92403c06ac87f45c43485911Chandler Carruth Type *IntPtrTy = TD->getIntPtrType(ResultTy->getContext()); 6044f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman 6054f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman bool Any = false; 6064f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman SmallVector<Constant*, 32> NewIdxs; 6071d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foad for (unsigned i = 1, e = Ops.size(); i != e; ++i) { 6084f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman if ((i == 1 || 6094f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman !isa<StructType>(GetElementPtrInst::getIndexedType(Ops[0]->getType(), 610a9203109f4ac95aa7e9624f2838e3d89623ec902Jay Foad Ops.slice(1, i-1)))) && 6114f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman Ops[i]->getType() != IntPtrTy) { 6124f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman Any = true; 6134f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman NewIdxs.push_back(ConstantExpr::getCast(CastInst::getCastOpcode(Ops[i], 6144f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman true, 6154f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman IntPtrTy, 6164f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman true), 6174f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman Ops[i], IntPtrTy)); 6184f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman } else 6194f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman NewIdxs.push_back(Ops[i]); 6204f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman } 6214f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman if (!Any) return 0; 6224f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman 6234f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman Constant *C = 624dab3d29605a5c83db41b28176273ef55961120c1Jay Foad ConstantExpr::getGetElementPtr(Ops[0], NewIdxs); 6254f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) 626618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier if (Constant *Folded = ConstantFoldConstantExpression(CE, TD, TLI)) 6274f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman C = Folded; 6284f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman return C; 6294f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman} 6304f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman 63197baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem/// Strip the pointer casts, but preserve the address space information. 63297baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotemstatic Constant* StripPtrCastKeepAS(Constant* Ptr) { 63397baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem assert(Ptr->getType()->isPointerTy() && "Not a pointer type"); 63497baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem PointerType *OldPtrTy = cast<PointerType>(Ptr->getType()); 63597baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem Ptr = cast<Constant>(Ptr->stripPointerCasts()); 63697baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem PointerType *NewPtrTy = cast<PointerType>(Ptr->getType()); 63797baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem 63897baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem // Preserve the address space number of the pointer. 63997baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem if (NewPtrTy->getAddressSpace() != OldPtrTy->getAddressSpace()) { 64097baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem NewPtrTy = NewPtrTy->getElementType()->getPointerTo( 64197baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem OldPtrTy->getAddressSpace()); 64297baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem Ptr = ConstantExpr::getBitCast(Ptr, NewPtrTy); 64397baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem } 64497baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem return Ptr; 64597baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem} 64697baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem 64703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// SymbolicallyEvaluateGEP - If we can symbolically evaluate the specified GEP 64803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// constant expression, do so. 6491d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foadstatic Constant *SymbolicallyEvaluateGEP(ArrayRef<Constant *> Ops, 6503574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow Type *ResultTy, const DataLayout *TD, 651618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier const TargetLibraryInfo *TLI) { 65203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner Constant *Ptr = Ops[0]; 6531608769abeb1430dc34f31ffac0d9850f99ae36aNadav Rotem if (!TD || !cast<PointerType>(Ptr->getType())->getElementType()->isSized() || 6541608769abeb1430dc34f31ffac0d9850f99ae36aNadav Rotem !Ptr->getType()->isPointerTy()) 65503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return 0; 656db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 657ece6c6bb6329748b92403c06ac87f45c43485911Chandler Carruth Type *IntPtrTy = TD->getIntPtrType(Ptr->getContext()); 658268e7d7a9446bb89b80472cdb7b9803f16c0191eChris Lattner 659268e7d7a9446bb89b80472cdb7b9803f16c0191eChris Lattner // If this is a constant expr gep that is effectively computing an 660268e7d7a9446bb89b80472cdb7b9803f16c0191eChris Lattner // "offsetof", fold it into 'cast int Size to T*' instead of 'gep 0, 0, 12' 6611d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foad for (unsigned i = 1, e = Ops.size(); i != e; ++i) 6628cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner if (!isa<ConstantInt>(Ops[i])) { 663db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 6648cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner // If this is "gep i8* Ptr, (sub 0, V)", fold this as: 6658cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner // "inttoptr (sub (ptrtoint Ptr), V)" 6661d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foad if (Ops.size() == 2 && 6678cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner cast<PointerType>(ResultTy)->getElementType()->isIntegerTy(8)) { 6688cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner ConstantExpr *CE = dyn_cast<ConstantExpr>(Ops[1]); 669156eb0a569a1ebac86ad8438645f690d8a3894c4Chris Lattner assert((CE == 0 || CE->getType() == IntPtrTy) && 670f1cadf28991b2643128bfe38990ff235f2cb1491Chris Lattner "CastGEPIndices didn't canonicalize index types!"); 6718cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner if (CE && CE->getOpcode() == Instruction::Sub && 672f1cadf28991b2643128bfe38990ff235f2cb1491Chris Lattner CE->getOperand(0)->isNullValue()) { 6738cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner Constant *Res = ConstantExpr::getPtrToInt(Ptr, CE->getType()); 6748cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner Res = ConstantExpr::getSub(Res, CE->getOperand(1)); 6758cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner Res = ConstantExpr::getIntToPtr(Res, ResultTy); 6768cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner if (ConstantExpr *ResCE = dyn_cast<ConstantExpr>(Res)) 677618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier Res = ConstantFoldConstantExpression(ResCE, TD, TLI); 6788cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner return Res; 6798cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner } 6808cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner } 681de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman return 0; 6828cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner } 68397baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem 684f1cadf28991b2643128bfe38990ff235f2cb1491Chris Lattner unsigned BitWidth = TD->getTypeSizeInBits(IntPtrTy); 6858fbbb3980755d74539a0aed02bc18842ed2bd18dJay Foad APInt Offset = 6868fbbb3980755d74539a0aed02bc18842ed2bd18dJay Foad APInt(BitWidth, TD->getIndexedOffset(Ptr->getType(), 6875177b3a8c48adec2acf284fcb8e00775a705a7e2Roman Divacky makeArrayRef((Value *const*) 6885177b3a8c48adec2acf284fcb8e00775a705a7e2Roman Divacky Ops.data() + 1, 6898fbbb3980755d74539a0aed02bc18842ed2bd18dJay Foad Ops.size() - 1))); 69097baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem Ptr = StripPtrCastKeepAS(Ptr); 6910891d752a68a25025ffc3339aab1f0ad3221b0edDan Gohman 6920891d752a68a25025ffc3339aab1f0ad3221b0edDan Gohman // If this is a GEP of a GEP, fold it all into a single GEP. 6930891d752a68a25025ffc3339aab1f0ad3221b0edDan Gohman while (GEPOperator *GEP = dyn_cast<GEPOperator>(Ptr)) { 6940891d752a68a25025ffc3339aab1f0ad3221b0edDan Gohman SmallVector<Value *, 4> NestedOps(GEP->op_begin()+1, GEP->op_end()); 695890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands 696890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands // Do not try the incorporate the sub-GEP if some index is not a number. 697890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands bool AllConstantInt = true; 698890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands for (unsigned i = 0, e = NestedOps.size(); i != e; ++i) 699890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands if (!isa<ConstantInt>(NestedOps[i])) { 700890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands AllConstantInt = false; 701890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands break; 702890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands } 703890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands if (!AllConstantInt) 704890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands break; 705890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands 7060891d752a68a25025ffc3339aab1f0ad3221b0edDan Gohman Ptr = cast<Constant>(GEP->getOperand(0)); 7070891d752a68a25025ffc3339aab1f0ad3221b0edDan Gohman Offset += APInt(BitWidth, 7088fbbb3980755d74539a0aed02bc18842ed2bd18dJay Foad TD->getIndexedOffset(Ptr->getType(), NestedOps)); 70997baaeaeb22e7336590b8745bd181425ca410cb5Nadav Rotem Ptr = StripPtrCastKeepAS(Ptr); 7100891d752a68a25025ffc3339aab1f0ad3221b0edDan Gohman } 7110891d752a68a25025ffc3339aab1f0ad3221b0edDan Gohman 712de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman // If the base value for this address is a literal integer value, fold the 713de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman // getelementptr to the resulting integer value casted to the pointer type. 71440b037ef611efc5c43ffc43a911d0eb57e0d444dDan Gohman APInt BasePtr(BitWidth, 0); 71540b037ef611efc5c43ffc43a911d0eb57e0d444dDan Gohman if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ptr)) 71640b037ef611efc5c43ffc43a911d0eb57e0d444dDan Gohman if (CE->getOpcode() == Instruction::IntToPtr) 71740f8f6264d5af2c38e797e0dc59827cd231e8ff7Jay Foad if (ConstantInt *Base = dyn_cast<ConstantInt>(CE->getOperand(0))) 71840f8f6264d5af2c38e797e0dc59827cd231e8ff7Jay Foad BasePtr = Base->getValue().zextOrTrunc(BitWidth); 71940b037ef611efc5c43ffc43a911d0eb57e0d444dDan Gohman if (Ptr->isNullValue() || BasePtr != 0) { 7207b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner Constant *C = ConstantInt::get(Ptr->getContext(), Offset+BasePtr); 721de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman return ConstantExpr::getIntToPtr(C, ResultTy); 722de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman } 723de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman 724de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman // Otherwise form a regular getelementptr. Recompute the indices so that 725de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman // we eliminate over-indexing of the notional static type array bounds. 726de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman // This makes it easy to determine if the getelementptr is "inbounds". 727de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman // Also, this helps GlobalOpt do SROA on GlobalVariables. 728db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *Ty = Ptr->getType(); 7297362ac7f8cc803708187fd6029de9f8f62ff2ed2Chandler Carruth assert(Ty->isPointerTy() && "Forming regular GEP of non-pointer type"); 730de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman SmallVector<Constant*, 32> NewIdxs; 7313d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman do { 732db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner if (SequentialType *ATy = dyn_cast<SequentialType>(Ty)) { 7331df9859c40492511b8aa4321eb76496005d3b75bDuncan Sands if (ATy->isPointerTy()) { 734e568fa2d29c58aaedcaa832f805949d5e4371b4bChris Lattner // The only pointer indexing we'll do is on the first index of the GEP. 735e568fa2d29c58aaedcaa832f805949d5e4371b4bChris Lattner if (!NewIdxs.empty()) 736e568fa2d29c58aaedcaa832f805949d5e4371b4bChris Lattner break; 737db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 738e568fa2d29c58aaedcaa832f805949d5e4371b4bChris Lattner // Only handle pointers to sized types, not pointers to functions. 739e568fa2d29c58aaedcaa832f805949d5e4371b4bChris Lattner if (!ATy->getElementType()->isSized()) 740e568fa2d29c58aaedcaa832f805949d5e4371b4bChris Lattner return 0; 741e568fa2d29c58aaedcaa832f805949d5e4371b4bChris Lattner } 742db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 743de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman // Determine which element of the array the offset points into. 744cda9706cb74a65d2feb2175613cb0fe46acc5aa2Dan Gohman APInt ElemSize(BitWidth, TD->getTypeAllocSize(ATy->getElementType())); 745ece6c6bb6329748b92403c06ac87f45c43485911Chandler Carruth IntegerType *IntPtrTy = TD->getIntPtrType(Ty->getContext()); 746de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman if (ElemSize == 0) 747c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner // The element size is 0. This may be [0 x Ty]*, so just use a zero 748e58391073f6e17cd1024f737618a6f6b8d1323ceDuncan Sands // index for this level and proceed to the next level to see if it can 749e58391073f6e17cd1024f737618a6f6b8d1323ceDuncan Sands // accommodate the offset. 750c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner NewIdxs.push_back(ConstantInt::get(IntPtrTy, 0)); 751c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner else { 752c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner // The element size is non-zero divide the offset by the element 753c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner // size (rounding down), to compute the index at this level. 754c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner APInt NewIdx = Offset.udiv(ElemSize); 755c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner Offset -= NewIdx * ElemSize; 756c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner NewIdxs.push_back(ConstantInt::get(IntPtrTy, NewIdx)); 757c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner } 758de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman Ty = ATy->getElementType(); 759db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner } else if (StructType *STy = dyn_cast<StructType>(Ty)) { 7607362ac7f8cc803708187fd6029de9f8f62ff2ed2Chandler Carruth // If we end up with an offset that isn't valid for this struct type, we 7617362ac7f8cc803708187fd6029de9f8f62ff2ed2Chandler Carruth // can't re-form this GEP in a regular form, so bail out. The pointer 7627362ac7f8cc803708187fd6029de9f8f62ff2ed2Chandler Carruth // operand likely went through casts that are necessary to make the GEP 7637362ac7f8cc803708187fd6029de9f8f62ff2ed2Chandler Carruth // sensible. 764de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman const StructLayout &SL = *TD->getStructLayout(STy); 7657362ac7f8cc803708187fd6029de9f8f62ff2ed2Chandler Carruth if (Offset.uge(SL.getSizeInBytes())) 7667362ac7f8cc803708187fd6029de9f8f62ff2ed2Chandler Carruth break; 7677362ac7f8cc803708187fd6029de9f8f62ff2ed2Chandler Carruth 7687362ac7f8cc803708187fd6029de9f8f62ff2ed2Chandler Carruth // Determine which field of the struct the offset points into. The 7697362ac7f8cc803708187fd6029de9f8f62ff2ed2Chandler Carruth // getZExtValue is fine as we've already ensured that the offset is 7707362ac7f8cc803708187fd6029de9f8f62ff2ed2Chandler Carruth // within the range representable by the StructLayout API. 771cda9706cb74a65d2feb2175613cb0fe46acc5aa2Dan Gohman unsigned ElIdx = SL.getElementContainingOffset(Offset.getZExtValue()); 7727b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner NewIdxs.push_back(ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 7737b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner ElIdx)); 774cda9706cb74a65d2feb2175613cb0fe46acc5aa2Dan Gohman Offset -= APInt(BitWidth, SL.getElementOffset(ElIdx)); 775de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman Ty = STy->getTypeAtIndex(ElIdx); 776de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman } else { 7773d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman // We've reached some non-indexable type. 7783d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman break; 779de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman } 7803d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman } while (Ty != cast<PointerType>(ResultTy)->getElementType()); 7813d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman 7823d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman // If we haven't used up the entire offset by descending the static 7833d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman // type, then the offset is pointing into the middle of an indivisible 7843d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman // member, so we can't simplify it. 7853d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman if (Offset != 0) 7863d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman return 0; 787de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman 7883bfbc4587a7e79f08f8c126a9e62c3475fb90f8bDan Gohman // Create a GEP. 7893bfbc4587a7e79f08f8c126a9e62c3475fb90f8bDan Gohman Constant *C = 790dab3d29605a5c83db41b28176273ef55961120c1Jay Foad ConstantExpr::getGetElementPtr(Ptr, NewIdxs); 7916e7ad958683f34bf6c014c88fef723e5a2d741beDan Gohman assert(cast<PointerType>(C->getType())->getElementType() == Ty && 7926e7ad958683f34bf6c014c88fef723e5a2d741beDan Gohman "Computed GetElementPtr has unexpected type!"); 7933d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman 7943d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman // If we ended up indexing a member with a type that doesn't match 7954c0d5d5db876b0628bdf6a2174263a1c0a9130e2Dan Gohman // the type of what the original indices indexed, add a cast. 7963d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman if (Ty != cast<PointerType>(ResultTy)->getElementType()) 7976333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner C = FoldBitCast(C, ResultTy, *TD); 798de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman 7993d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman return C; 80003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner} 80103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 8021afab9c1e0ae2d145ce01718aa14065393117e70Chris Lattner 80303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 80403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner//===----------------------------------------------------------------------===// 80503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner// Constant Folding public APIs 80603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner//===----------------------------------------------------------------------===// 80703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 808b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands/// ConstantFoldInstruction - Try to constant fold the specified instruction. 809b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands/// If successful, the constant result is returned, if not, null is returned. 810b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands/// Note that this fails if not all of the operands are constant. Otherwise, 811b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands/// this function can only fail when attempting to fold instructions like loads 812b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands/// and stores, which have no constant expression form. 813618c1dbd293d15ee19f61b1156ab8086ad28311aChad RosierConstant *llvm::ConstantFoldInstruction(Instruction *I, 8143574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow const DataLayout *TD, 815618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier const TargetLibraryInfo *TLI) { 816b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands // Handle PHI nodes quickly here... 8175520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (PHINode *PN = dyn_cast<PHINode>(I)) { 818c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands Constant *CommonValue = 0; 819c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands 820c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) { 821c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands Value *Incoming = PN->getIncomingValue(i); 822b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands // If the incoming value is undef then skip it. Note that while we could 823b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands // skip the value if it is equal to the phi node itself we choose not to 824b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands // because that would break the rule that constant folding only applies if 825b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands // all operands are constants. 826b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands if (isa<UndefValue>(Incoming)) 827c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands continue; 82803e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman // If the incoming value is not a constant, then give up. 829c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands Constant *C = dyn_cast<Constant>(Incoming); 83003e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman if (!C) 83103e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman return 0; 83203e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman // Fold the PHI's operands. 83303e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman if (ConstantExpr *NewC = dyn_cast<ConstantExpr>(C)) 83403e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman C = ConstantFoldConstantExpression(NewC, TD, TLI); 83503e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman // If the incoming value is a different constant to 83603e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman // the one we saw previously, then give up. 83703e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman if (CommonValue && C != CommonValue) 838c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands return 0; 839c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands CommonValue = C; 840c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands } 8415520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 84203e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman 843c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands // If we reach here, all incoming values are the same constant or undef. 844c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands return CommonValue ? CommonValue : UndefValue::get(PN->getType()); 8455520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner } 8465520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 8475520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner // Scan the operand list, checking to see if they are all constants, if so, 8485520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner // hand off to ConstantFoldInstOperands. 8495520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner SmallVector<Constant*, 8> Ops; 85003e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman for (User::op_iterator i = I->op_begin(), e = I->op_end(); i != e; ++i) { 85103e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman Constant *Op = dyn_cast<Constant>(*i); 85203e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman if (!Op) 8535520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return 0; // All operands not constant! 8545520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 85503e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman // Fold the Instruction's operands. 85603e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman if (ConstantExpr *NewCE = dyn_cast<ConstantExpr>(Op)) 85703e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman Op = ConstantFoldConstantExpression(NewCE, TD, TLI); 85803e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman 85903e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman Ops.push_back(Op); 86003e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman } 86103e091f0b5f43beee12170efc00bbab86ffeb0dcDan Gohman 862f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner if (const CmpInst *CI = dyn_cast<CmpInst>(I)) 8638f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner return ConstantFoldCompareInstOperands(CI->getPredicate(), Ops[0], Ops[1], 864618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier TD, TLI); 865db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 866878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner if (const LoadInst *LI = dyn_cast<LoadInst>(I)) 867878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner return ConstantFoldLoadInst(LI, TD); 8683ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel 8693ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel if (InsertValueInst *IVI = dyn_cast<InsertValueInst>(I)) 8703ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel return ConstantExpr::getInsertValue( 8713ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel cast<Constant>(IVI->getAggregateOperand()), 8723ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel cast<Constant>(IVI->getInsertedValueOperand()), 873fc6d3a49867cd38954dc40936a88f1907252c6d2Jay Foad IVI->getIndices()); 8743ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel 8753ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel if (ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(I)) 8763ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel return ConstantExpr::getExtractValue( 8773ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel cast<Constant>(EVI->getAggregateOperand()), 878fc6d3a49867cd38954dc40936a88f1907252c6d2Jay Foad EVI->getIndices()); 8793ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel 880618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier return ConstantFoldInstOperands(I->getOpcode(), I->getType(), Ops, TD, TLI); 8815520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner} 8825520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 8833dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky/// ConstantFoldConstantExpression - Attempt to fold the constant expression 8843574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow/// using the specified DataLayout. If successful, the constant result is 8853dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky/// result is returned, if not, null is returned. 886baf0c67988feec5b7698f89dce499ddb7d0c3c42Dan GohmanConstant *llvm::ConstantFoldConstantExpression(const ConstantExpr *CE, 8873574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow const DataLayout *TD, 888618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier const TargetLibraryInfo *TLI) { 8893dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky SmallVector<Constant*, 8> Ops; 890c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner for (User::const_op_iterator i = CE->op_begin(), e = CE->op_end(); 891c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner i != e; ++i) { 89201b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman Constant *NewC = cast<Constant>(*i); 89301b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman // Recursively fold the ConstantExpr's operands. 89401b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman if (ConstantExpr *NewCE = dyn_cast<ConstantExpr>(NewC)) 895618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier NewC = ConstantFoldConstantExpression(NewCE, TD, TLI); 89601b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman Ops.push_back(NewC); 89701b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman } 8983dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky 8993dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky if (CE->isCompare()) 9008f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner return ConstantFoldCompareInstOperands(CE->getPredicate(), Ops[0], Ops[1], 901618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier TD, TLI); 902618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier return ConstantFoldInstOperands(CE->getOpcode(), CE->getType(), Ops, TD, TLI); 9033dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky} 9043dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky 9055520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// ConstantFoldInstOperands - Attempt to constant fold an instruction with the 9065520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// specified opcode and operands. If successful, the constant result is 9075520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// returned, if not, null is returned. Note that this function can fail when 9085520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// attempting to fold instructions like loads and stores, which have no 9095520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// constant expression form. 9105520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// 91101b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman/// TODO: This function neither utilizes nor preserves nsw/nuw/inbounds/etc 91201b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman/// information, due to only being passed an opcode and operands. Constant 91301b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman/// folding using this function strips this information. 91401b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman/// 915db2b2852256aba368cf6e75e049773768d159890NAKAMURA TakumiConstant *llvm::ConstantFoldInstOperands(unsigned Opcode, Type *DestTy, 9161d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foad ArrayRef<Constant *> Ops, 9173574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow const DataLayout *TD, 918db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi const TargetLibraryInfo *TLI) { 91903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Handle easy binops first. 920f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner if (Instruction::isBinaryOp(Opcode)) { 92103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (isa<ConstantExpr>(Ops[0]) || isa<ConstantExpr>(Ops[1])) 9227b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner if (Constant *C = SymbolicallyEvaluateBinop(Opcode, Ops[0], Ops[1], TD)) 92303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return C; 924db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 925baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::get(Opcode, Ops[0], Ops[1]); 92603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 927db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 928f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner switch (Opcode) { 9295520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner default: return 0; 93079fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner case Instruction::ICmp: 931858143816d43e58b17bfd11cb1b57afbd7f0f893Craig Topper case Instruction::FCmp: llvm_unreachable("Invalid for compares"); 9325520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::Call: 9331d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foad if (Function *F = dyn_cast<Function>(Ops.back())) 9345520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (canConstantFoldCallTo(F)) 935618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier return ConstantFoldCall(F, Ops.slice(0, Ops.size() - 1), TLI); 9365520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return 0; 937001f7534e0311508cc93831a595785bb177f8a18Chris Lattner case Instruction::PtrToInt: 938001f7534e0311508cc93831a595785bb177f8a18Chris Lattner // If the input is a inttoptr, eliminate the pair. This requires knowing 939001f7534e0311508cc93831a595785bb177f8a18Chris Lattner // the width of a pointer, so it can't be done in ConstantExpr::getCast. 940001f7534e0311508cc93831a595785bb177f8a18Chris Lattner if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ops[0])) { 941001f7534e0311508cc93831a595785bb177f8a18Chris Lattner if (TD && CE->getOpcode() == Instruction::IntToPtr) { 942001f7534e0311508cc93831a595785bb177f8a18Chris Lattner Constant *Input = CE->getOperand(0); 9436de29f8d960505421d61c80cdb738e16720b6c0eDan Gohman unsigned InWidth = Input->getType()->getScalarSizeInBits(); 944426c2bf5cdd2173e4a33aea8cb92cf684a724f4bChandler Carruth if (TD->getPointerSizeInBits() < InWidth) { 945db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi Constant *Mask = 9467b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner ConstantInt::get(CE->getContext(), APInt::getLowBitsSet(InWidth, 947426c2bf5cdd2173e4a33aea8cb92cf684a724f4bChandler Carruth TD->getPointerSizeInBits())); 948baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson Input = ConstantExpr::getAnd(Input, Mask); 94904aa2c3520c049333ca216fb794d700310c4a33dNick Lewycky } 950001f7534e0311508cc93831a595785bb177f8a18Chris Lattner // Do a zext or trunc to get to the dest size. 951baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getIntegerCast(Input, DestTy, false); 952001f7534e0311508cc93831a595785bb177f8a18Chris Lattner } 953001f7534e0311508cc93831a595785bb177f8a18Chris Lattner } 954baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getCast(Opcode, Ops[0], DestTy); 955001f7534e0311508cc93831a595785bb177f8a18Chris Lattner case Instruction::IntToPtr: 95681b06be055e74a3c23a1c8f17ead97f9f76335eeDuncan Sands // If the input is a ptrtoint, turn the pair into a ptr to ptr bitcast if 95781b06be055e74a3c23a1c8f17ead97f9f76335eeDuncan Sands // the int size is >= the ptr size. This requires knowing the width of a 95881b06be055e74a3c23a1c8f17ead97f9f76335eeDuncan Sands // pointer, so it can't be done in ConstantExpr::getCast. 959b80a2a686fe76496d71397f8bdda394d5718ab01Dan Gohman if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ops[0])) 960426c2bf5cdd2173e4a33aea8cb92cf684a724f4bChandler Carruth if (TD && 961426c2bf5cdd2173e4a33aea8cb92cf684a724f4bChandler Carruth TD->getPointerSizeInBits() <= CE->getType()->getScalarSizeInBits() && 962426c2bf5cdd2173e4a33aea8cb92cf684a724f4bChandler Carruth CE->getOpcode() == Instruction::PtrToInt) 963b80a2a686fe76496d71397f8bdda394d5718ab01Dan Gohman return FoldBitCast(CE->getOperand(0), DestTy, *TD); 964b80a2a686fe76496d71397f8bdda394d5718ab01Dan Gohman 965baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getCast(Opcode, Ops[0], DestTy); 9665520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::Trunc: 9675520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::ZExt: 9685520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::SExt: 9695520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::FPTrunc: 9705520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::FPExt: 9715520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::UIToFP: 9725520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::SIToFP: 9735520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::FPToUI: 9745520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::FPToSI: 975baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getCast(Opcode, Ops[0], DestTy); 9765520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::BitCast: 9771afab9c1e0ae2d145ce01718aa14065393117e70Chris Lattner if (TD) 9786333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner return FoldBitCast(Ops[0], DestTy, *TD); 979baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getBitCast(Ops[0], DestTy); 9805520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::Select: 981baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]); 9825520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::ExtractElement: 983baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getExtractElement(Ops[0], Ops[1]); 9845520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::InsertElement: 985baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]); 9865520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::ShuffleVector: 987baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]); 9885520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::GetElementPtr: 989618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier if (Constant *C = CastGEPIndices(Ops, DestTy, TD, TLI)) 9904f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman return C; 991618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier if (Constant *C = SymbolicallyEvaluateGEP(Ops, DestTy, TD, TLI)) 99203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return C; 993db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 994dab3d29605a5c83db41b28176273ef55961120c1Jay Foad return ConstantExpr::getGetElementPtr(Ops[0], Ops.slice(1)); 9955520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner } 9965520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner} 9975520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 998f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner/// ConstantFoldCompareInstOperands - Attempt to constant fold a compare 999f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner/// instruction (icmp/fcmp) with the specified operands. If it fails, it 1000f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner/// returns a constant expression of the specified operands. 1001f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner/// 1002f286f6fd93d569befe6e77c94a947e6e04e95685Chris LattnerConstant *llvm::ConstantFoldCompareInstOperands(unsigned Predicate, 1003db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi Constant *Ops0, Constant *Ops1, 10043574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow const DataLayout *TD, 1005618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier const TargetLibraryInfo *TLI) { 1006f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // fold: icmp (inttoptr x), null -> icmp x, 0 1007f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // fold: icmp (ptrtoint x), 0 -> icmp x, null 10083dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky // fold: icmp (inttoptr x), (inttoptr y) -> icmp trunc/zext x, trunc/zext y 1009f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // fold: icmp (ptrtoint x), (ptrtoint y) -> icmp x, y 1010f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // 1011f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // ConstantExpr::getCompare cannot do this, because it doesn't have TD 1012f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // around to know if bit truncation is happening. 10138f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner if (ConstantExpr *CE0 = dyn_cast<ConstantExpr>(Ops0)) { 10148f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner if (TD && Ops1->isNullValue()) { 1015ece6c6bb6329748b92403c06ac87f45c43485911Chandler Carruth Type *IntPtrTy = TD->getIntPtrType(CE0->getContext()); 1016f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner if (CE0->getOpcode() == Instruction::IntToPtr) { 1017f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // Convert the integer value to the right size to ensure we get the 1018f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // proper extension or truncation. 1019baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson Constant *C = ConstantExpr::getIntegerCast(CE0->getOperand(0), 1020f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner IntPtrTy, false); 10218f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner Constant *Null = Constant::getNullValue(C->getType()); 1022618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier return ConstantFoldCompareInstOperands(Predicate, C, Null, TD, TLI); 1023f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner } 1024db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 1025f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // Only do this transformation if the int is intptrty in size, otherwise 1026f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // there is a truncation or extension that we aren't modeling. 1027db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi if (CE0->getOpcode() == Instruction::PtrToInt && 1028ece6c6bb6329748b92403c06ac87f45c43485911Chandler Carruth CE0->getType() == IntPtrTy) { 1029ece6c6bb6329748b92403c06ac87f45c43485911Chandler Carruth Constant *C = CE0->getOperand(0); 1030ece6c6bb6329748b92403c06ac87f45c43485911Chandler Carruth Constant *Null = Constant::getNullValue(C->getType()); 1031ece6c6bb6329748b92403c06ac87f45c43485911Chandler Carruth return ConstantFoldCompareInstOperands(Predicate, C, Null, TD, TLI); 1032f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner } 1033f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner } 1034db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 10358f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner if (ConstantExpr *CE1 = dyn_cast<ConstantExpr>(Ops1)) { 10363dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky if (TD && CE0->getOpcode() == CE1->getOpcode()) { 1037ece6c6bb6329748b92403c06ac87f45c43485911Chandler Carruth Type *IntPtrTy = TD->getIntPtrType(CE0->getContext()); 10383dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky 10393dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky if (CE0->getOpcode() == Instruction::IntToPtr) { 10403dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky // Convert the integer value to the right size to ensure we get the 10413dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky // proper extension or truncation. 1042baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson Constant *C0 = ConstantExpr::getIntegerCast(CE0->getOperand(0), 10433dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky IntPtrTy, false); 1044baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson Constant *C1 = ConstantExpr::getIntegerCast(CE1->getOperand(0), 10453dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky IntPtrTy, false); 1046618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier return ConstantFoldCompareInstOperands(Predicate, C0, C1, TD, TLI); 10473dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky } 10483dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky 1049ece6c6bb6329748b92403c06ac87f45c43485911Chandler Carruth // Only do this transformation if the int is intptrty in size, otherwise 1050ece6c6bb6329748b92403c06ac87f45c43485911Chandler Carruth // there is a truncation or extension that we aren't modeling. 1051ece6c6bb6329748b92403c06ac87f45c43485911Chandler Carruth if ((CE0->getOpcode() == Instruction::PtrToInt && 1052ece6c6bb6329748b92403c06ac87f45c43485911Chandler Carruth CE0->getType() == IntPtrTy && 1053ece6c6bb6329748b92403c06ac87f45c43485911Chandler Carruth CE0->getOperand(0)->getType() == CE1->getOperand(0)->getType())) 10548f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner return ConstantFoldCompareInstOperands(Predicate, CE0->getOperand(0), 1055ece6c6bb6329748b92403c06ac87f45c43485911Chandler Carruth CE1->getOperand(0), TD, TLI); 1056f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner } 1057f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner } 1058db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 105979fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner // icmp eq (or x, y), 0 -> (icmp eq x, 0) & (icmp eq y, 0) 106079fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner // icmp ne (or x, y), 0 -> (icmp ne x, 0) | (icmp ne y, 0) 106179fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner if ((Predicate == ICmpInst::ICMP_EQ || Predicate == ICmpInst::ICMP_NE) && 106279fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner CE0->getOpcode() == Instruction::Or && Ops1->isNullValue()) { 1063db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi Constant *LHS = 1064618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier ConstantFoldCompareInstOperands(Predicate, CE0->getOperand(0), Ops1, 1065618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier TD, TLI); 1066db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi Constant *RHS = 1067618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier ConstantFoldCompareInstOperands(Predicate, CE0->getOperand(1), Ops1, 1068618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier TD, TLI); 1069db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi unsigned OpC = 107079fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner Predicate == ICmpInst::ICMP_EQ ? Instruction::And : Instruction::Or; 107179fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner Constant *Ops[] = { LHS, RHS }; 1072618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier return ConstantFoldInstOperands(OpC, LHS->getType(), Ops, TD, TLI); 107379fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner } 1074f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner } 1075db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 10768f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner return ConstantExpr::getCompare(Predicate, Ops0, Ops1); 1077f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner} 1078f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner 1079f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner 10805520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// ConstantFoldLoadThroughGEPConstantExpr - Given a constant and a 10815520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// getelementptr constantexpr, return the constant value being addressed by the 10825520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// constant expression, or null if something is funny and we can't decide. 1083db2b2852256aba368cf6e75e049773768d159890NAKAMURA TakumiConstant *llvm::ConstantFoldLoadThroughGEPConstantExpr(Constant *C, 1084c6f69e94fa46f585b59bb9d7ace3224b0e638c95Dan Gohman ConstantExpr *CE) { 1085a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner if (!CE->getOperand(1)->isNullValue()) 10865520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return 0; // Do not allow stepping over the value! 1087a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner 1088a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner // Loop over all of the operands, tracking down which value we are 1089a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner // addressing. 1090a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner for (unsigned i = 2, e = CE->getNumOperands(); i != e; ++i) { 1091a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner C = C->getAggregateElement(CE->getOperand(i)); 1092a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner if (C == 0) return 0; 1093a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner } 1094a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner return C; 1095a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner} 1096a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner 1097a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner/// ConstantFoldLoadThroughGEPIndices - Given a constant and getelementptr 1098a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner/// indices (with an *implied* zero pointer index that is not in the list), 1099a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner/// return the constant value being addressed by a virtual load, or null if 1100a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner/// something is funny and we can't decide. 1101a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris LattnerConstant *llvm::ConstantFoldLoadThroughGEPIndices(Constant *C, 1102a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner ArrayRef<Constant*> Indices) { 11035520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner // Loop over all of the operands, tracking down which value we are 1104a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner // addressing. 1105a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner for (unsigned i = 0, e = Indices.size(); i != e; ++i) { 1106a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner C = C->getAggregateElement(Indices[i]); 1107a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner if (C == 0) return 0; 1108a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner } 11095520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return C; 11105520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner} 11115520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 11125520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 1113bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell//===----------------------------------------------------------------------===// 11145520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner// Constant Folding for Calls 1115bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// 1116bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 1117bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell/// canConstantFoldCallTo - Return true if its even possible to fold a call to 1118bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell/// the specified function. 1119bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswellbool 1120fa9b80eb64127b3d9691e18537975635520e51e9Dan Gohmanllvm::canConstantFoldCallTo(const Function *F) { 1121bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell switch (F->getIntrinsicID()) { 112242258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson case Intrinsic::fabs: 112342258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson case Intrinsic::log: 112442258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson case Intrinsic::log2: 112542258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson case Intrinsic::log10: 112642258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson case Intrinsic::exp: 112742258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson case Intrinsic::exp2: 112842258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson case Intrinsic::floor: 11299ab7fb3ba47442d521a5bed09a27a5e8e7a786edDale Johannesen case Intrinsic::sqrt: 113024fbf2bf161b20b13d0a218345bdcd092bdd56f8Chad Rosier case Intrinsic::pow: 11319ab7fb3ba47442d521a5bed09a27a5e8e7a786edDale Johannesen case Intrinsic::powi: 1132e9391fd9b52e93717b365bdd05c471101323a4dfReid Spencer case Intrinsic::bswap: 1133e9391fd9b52e93717b365bdd05c471101323a4dfReid Spencer case Intrinsic::ctpop: 1134e9391fd9b52e93717b365bdd05c471101323a4dfReid Spencer case Intrinsic::ctlz: 1135e9391fd9b52e93717b365bdd05c471101323a4dfReid Spencer case Intrinsic::cttz: 11361614e50d9f6d48a38e4dafb4b1a51fd4b37614f3Evan Phoenix case Intrinsic::sadd_with_overflow: 11376208610fd602ebdb18bb793152899573d0b2b7abFrits van Bommel case Intrinsic::uadd_with_overflow: 11381614e50d9f6d48a38e4dafb4b1a51fd4b37614f3Evan Phoenix case Intrinsic::ssub_with_overflow: 11396208610fd602ebdb18bb793152899573d0b2b7abFrits van Bommel case Intrinsic::usub_with_overflow: 1140eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::smul_with_overflow: 11416208610fd602ebdb18bb793152899573d0b2b7abFrits van Bommel case Intrinsic::umul_with_overflow: 1142faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov case Intrinsic::convert_from_fp16: 1143faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov case Intrinsic::convert_to_fp16: 114415ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse_cvtss2si: 114515ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse_cvtss2si64: 114615ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse_cvttss2si: 114715ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse_cvttss2si64: 114815ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse2_cvtsd2si: 114915ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse2_cvtsd2si64: 115015ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse2_cvttsd2si: 115115ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse2_cvttsd2si64: 1152bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell return true; 115368a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner default: 115468a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner return false; 115568a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner case 0: break; 1156bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 1157bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 11586f532a988e5c02fcb271fb65e9e7b83f0147d3f2Chris Lattner if (!F->hasName()) return false; 1159f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar StringRef Name = F->getName(); 1160db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 1161c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner // In these cases, the check of the length is required. We don't want to 1162c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner // return true for a name like "cos\0blah" which strcmp would return equal to 1163c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner // "cos", but has length 8. 1164f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar switch (Name[0]) { 1165c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner default: return false; 1166c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'a': 11674ffec108a927606c51ea6fe1f3a13863d50d1c48Chad Rosier return Name == "acos" || Name == "asin" || Name == "atan" || Name =="atan2"; 1168c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'c': 1169f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar return Name == "cos" || Name == "ceil" || Name == "cosf" || Name == "cosh"; 1170c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'e': 1171805fa97a0f5ff61624855da37d4881708fb8f0fbChris Lattner return Name == "exp" || Name == "exp2"; 1172c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'f': 1173f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar return Name == "fabs" || Name == "fmod" || Name == "floor"; 1174c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'l': 1175f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar return Name == "log" || Name == "log10"; 1176c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'p': 1177f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar return Name == "pow"; 1178c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 's': 1179f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar return Name == "sin" || Name == "sinh" || Name == "sqrt" || 1180f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar Name == "sinf" || Name == "sqrtf"; 1181c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 't': 1182f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar return Name == "tan" || Name == "tanh"; 1183bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 1184bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell} 1185bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 1186db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumistatic Constant *ConstantFoldFP(double (*NativeFP)(double), double V, 1187db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *Ty) { 11883f2f21e640682c604d9322ba0708e122d1fcf5eeDan Gohman sys::llvm_fenv_clearexcept(); 1189bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell V = NativeFP(V); 11903f2f21e640682c604d9322ba0708e122d1fcf5eeDan Gohman if (sys::llvm_fenv_testexcept()) { 11913f2f21e640682c604d9322ba0708e122d1fcf5eeDan Gohman sys::llvm_fenv_clearexcept(); 1192f19f58a9360927f8ef50b9a029e8efb780d3d8a8Chris Lattner return 0; 119343421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen } 1194db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 119542258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson if (Ty->isHalfTy()) { 119642258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson APFloat APF(V); 119742258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson bool unused; 119842258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson APF.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven, &unused); 119942258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson return ConstantFP::get(Ty->getContext(), APF); 120042258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson } 1201d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner if (Ty->isFloatTy()) 12027b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFP::get(Ty->getContext(), APFloat((float)V)); 1203d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner if (Ty->isDoubleTy()) 12047b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFP::get(Ty->getContext(), APFloat(V)); 120542258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson llvm_unreachable("Can only constant fold half/float/double"); 1206bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell} 1207bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 1208384152444d22d356f7b4090a158da4cbc1f79464Dan Gohmanstatic Constant *ConstantFoldBinaryFP(double (*NativeFP)(double, double), 1209db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner double V, double W, Type *Ty) { 12103f2f21e640682c604d9322ba0708e122d1fcf5eeDan Gohman sys::llvm_fenv_clearexcept(); 1211384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman V = NativeFP(V, W); 12123f2f21e640682c604d9322ba0708e122d1fcf5eeDan Gohman if (sys::llvm_fenv_testexcept()) { 12133f2f21e640682c604d9322ba0708e122d1fcf5eeDan Gohman sys::llvm_fenv_clearexcept(); 1214f19f58a9360927f8ef50b9a029e8efb780d3d8a8Chris Lattner return 0; 121543421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen } 1216db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 121742258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson if (Ty->isHalfTy()) { 121842258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson APFloat APF(V); 121942258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson bool unused; 122042258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson APF.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven, &unused); 122142258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson return ConstantFP::get(Ty->getContext(), APF); 122242258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson } 1223d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner if (Ty->isFloatTy()) 12247b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFP::get(Ty->getContext(), APFloat((float)V)); 1225d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner if (Ty->isDoubleTy()) 12267b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFP::get(Ty->getContext(), APFloat(V)); 122742258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson llvm_unreachable("Can only constant fold half/float/double"); 1228384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman} 1229384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman 123015ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth/// ConstantFoldConvertToInt - Attempt to an SSE floating point to integer 123115ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth/// conversion of a constant floating point. If roundTowardZero is false, the 123215ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth/// default IEEE rounding is used (toward nearest, ties to even). This matches 123315ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth/// the behavior of the non-truncating SSE instructions in the default rounding 123415ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth/// mode. The desired integer type Ty is used to select how many bits are 123515ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth/// available for the result. Returns null if the conversion cannot be 123615ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth/// performed, otherwise returns the Constant value resulting from the 123715ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth/// conversion. 12386b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattnerstatic Constant *ConstantFoldConvertToInt(const APFloat &Val, 12396b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner bool roundTowardZero, Type *Ty) { 124015ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth // All of these conversion intrinsics form an integer of at most 64bits. 124115ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth unsigned ResultWidth = cast<IntegerType>(Ty)->getBitWidth(); 124215ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth assert(ResultWidth <= 64 && 124315ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth "Can only constant fold conversions to 64 and 32 bit ints"); 124415ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth 124515ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth uint64_t UIntVal; 124615ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth bool isExact = false; 124715ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth APFloat::roundingMode mode = roundTowardZero? APFloat::rmTowardZero 124815ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth : APFloat::rmNearestTiesToEven; 124915ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth APFloat::opStatus status = Val.convertToInteger(&UIntVal, ResultWidth, 125015ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth /*isSigned=*/true, mode, 125115ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth &isExact); 125215ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth if (status != APFloat::opOK && status != APFloat::opInexact) 125315ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth return 0; 125415ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth return ConstantInt::get(Ty, UIntVal, /*isSigned=*/true); 125515ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth} 125615ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth 1257bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell/// ConstantFoldCall - Attempt to constant fold a call to the specified function 1258bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell/// with the specified arguments, returning null if unsuccessful. 1259bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John CriswellConstant * 1260618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosierllvm::ConstantFoldCall(Function *F, ArrayRef<Constant *> Operands, 1261618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier const TargetLibraryInfo *TLI) { 12626f532a988e5c02fcb271fb65e9e7b83f0147d3f2Chris Lattner if (!F->hasName()) return 0; 1263f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar StringRef Name = F->getName(); 1264e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner 1265db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *Ty = F->getReturnType(); 12661d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foad if (Operands.size() == 1) { 1267bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell if (ConstantFP *Op = dyn_cast<ConstantFP>(Operands[0])) { 1268f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth if (F->getIntrinsicID() == Intrinsic::convert_to_fp16) { 1269faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov APFloat Val(Op->getValueAPF()); 1270faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov 1271faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov bool lost = false; 1272faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov Val.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven, &lost); 1273faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov 1274faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov return ConstantInt::get(F->getContext(), Val.bitcastToAPInt()); 1275faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov } 127621646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (!TLI) 127721646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier return 0; 1278faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov 127942258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson if (!Ty->isHalfTy() && !Ty->isFloatTy() && !Ty->isDoubleTy()) 128043421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen return 0; 12811f386c4ce1983c448320aecca8d3cd27d1497867Jakob Stoklund Olesen 12821f386c4ce1983c448320aecca8d3cd27d1497867Jakob Stoklund Olesen /// We only fold functions with finite arguments. Folding NaN and inf is 12831f386c4ce1983c448320aecca8d3cd27d1497867Jakob Stoklund Olesen /// likely to be aborted with an exception anyway, and some host libms 12841f386c4ce1983c448320aecca8d3cd27d1497867Jakob Stoklund Olesen /// have known errors raising exceptions. 12851f386c4ce1983c448320aecca8d3cd27d1497867Jakob Stoklund Olesen if (Op->getValueAPF().isNaN() || Op->getValueAPF().isInfinity()) 12861f386c4ce1983c448320aecca8d3cd27d1497867Jakob Stoklund Olesen return 0; 12871f386c4ce1983c448320aecca8d3cd27d1497867Jakob Stoklund Olesen 128843421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen /// Currently APFloat versions of these functions do not exist, so we use 128943421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen /// the host native double versions. Float versions are not called 129043421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen /// directly but for all these it is true (float)(f((double)arg)) == 129143421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen /// f(arg). Long double not supported yet. 129242258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson double V; 129342258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson if (Ty->isFloatTy()) 129442258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson V = Op->getValueAPF().convertToFloat(); 129542258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson else if (Ty->isDoubleTy()) 129642258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson V = Op->getValueAPF().convertToDouble(); 129742258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson else { 129842258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson bool unused; 129942258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson APFloat APF = Op->getValueAPF(); 130042258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &unused); 130142258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson V = APF.convertToDouble(); 130242258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson } 130342258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson 130442258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson switch (F->getIntrinsicID()) { 130542258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson default: break; 130642258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson case Intrinsic::fabs: 130742258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson return ConstantFoldFP(fabs, V, Ty); 1308ec643abe6903284fc9ae7b6d9ae5e0b4ad40ad28Owen Anderson#if HAVE_LOG2 130942258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson case Intrinsic::log2: 131042258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson return ConstantFoldFP(log2, V, Ty); 1311ec643abe6903284fc9ae7b6d9ae5e0b4ad40ad28Owen Anderson#endif 1312ec643abe6903284fc9ae7b6d9ae5e0b4ad40ad28Owen Anderson#if HAVE_LOG 131342258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson case Intrinsic::log: 131442258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson return ConstantFoldFP(log, V, Ty); 1315ec643abe6903284fc9ae7b6d9ae5e0b4ad40ad28Owen Anderson#endif 1316ec643abe6903284fc9ae7b6d9ae5e0b4ad40ad28Owen Anderson#if HAVE_LOG10 131742258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson case Intrinsic::log10: 131842258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson return ConstantFoldFP(log10, V, Ty); 1319ec643abe6903284fc9ae7b6d9ae5e0b4ad40ad28Owen Anderson#endif 1320ec643abe6903284fc9ae7b6d9ae5e0b4ad40ad28Owen Anderson#if HAVE_EXP 132142258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson case Intrinsic::exp: 132242258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson return ConstantFoldFP(exp, V, Ty); 1323ec643abe6903284fc9ae7b6d9ae5e0b4ad40ad28Owen Anderson#endif 1324ec643abe6903284fc9ae7b6d9ae5e0b4ad40ad28Owen Anderson#if HAVE_EXP2 132542258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson case Intrinsic::exp2: 132642258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson return ConstantFoldFP(exp2, V, Ty); 1327ec643abe6903284fc9ae7b6d9ae5e0b4ad40ad28Owen Anderson#endif 132842258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson case Intrinsic::floor: 132942258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson return ConstantFoldFP(floor, V, Ty); 133042258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson } 133142258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson 1332f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar switch (Name[0]) { 1333c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'a': 133421646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "acos" && TLI->has(LibFunc::acos)) 13357b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(acos, V, Ty); 133621646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "asin" && TLI->has(LibFunc::asin)) 13377b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(asin, V, Ty); 133821646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "atan" && TLI->has(LibFunc::atan)) 13397b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(atan, V, Ty); 1340c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 1341c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'c': 134221646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "ceil" && TLI->has(LibFunc::ceil)) 13437b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(ceil, V, Ty); 134421646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "cos" && TLI->has(LibFunc::cos)) 13457b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(cos, V, Ty); 134621646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "cosh" && TLI->has(LibFunc::cosh)) 13477b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(cosh, V, Ty); 134821646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "cosf" && TLI->has(LibFunc::cosf)) 13497b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(cos, V, Ty); 1350c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 1351c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'e': 135221646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "exp" && TLI->has(LibFunc::exp)) 13537b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(exp, V, Ty); 1354db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 135521646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "exp2" && TLI->has(LibFunc::exp2)) { 1356805fa97a0f5ff61624855da37d4881708fb8f0fbChris Lattner // Constant fold exp2(x) as pow(2,x) in case the host doesn't have a 1357805fa97a0f5ff61624855da37d4881708fb8f0fbChris Lattner // C99 library. 1358805fa97a0f5ff61624855da37d4881708fb8f0fbChris Lattner return ConstantFoldBinaryFP(pow, 2.0, V, Ty); 1359805fa97a0f5ff61624855da37d4881708fb8f0fbChris Lattner } 1360c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 1361c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'f': 136221646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "fabs" && TLI->has(LibFunc::fabs)) 13637b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(fabs, V, Ty); 136421646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "floor" && TLI->has(LibFunc::floor)) 13657b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(floor, V, Ty); 1366c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 1367c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'l': 136821646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "log" && V > 0 && TLI->has(LibFunc::log)) 13697b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(log, V, Ty); 137021646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "log10" && V > 0 && TLI->has(LibFunc::log10)) 13717b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(log10, V, Ty); 1372f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth else if (F->getIntrinsicID() == Intrinsic::sqrt && 137342258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson (Ty->isHalfTy() || Ty->isFloatTy() || Ty->isDoubleTy())) { 1374c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (V >= -0.0) 13757b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(sqrt, V, Ty); 1376c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else // Undefined 1377a7235ea7245028a0723e8ab7fd011386b3900777Owen Anderson return Constant::getNullValue(Ty); 1378c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner } 1379c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 1380c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 's': 138121646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "sin" && TLI->has(LibFunc::sin)) 13827b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(sin, V, Ty); 138321646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "sinh" && TLI->has(LibFunc::sinh)) 13847b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(sinh, V, Ty); 138521646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "sqrt" && V >= 0 && TLI->has(LibFunc::sqrt)) 13867b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(sqrt, V, Ty); 138721646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "sqrtf" && V >= 0 && TLI->has(LibFunc::sqrtf)) 13887b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(sqrt, V, Ty); 138921646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "sinf" && TLI->has(LibFunc::sinf)) 13907b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(sin, V, Ty); 1391c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 1392c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 't': 139321646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "tan" && TLI->has(LibFunc::tan)) 13947b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(tan, V, Ty); 139521646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "tanh" && TLI->has(LibFunc::tanh)) 13967b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(tanh, V, Ty); 1397c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 1398c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner default: 1399c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 1400bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 140168a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner return 0; 140268a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner } 1403f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth 140468a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner if (ConstantInt *Op = dyn_cast<ConstantInt>(Operands[0])) { 1405f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth switch (F->getIntrinsicID()) { 1406f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth case Intrinsic::bswap: 14077b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantInt::get(F->getContext(), Op->getValue().byteSwap()); 1408f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth case Intrinsic::ctpop: 1409eed707b1e6097aac2bb6b3d47271f6300ace7f2eOwen Anderson return ConstantInt::get(Ty, Op->getValue().countPopulation()); 1410f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth case Intrinsic::convert_from_fp16: { 14110a29cb045444c13160e90fe7942a9d7c720185edTim Northover APFloat Val(APFloat::IEEEhalf, Op->getValue()); 1412faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov 1413faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov bool lost = false; 1414faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov APFloat::opStatus status = 1415faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov Val.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &lost); 1416faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov 1417faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov // Conversion is always precise. 14188e68c3873549ca31533e2e3e40dda3a43cb79566Jeffrey Yasskin (void)status; 1419faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov assert(status == APFloat::opOK && !lost && 1420faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov "Precision lost during fp16 constfolding"); 1421faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov 1422faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov return ConstantFP::get(F->getContext(), Val); 1423faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov } 1424f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth default: 1425f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth return 0; 1426f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth } 1427bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 1428f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth 14296b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner // Support ConstantVector in case we have an Undef in the top. 1430db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi if (isa<ConstantVector>(Operands[0]) || 14316b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner isa<ConstantDataVector>(Operands[0])) { 14326b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner Constant *Op = cast<Constant>(Operands[0]); 143315ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth switch (F->getIntrinsicID()) { 143415ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth default: break; 143515ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse_cvtss2si: 143615ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse_cvtss2si64: 143715ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse2_cvtsd2si: 143815ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse2_cvtsd2si64: 14396b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner if (ConstantFP *FPOp = 14406b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner dyn_cast_or_null<ConstantFP>(Op->getAggregateElement(0U))) 14416b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner return ConstantFoldConvertToInt(FPOp->getValueAPF(), 14426b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner /*roundTowardZero=*/false, Ty); 144315ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse_cvttss2si: 144415ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse_cvttss2si64: 144515ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse2_cvttsd2si: 144615ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse2_cvttsd2si64: 14476b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner if (ConstantFP *FPOp = 14486b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner dyn_cast_or_null<ConstantFP>(Op->getAggregateElement(0U))) 1449db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi return ConstantFoldConvertToInt(FPOp->getValueAPF(), 14506b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner /*roundTowardZero=*/true, Ty); 145115ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth } 145215ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth } 1453db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 14549ee7123ab462d97a2b242280e9bf0b47883531cbDan Gohman if (isa<UndefValue>(Operands[0])) { 1455f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth if (F->getIntrinsicID() == Intrinsic::bswap) 14569ee7123ab462d97a2b242280e9bf0b47883531cbDan Gohman return Operands[0]; 14579ee7123ab462d97a2b242280e9bf0b47883531cbDan Gohman return 0; 14589ee7123ab462d97a2b242280e9bf0b47883531cbDan Gohman } 14599ee7123ab462d97a2b242280e9bf0b47883531cbDan Gohman 146068a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner return 0; 146168a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner } 1462f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth 14631d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foad if (Operands.size() == 2) { 1464bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell if (ConstantFP *Op1 = dyn_cast<ConstantFP>(Operands[0])) { 146542258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson if (!Ty->isHalfTy() && !Ty->isFloatTy() && !Ty->isDoubleTy()) 14669ab7fb3ba47442d521a5bed09a27a5e8e7a786edDale Johannesen return 0; 146742258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson double Op1V; 146842258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson if (Ty->isFloatTy()) 146942258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson Op1V = Op1->getValueAPF().convertToFloat(); 147042258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson else if (Ty->isDoubleTy()) 147142258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson Op1V = Op1->getValueAPF().convertToDouble(); 147242258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson else { 147342258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson bool unused; 147442258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson APFloat APF = Op1->getValueAPF(); 147542258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &unused); 147642258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson Op1V = APF.convertToDouble(); 147742258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson } 147842258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson 1479bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell if (ConstantFP *Op2 = dyn_cast<ConstantFP>(Operands[1])) { 1480d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner if (Op2->getType() != Op1->getType()) 1481d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner return 0; 148221646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier 148342258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson double Op2V; 148442258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson if (Ty->isFloatTy()) 148542258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson Op2V = Op2->getValueAPF().convertToFloat(); 148642258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson else if (Ty->isDoubleTy()) 148742258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson Op2V = Op2->getValueAPF().convertToDouble(); 148842258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson else { 148942258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson bool unused; 149042258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson APFloat APF = Op2->getValueAPF(); 149142258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &unused); 149242258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson Op2V = APF.convertToDouble(); 149342258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson } 1494bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 149524fbf2bf161b20b13d0a218345bdcd092bdd56f8Chad Rosier if (F->getIntrinsicID() == Intrinsic::pow) { 149624fbf2bf161b20b13d0a218345bdcd092bdd56f8Chad Rosier return ConstantFoldBinaryFP(pow, Op1V, Op2V, Ty); 149724fbf2bf161b20b13d0a218345bdcd092bdd56f8Chad Rosier } 149824fbf2bf161b20b13d0a218345bdcd092bdd56f8Chad Rosier if (!TLI) 149924fbf2bf161b20b13d0a218345bdcd092bdd56f8Chad Rosier return 0; 150021646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "pow" && TLI->has(LibFunc::pow)) 15017b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldBinaryFP(pow, Op1V, Op2V, Ty); 150221646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "fmod" && TLI->has(LibFunc::fmod)) 15037b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldBinaryFP(fmod, Op1V, Op2V, Ty); 150421646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "atan2" && TLI->has(LibFunc::atan2)) 15057b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldBinaryFP(atan2, Op1V, Op2V, Ty); 1506b5282dcf4745be59046f440980a1c0f0a50c9c09Chris Lattner } else if (ConstantInt *Op2C = dyn_cast<ConstantInt>(Operands[1])) { 150742258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson if (F->getIntrinsicID() == Intrinsic::powi && Ty->isHalfTy()) 150842258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson return ConstantFP::get(F->getContext(), 150942258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson APFloat((float)std::pow((float)Op1V, 151042258e0ea8781dd29cae4b1a6eb54d8c70dcea0bOwen Anderson (int)Op2C->getZExtValue()))); 1511f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth if (F->getIntrinsicID() == Intrinsic::powi && Ty->isFloatTy()) 15127b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFP::get(F->getContext(), 15137b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner APFloat((float)std::pow((float)Op1V, 151402a260aa11a2e1b2c14335274d3c42ca3f3eabc0Chris Lattner (int)Op2C->getZExtValue()))); 1515f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth if (F->getIntrinsicID() == Intrinsic::powi && Ty->isDoubleTy()) 15167b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFP::get(F->getContext(), 15177b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner APFloat((double)std::pow((double)Op1V, 15187b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner (int)Op2C->getZExtValue()))); 1519bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 152068a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner return 0; 1521bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 1522db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 1523e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner if (ConstantInt *Op1 = dyn_cast<ConstantInt>(Operands[0])) { 1524e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner if (ConstantInt *Op2 = dyn_cast<ConstantInt>(Operands[1])) { 1525e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner switch (F->getIntrinsicID()) { 1526e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner default: break; 1527eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::sadd_with_overflow: 1528eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::uadd_with_overflow: 1529eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::ssub_with_overflow: 1530eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::usub_with_overflow: 15316208610fd602ebdb18bb793152899573d0b2b7abFrits van Bommel case Intrinsic::smul_with_overflow: 15326208610fd602ebdb18bb793152899573d0b2b7abFrits van Bommel case Intrinsic::umul_with_overflow: { 1533eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner APInt Res; 1534eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner bool Overflow; 1535eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner switch (F->getIntrinsicID()) { 1536858143816d43e58b17bfd11cb1b57afbd7f0f893Craig Topper default: llvm_unreachable("Invalid case"); 1537eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::sadd_with_overflow: 1538eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner Res = Op1->getValue().sadd_ov(Op2->getValue(), Overflow); 1539eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner break; 1540eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::uadd_with_overflow: 1541eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner Res = Op1->getValue().uadd_ov(Op2->getValue(), Overflow); 1542eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner break; 1543eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::ssub_with_overflow: 1544eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner Res = Op1->getValue().ssub_ov(Op2->getValue(), Overflow); 1545eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner break; 1546eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::usub_with_overflow: 1547eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner Res = Op1->getValue().usub_ov(Op2->getValue(), Overflow); 1548eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner break; 1549eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::smul_with_overflow: 1550eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner Res = Op1->getValue().smul_ov(Op2->getValue(), Overflow); 1551eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner break; 15526208610fd602ebdb18bb793152899573d0b2b7abFrits van Bommel case Intrinsic::umul_with_overflow: 15536208610fd602ebdb18bb793152899573d0b2b7abFrits van Bommel Res = Op1->getValue().umul_ov(Op2->getValue(), Overflow); 15546208610fd602ebdb18bb793152899573d0b2b7abFrits van Bommel break; 1555eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner } 1556e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner Constant *Ops[] = { 1557eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner ConstantInt::get(F->getContext(), Res), 1558eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner ConstantInt::get(Type::getInt1Ty(F->getContext()), Overflow) 1559e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner }; 1560b065b06c12dba6001b8140df2744d0c856ef6ea1Chris Lattner return ConstantStruct::get(cast<StructType>(F->getReturnType()), Ops); 1561e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner } 1562ccbf1e36d34c2d66600748bdd8767dc122629a58Chandler Carruth case Intrinsic::cttz: 1563e5742464895b7f1fcc6a5b968b72f6ec66a1fd44Benjamin Kramer if (Op2->isOne() && Op1->isZero()) // cttz(0, 1) is undef. 1564e5742464895b7f1fcc6a5b968b72f6ec66a1fd44Benjamin Kramer return UndefValue::get(Ty); 1565ccbf1e36d34c2d66600748bdd8767dc122629a58Chandler Carruth return ConstantInt::get(Ty, Op1->getValue().countTrailingZeros()); 1566ccbf1e36d34c2d66600748bdd8767dc122629a58Chandler Carruth case Intrinsic::ctlz: 1567e5742464895b7f1fcc6a5b968b72f6ec66a1fd44Benjamin Kramer if (Op2->isOne() && Op1->isZero()) // ctlz(0, 1) is undef. 1568e5742464895b7f1fcc6a5b968b72f6ec66a1fd44Benjamin Kramer return UndefValue::get(Ty); 1569ccbf1e36d34c2d66600748bdd8767dc122629a58Chandler Carruth return ConstantInt::get(Ty, Op1->getValue().countLeadingZeros()); 1570e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner } 1571e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner } 1572db2b2852256aba368cf6e75e049773768d159890NAKAMURA Takumi 1573e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner return 0; 1574e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner } 1575e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner return 0; 1576bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 1577bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell return 0; 1578bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell} 1579