ConstantFolding.cpp revision 7302d80490feabfc8a01bee0fa698aab55169544
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// 1283e3c4f9d796a5da223a3ebd5d4ba985c7ecc39dDan Gohman// Also, to supplement the basic VMCore ConstantExpr simplifications, 1383e3c4f9d796a5da223a3ebd5d4ba985c7ecc39dDan Gohman// this file defines some additional folding routines that can make use of 1483e3c4f9d796a5da223a3ebd5d4ba985c7ecc39dDan Gohman// TargetData information. These functions cannot go in VMCore due to library 1583e3c4f9d796a5da223a3ebd5d4ba985c7ecc39dDan Gohman// dependency issues. 16bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// 17bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell//===----------------------------------------------------------------------===// 18bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 19bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include "llvm/Analysis/ConstantFolding.h" 20bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include "llvm/Constants.h" 21bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include "llvm/DerivedTypes.h" 225520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner#include "llvm/Function.h" 239a38e3e3991ea443e555d8060f91202a786acdd4Dan Gohman#include "llvm/GlobalVariable.h" 24bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include "llvm/Instructions.h" 25bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include "llvm/Intrinsics.h" 26562b84b3aea359d1f918184e355da82bf05eb290Jay Foad#include "llvm/Operator.h" 2762d327e241f59735eed836e98c8f11ffaa6cf6f8Chris Lattner#include "llvm/Analysis/ValueTracking.h" 2862d327e241f59735eed836e98c8f11ffaa6cf6f8Chris Lattner#include "llvm/Target/TargetData.h" 29618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier#include "llvm/Target/TargetLibraryInfo.h" 305520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner#include "llvm/ADT/SmallVector.h" 31c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner#include "llvm/ADT/StringMap.h" 32c25e7581b9b8088910da31702d4ca21c4734c6d7Torok Edwin#include "llvm/Support/ErrorHandling.h" 33bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include "llvm/Support/GetElementPtrTypeIterator.h" 34bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include "llvm/Support/MathExtras.h" 3583471853b1d5a9efe6b9e7565c457fc901f84926Rafael Espindola#include "llvm/Support/FEnv.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 446333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner/// FoldBitCast - Constant fold bitcast, symbolically evaluating it with 456333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner/// TargetData. 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, 486333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner const TargetData &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)) { 577302d80490feabfc8a01bee0fa698aab55169544Chris Lattner ConstantDataVector *CDV = dyn_cast<ConstantDataVector>(C); 587302d80490feabfc8a01bee0fa698aab55169544Chris Lattner if (CDV == 0) 5904594aeffa3360882eb09a888a0970321b987b16Rafael Espindola return ConstantExpr::getBitCast(C, DestTy); 6004594aeffa3360882eb09a888a0970321b987b16Rafael Espindola 617302d80490feabfc8a01bee0fa698aab55169544Chris Lattner unsigned NumSrcElts = CDV->getType()->getNumElements(); 627302d80490feabfc8a01bee0fa698aab55169544Chris Lattner 637302d80490feabfc8a01bee0fa698aab55169544Chris Lattner Type *SrcEltTy = CDV->getType()->getElementType(); 6404594aeffa3360882eb09a888a0970321b987b16Rafael Espindola 6504594aeffa3360882eb09a888a0970321b987b16Rafael Espindola // If the vector is a vector of floating point, convert it to vector of int 6604594aeffa3360882eb09a888a0970321b987b16Rafael Espindola // to simplify things. 677302d80490feabfc8a01bee0fa698aab55169544Chris Lattner if (SrcEltTy->isFloatingPointTy()) { 687302d80490feabfc8a01bee0fa698aab55169544Chris Lattner unsigned FPWidth = SrcEltTy->getPrimitiveSizeInBits(); 6904594aeffa3360882eb09a888a0970321b987b16Rafael Espindola Type *SrcIVTy = 7004594aeffa3360882eb09a888a0970321b987b16Rafael Espindola VectorType::get(IntegerType::get(C->getContext(), FPWidth), NumSrcElts); 7104594aeffa3360882eb09a888a0970321b987b16Rafael Espindola // Ask VMCore to do the conversion now that #elts line up. 7204594aeffa3360882eb09a888a0970321b987b16Rafael Espindola C = ConstantExpr::getBitCast(C, SrcIVTy); 737302d80490feabfc8a01bee0fa698aab55169544Chris Lattner CDV = cast<ConstantDataVector>(C); 7404594aeffa3360882eb09a888a0970321b987b16Rafael Espindola } 7504594aeffa3360882eb09a888a0970321b987b16Rafael Espindola 7604594aeffa3360882eb09a888a0970321b987b16Rafael Espindola // Now that we know that the input value is a vector of integers, just shift 7704594aeffa3360882eb09a888a0970321b987b16Rafael Espindola // and insert them into our result. 787302d80490feabfc8a01bee0fa698aab55169544Chris Lattner unsigned BitShift = TD.getTypeAllocSizeInBits(SrcEltTy); 7904594aeffa3360882eb09a888a0970321b987b16Rafael Espindola APInt Result(IT->getBitWidth(), 0); 8004594aeffa3360882eb09a888a0970321b987b16Rafael Espindola for (unsigned i = 0; i != NumSrcElts; ++i) { 817302d80490feabfc8a01bee0fa698aab55169544Chris Lattner Result <<= BitShift; 827302d80490feabfc8a01bee0fa698aab55169544Chris Lattner if (TD.isLittleEndian()) 837302d80490feabfc8a01bee0fa698aab55169544Chris Lattner Result |= CDV->getElementAsInteger(NumSrcElts-i-1); 847302d80490feabfc8a01bee0fa698aab55169544Chris Lattner else 857302d80490feabfc8a01bee0fa698aab55169544Chris Lattner Result |= CDV->getElementAsInteger(i); 8604594aeffa3360882eb09a888a0970321b987b16Rafael Espindola } 8704594aeffa3360882eb09a888a0970321b987b16Rafael Espindola 8804594aeffa3360882eb09a888a0970321b987b16Rafael Espindola return ConstantInt::get(IT, Result); 8904594aeffa3360882eb09a888a0970321b987b16Rafael Espindola } 9004594aeffa3360882eb09a888a0970321b987b16Rafael Espindola 911c9fe0361b3f9f5c814ce761b97ecd11637a1d7dNadav Rotem // The code below only handles casts to vectors currently. 92db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner VectorType *DestVTy = dyn_cast<VectorType>(DestTy); 936333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner if (DestVTy == 0) 946333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner return ConstantExpr::getBitCast(C, DestTy); 956333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 9693798daa3ecbfb29624052d3e54d2404ab65897aChris Lattner // If this is a scalar -> vector cast, convert the input into a <1 x scalar> 9793798daa3ecbfb29624052d3e54d2404ab65897aChris Lattner // vector so the code below can handle it uniformly. 9893798daa3ecbfb29624052d3e54d2404ab65897aChris Lattner if (isa<ConstantFP>(C) || isa<ConstantInt>(C)) { 9993798daa3ecbfb29624052d3e54d2404ab65897aChris Lattner Constant *Ops = C; // don't take the address of C! 1002ca5c8644e6c35b3a7910a576ed89cddb7b82c3bChris Lattner return FoldBitCast(ConstantVector::get(Ops), DestTy, TD); 10193798daa3ecbfb29624052d3e54d2404ab65897aChris Lattner } 10293798daa3ecbfb29624052d3e54d2404ab65897aChris Lattner 10393798daa3ecbfb29624052d3e54d2404ab65897aChris Lattner // If this is a bitcast from constant vector -> vector, fold it. 1046b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner if (!isa<ConstantDataVector>(C) && !isa<ConstantVector>(C)) 10593798daa3ecbfb29624052d3e54d2404ab65897aChris Lattner return ConstantExpr::getBitCast(C, DestTy); 10693798daa3ecbfb29624052d3e54d2404ab65897aChris Lattner 1076333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // If the element types match, VMCore can fold it. 1086333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner unsigned NumDstElt = DestVTy->getNumElements(); 1096b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner unsigned NumSrcElt = C->getType()->getVectorNumElements(); 1106333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner if (NumDstElt == NumSrcElt) 1116333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner return ConstantExpr::getBitCast(C, DestTy); 1126333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 1136b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner Type *SrcEltTy = C->getType()->getVectorElementType(); 114db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *DstEltTy = DestVTy->getElementType(); 1156333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 1166333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Otherwise, we're changing the number of elements in a vector, which 1176333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // requires endianness information to do the right thing. For example, 1186333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // bitcast (<2 x i64> <i64 0, i64 1> to <4 x i32>) 1196333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // folds to (little endian): 1206333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // <4 x i32> <i32 0, i32 0, i32 1, i32 0> 1216333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // and to (big endian): 1226333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // <4 x i32> <i32 0, i32 0, i32 0, i32 1> 1236333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 1246333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // First thing is first. We only want to think about integer here, so if 1256333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // we have something in FP form, recast it as integer. 126b0bc6c361da9009e8414efde317d9bbff755f6c0Duncan Sands if (DstEltTy->isFloatingPointTy()) { 1276333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Fold to an vector of integers with same size as our FP type. 1286333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner unsigned FPWidth = DstEltTy->getPrimitiveSizeInBits(); 129db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *DestIVTy = 1306333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner VectorType::get(IntegerType::get(C->getContext(), FPWidth), NumDstElt); 1316333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Recursively handle this integer conversion, if possible. 1326333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner C = FoldBitCast(C, DestIVTy, TD); 1336333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 1346333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Finally, VMCore can handle this now that #elts line up. 1356333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner return ConstantExpr::getBitCast(C, DestTy); 1366333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner } 1376333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 1386333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Okay, we know the destination is integer, if the input is FP, convert 1396333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // it to integer first. 140b0bc6c361da9009e8414efde317d9bbff755f6c0Duncan Sands if (SrcEltTy->isFloatingPointTy()) { 1416333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner unsigned FPWidth = SrcEltTy->getPrimitiveSizeInBits(); 142db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *SrcIVTy = 1436333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner VectorType::get(IntegerType::get(C->getContext(), FPWidth), NumSrcElt); 1446333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Ask VMCore to do the conversion now that #elts line up. 1456333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner C = ConstantExpr::getBitCast(C, SrcIVTy); 1466b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner // If VMCore wasn't able to fold it, bail out. 1476b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner if (!isa<ConstantVector>(C) && // FIXME: Remove ConstantVector. 1486b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner !isa<ConstantDataVector>(C)) 1496333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner return C; 1506333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner } 1516333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 1526333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Now we know that the input and output vectors are both integer vectors 1536333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // of the same size, and that their #elements is not the same. Do the 1546333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // conversion here, which depends on whether the input or output has 1556333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // more elements. 1566333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner bool isLittleEndian = TD.isLittleEndian(); 1576333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 1586333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner SmallVector<Constant*, 32> Result; 1596333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner if (NumDstElt < NumSrcElt) { 1606333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Handle: bitcast (<4 x i32> <i32 0, i32 1, i32 2, i32 3> to <2 x i64>) 1616333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner Constant *Zero = Constant::getNullValue(DstEltTy); 1626333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner unsigned Ratio = NumSrcElt/NumDstElt; 1636333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner unsigned SrcBitSize = SrcEltTy->getPrimitiveSizeInBits(); 1646333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner unsigned SrcElt = 0; 1656333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner for (unsigned i = 0; i != NumDstElt; ++i) { 1666333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Build each element of the result. 1676333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner Constant *Elt = Zero; 1686333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner unsigned ShiftAmt = isLittleEndian ? 0 : SrcBitSize*(Ratio-1); 1696333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner for (unsigned j = 0; j != Ratio; ++j) { 1706b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner Constant *Src =dyn_cast<ConstantInt>(C->getAggregateElement(SrcElt++)); 1716333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner if (!Src) // Reject constantexpr elements. 1726333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner return ConstantExpr::getBitCast(C, DestTy); 1736333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 1746333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Zero extend the element to the right size. 1756333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner Src = ConstantExpr::getZExt(Src, Elt->getType()); 1766333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 1776333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Shift it to the right place, depending on endianness. 1786333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner Src = ConstantExpr::getShl(Src, 1796333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner ConstantInt::get(Src->getType(), ShiftAmt)); 1806333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner ShiftAmt += isLittleEndian ? SrcBitSize : -SrcBitSize; 1816333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 1826333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner // Mix it in. 1836333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner Elt = ConstantExpr::getOr(Elt, Src); 1846333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner } 1856333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner Result.push_back(Elt); 1866333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner } 1876b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner return ConstantVector::get(Result); 1886b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner } 1896b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner 1906b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner // Handle: bitcast (<2 x i64> <i64 0, i64 1> to <4 x i32>) 1916b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner unsigned Ratio = NumDstElt/NumSrcElt; 1926b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner unsigned DstBitSize = DstEltTy->getPrimitiveSizeInBits(); 1936b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner 1946b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner // Loop over each source value, expanding into multiple results. 1956b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner for (unsigned i = 0; i != NumSrcElt; ++i) { 1966b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner Constant *Src = dyn_cast<ConstantInt>(C->getAggregateElement(i)); 1976b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner if (!Src) // Reject constantexpr elements. 1986b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner return ConstantExpr::getBitCast(C, DestTy); 1996333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 2006b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner unsigned ShiftAmt = isLittleEndian ? 0 : DstBitSize*(Ratio-1); 2016b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner for (unsigned j = 0; j != Ratio; ++j) { 2026b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner // Shift the piece of the value into the right place, depending on 2036b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner // endianness. 2046b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner Constant *Elt = ConstantExpr::getLShr(Src, 2056b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner ConstantInt::get(Src->getType(), ShiftAmt)); 2066b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner ShiftAmt += isLittleEndian ? DstBitSize : -DstBitSize; 2076333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 2086b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner // Truncate and remember this piece. 2096b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner Result.push_back(ConstantExpr::getTrunc(Elt, DstEltTy)); 2106333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner } 2116333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner } 2126333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 2132ca5c8644e6c35b3a7910a576ed89cddb7b82c3bChris Lattner return ConstantVector::get(Result); 2146333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner} 2156333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 2166333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner 21703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// IsConstantOffsetFromGlobal - If this constant is actually a constant offset 21803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// from a global, return the global and the constant. Because of 21903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// constantexprs, this function is recursive. 22003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattnerstatic bool IsConstantOffsetFromGlobal(Constant *C, GlobalValue *&GV, 22103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner int64_t &Offset, const TargetData &TD) { 22203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Trivial case, constant is the global. 22303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if ((GV = dyn_cast<GlobalValue>(C))) { 22403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner Offset = 0; 22503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return true; 22603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 22703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 22803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Otherwise, if this isn't a constant expr, bail out. 22903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner ConstantExpr *CE = dyn_cast<ConstantExpr>(C); 23003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (!CE) return false; 23103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 23203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Look through ptr->int and ptr->ptr casts. 23303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (CE->getOpcode() == Instruction::PtrToInt || 23403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner CE->getOpcode() == Instruction::BitCast) 23503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return IsConstantOffsetFromGlobal(CE->getOperand(0), GV, Offset, TD); 23603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 23703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // i32* getelementptr ([5 x i32]* @a, i32 0, i32 5) 23803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (CE->getOpcode() == Instruction::GetElementPtr) { 23903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Cannot compute this if the element type of the pointer is missing size 24003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // info. 241f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner if (!cast<PointerType>(CE->getOperand(0)->getType()) 242f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner ->getElementType()->isSized()) 24303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return false; 24403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 24503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // If the base isn't a global+constant, we aren't either. 24603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (!IsConstantOffsetFromGlobal(CE->getOperand(0), GV, Offset, TD)) 24703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return false; 24803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 24903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Otherwise, add any offset that our operands provide. 25003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner gep_type_iterator GTI = gep_type_begin(CE); 251de2d74b213844b17eb5327fba27f21e699d3af66Gabor Greif for (User::const_op_iterator i = CE->op_begin() + 1, e = CE->op_end(); 252785c6af9797fcf551feef70f2ecb5cd075b6e3c4Gabor Greif i != e; ++i, ++GTI) { 253de2d74b213844b17eb5327fba27f21e699d3af66Gabor Greif ConstantInt *CI = dyn_cast<ConstantInt>(*i); 25403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (!CI) return false; // Index isn't a simple constant? 255e368b460a206fafa0d31d5d059b1779b94f7df8cDan Gohman if (CI->isZero()) continue; // Not adding anything. 25603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 257db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner if (StructType *ST = dyn_cast<StructType>(*GTI)) { 25803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // N = N + Offset 259b1919e2f08ecb37140af676fd2916f8d5ed7df3dChris Lattner Offset += TD.getStructLayout(ST)->getElementOffset(CI->getZExtValue()); 26003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } else { 261db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner SequentialType *SQT = cast<SequentialType>(*GTI); 262777d2306b36816a53bc1ae1244c0dc7d998ae691Duncan Sands Offset += TD.getTypeAllocSize(SQT->getElementType())*CI->getSExtValue(); 26303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 26403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 26503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return true; 26603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 26703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 26803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return false; 26903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner} 27003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 271fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner/// ReadDataFromGlobal - Recursive helper to read bits out of global. C is the 272fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner/// constant being copied out of. ByteOffset is an offset into C. CurPtr is the 273fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner/// pointer to copy results into and BytesLeft is the number of bytes left in 274fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner/// the CurPtr buffer. TD is the target data. 275fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattnerstatic bool ReadDataFromGlobal(Constant *C, uint64_t ByteOffset, 276fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner unsigned char *CurPtr, unsigned BytesLeft, 277fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner const TargetData &TD) { 278fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner assert(ByteOffset <= TD.getTypeAllocSize(C->getType()) && 279fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner "Out of range access"); 280fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 281c7b1382e351249774be63bd73839e8a0671635e1Chris Lattner // If this element is zero or undefined, we can just return since *CurPtr is 282c7b1382e351249774be63bd73839e8a0671635e1Chris Lattner // zero initialized. 283fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (isa<ConstantAggregateZero>(C) || isa<UndefValue>(C)) 284fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return true; 285fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 286fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (ConstantInt *CI = dyn_cast<ConstantInt>(C)) { 287fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (CI->getBitWidth() > 64 || 288fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner (CI->getBitWidth() & 7) != 0) 289fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return false; 290fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 291fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner uint64_t Val = CI->getZExtValue(); 292fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner unsigned IntBytes = unsigned(CI->getBitWidth()/8); 293fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 294fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner for (unsigned i = 0; i != BytesLeft && ByteOffset != IntBytes; ++i) { 295c7b1382e351249774be63bd73839e8a0671635e1Chris Lattner CurPtr[i] = (unsigned char)(Val >> (ByteOffset * 8)); 296fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner ++ByteOffset; 297fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 298fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return true; 299fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 300fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 301fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 302fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (CFP->getType()->isDoubleTy()) { 3036333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner C = FoldBitCast(C, Type::getInt64Ty(C->getContext()), TD); 304fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return ReadDataFromGlobal(C, ByteOffset, CurPtr, BytesLeft, TD); 305fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 306fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (CFP->getType()->isFloatTy()){ 3076333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner C = FoldBitCast(C, Type::getInt32Ty(C->getContext()), TD); 308fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return ReadDataFromGlobal(C, ByteOffset, CurPtr, BytesLeft, TD); 309fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 310c7b1382e351249774be63bd73839e8a0671635e1Chris Lattner return false; 311fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 312a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner 313fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) { 314fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner const StructLayout *SL = TD.getStructLayout(CS->getType()); 315fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner unsigned Index = SL->getElementContainingOffset(ByteOffset); 316fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner uint64_t CurEltOffset = SL->getElementOffset(Index); 317fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner ByteOffset -= CurEltOffset; 318fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 319fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner while (1) { 320fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // If the element access is to the element itself and not to tail padding, 321fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // read the bytes from the element. 322fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner uint64_t EltSize = TD.getTypeAllocSize(CS->getOperand(Index)->getType()); 323fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 324fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (ByteOffset < EltSize && 325fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner !ReadDataFromGlobal(CS->getOperand(Index), ByteOffset, CurPtr, 326fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner BytesLeft, TD)) 327fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return false; 328fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 329fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner ++Index; 330fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 331fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // Check to see if we read from the last struct element, if so we're done. 332fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (Index == CS->getType()->getNumElements()) 333fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return true; 334fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 335fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // If we read all of the bytes we needed from this element we're done. 336fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner uint64_t NextEltOffset = SL->getElementOffset(Index); 337fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 338fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (BytesLeft <= NextEltOffset-CurEltOffset-ByteOffset) 339fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return true; 340fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 341fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // Move to the next element of the struct. 342c5af649758ac8c6ffb896d7d5c570640a9fa1deeChris Lattner CurPtr += NextEltOffset-CurEltOffset-ByteOffset; 343fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner BytesLeft -= NextEltOffset-CurEltOffset-ByteOffset; 344fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner ByteOffset = 0; 345fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner CurEltOffset = NextEltOffset; 346fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 347fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // not reached. 348fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 349fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 350a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner if (isa<ConstantArray>(C) || isa<ConstantVector>(C) || 351a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner isa<ConstantDataSequential>(C)) { 352a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner Type *EltTy = cast<SequentialType>(C->getType())->getElementType(); 353a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner uint64_t EltSize = TD.getTypeAllocSize(EltTy); 354fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner uint64_t Index = ByteOffset / EltSize; 355fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner uint64_t Offset = ByteOffset - Index * EltSize; 356a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner uint64_t NumElts; 357a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner if (ArrayType *AT = dyn_cast<ArrayType>(C->getType())) 358a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner NumElts = AT->getNumElements(); 359a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner else 360a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner NumElts = cast<VectorType>(C->getType())->getNumElements(); 361a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner 362a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner for (; Index != NumElts; ++Index) { 363a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner if (!ReadDataFromGlobal(C->getAggregateElement(Index), Offset, CurPtr, 364fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner BytesLeft, TD)) 365fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return false; 366fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (EltSize >= BytesLeft) 367fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return true; 368fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 369fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner Offset = 0; 370fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner BytesLeft -= EltSize; 371fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner CurPtr += EltSize; 372fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 373fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return true; 374fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 375a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner 3766475d9434ff3e981160f85d3f1aa07c9e0ace6f2Anders Carlsson if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 3775d43ff4e7ea30eaf5a1c417f0ec528900f5c83f2Anders Carlsson if (CE->getOpcode() == Instruction::IntToPtr && 3785d43ff4e7ea30eaf5a1c417f0ec528900f5c83f2Anders Carlsson CE->getOperand(0)->getType() == TD.getIntPtrType(CE->getContext())) 379a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner return ReadDataFromGlobal(CE->getOperand(0), ByteOffset, CurPtr, 380a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner BytesLeft, TD); 3816475d9434ff3e981160f85d3f1aa07c9e0ace6f2Anders Carlsson } 3826475d9434ff3e981160f85d3f1aa07c9e0ace6f2Anders Carlsson 383fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // Otherwise, unknown initializer type. 384fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return false; 385fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner} 386fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 387fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattnerstatic Constant *FoldReinterpretLoadFromConstPtr(Constant *C, 388fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner const TargetData &TD) { 389db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *LoadTy = cast<PointerType>(C->getType())->getElementType(); 390db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner IntegerType *IntType = dyn_cast<IntegerType>(LoadTy); 391fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 392fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // If this isn't an integer load we can't fold it directly. 393fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (!IntType) { 394fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // If this is a float/double load, we can try folding it as an int32/64 load 39517f0cd3cc1432231f2bc5601e7e463986a59d817Chris Lattner // and then bitcast the result. This can be useful for union cases. Note 39617f0cd3cc1432231f2bc5601e7e463986a59d817Chris Lattner // that address spaces don't matter here since we're not going to result in 39717f0cd3cc1432231f2bc5601e7e463986a59d817Chris Lattner // an actual new load. 398db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *MapTy; 39917f0cd3cc1432231f2bc5601e7e463986a59d817Chris Lattner if (LoadTy->isFloatTy()) 400fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner MapTy = Type::getInt32PtrTy(C->getContext()); 40117f0cd3cc1432231f2bc5601e7e463986a59d817Chris Lattner else if (LoadTy->isDoubleTy()) 402fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner MapTy = Type::getInt64PtrTy(C->getContext()); 4031df9859c40492511b8aa4321eb76496005d3b75bDuncan Sands else if (LoadTy->isVectorTy()) { 40417f0cd3cc1432231f2bc5601e7e463986a59d817Chris Lattner MapTy = IntegerType::get(C->getContext(), 40517f0cd3cc1432231f2bc5601e7e463986a59d817Chris Lattner TD.getTypeAllocSizeInBits(LoadTy)); 40617f0cd3cc1432231f2bc5601e7e463986a59d817Chris Lattner MapTy = PointerType::getUnqual(MapTy); 40717f0cd3cc1432231f2bc5601e7e463986a59d817Chris Lattner } else 408fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return 0; 409fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 4106333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner C = FoldBitCast(C, MapTy, TD); 411fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (Constant *Res = FoldReinterpretLoadFromConstPtr(C, TD)) 4126333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner return FoldBitCast(Res, LoadTy, TD); 413fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return 0; 414fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner } 415fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 416fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner unsigned BytesLoaded = (IntType->getBitWidth() + 7) / 8; 417739208a790398cf1f9da05149c768371e48781e8Chris Lattner if (BytesLoaded > 32 || BytesLoaded == 0) return 0; 418fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 419fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner GlobalValue *GVal; 420fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner int64_t Offset; 421fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (!IsConstantOffsetFromGlobal(C, GVal, Offset, TD)) 422fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return 0; 423fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 424fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner GlobalVariable *GV = dyn_cast<GlobalVariable>(GVal); 425c7b1382e351249774be63bd73839e8a0671635e1Chris Lattner if (!GV || !GV->isConstant() || !GV->hasDefinitiveInitializer() || 426fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner !GV->getInitializer()->getType()->isSized()) 427fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return 0; 428fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 429fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // If we're loading off the beginning of the global, some bytes may be valid, 430fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // but we don't try to handle this. 431fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (Offset < 0) return 0; 432fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 433fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // If we're not accessing anything in this constant, the result is undefined. 434fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (uint64_t(Offset) >= TD.getTypeAllocSize(GV->getInitializer()->getType())) 435fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return UndefValue::get(IntType); 436fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 437739208a790398cf1f9da05149c768371e48781e8Chris Lattner unsigned char RawBytes[32] = {0}; 438fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (!ReadDataFromGlobal(GV->getInitializer(), Offset, RawBytes, 439fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner BytesLoaded, TD)) 440fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return 0; 441fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 442b31189f26297fe30214da3e8d14a4575d5fdd262Chris Lattner APInt ResultVal = APInt(IntType->getBitWidth(), RawBytes[BytesLoaded-1]); 443b31189f26297fe30214da3e8d14a4575d5fdd262Chris Lattner for (unsigned i = 1; i != BytesLoaded; ++i) { 444739208a790398cf1f9da05149c768371e48781e8Chris Lattner ResultVal <<= 8; 445ce800511701135ed86845b451693a248c83a7973Dan Gohman ResultVal |= RawBytes[BytesLoaded-1-i]; 446739208a790398cf1f9da05149c768371e48781e8Chris Lattner } 447fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 448739208a790398cf1f9da05149c768371e48781e8Chris Lattner return ConstantInt::get(IntType->getContext(), ResultVal); 449fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner} 450fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 451878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner/// ConstantFoldLoadFromConstPtr - Return the value that a load from C would 452878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner/// produce if it is constant and determinable. If this is not determinable, 453878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner/// return null. 454878e4946700824954d7eb7f3ff660353db8e0d17Chris LattnerConstant *llvm::ConstantFoldLoadFromConstPtr(Constant *C, 455878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner const TargetData *TD) { 456878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner // First, try the easy cases: 457878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) 458878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner if (GV->isConstant() && GV->hasDefinitiveInitializer()) 459878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner return GV->getInitializer(); 460878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner 461e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner // If the loaded value isn't a constant expr, we can't handle it. 462e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner ConstantExpr *CE = dyn_cast<ConstantExpr>(C); 463e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner if (!CE) return 0; 464e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner 465e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner if (CE->getOpcode() == Instruction::GetElementPtr) { 466e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner if (GlobalVariable *GV = dyn_cast<GlobalVariable>(CE->getOperand(0))) 467e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner if (GV->isConstant() && GV->hasDefinitiveInitializer()) 468e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner if (Constant *V = 469e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner ConstantFoldLoadThroughGEPConstantExpr(GV->getInitializer(), CE)) 470e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner return V; 471e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner } 472e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner 473e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner // Instead of loading constant c string, use corresponding integer value 474e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner // directly if string length is small enough. 47518c7f80b3e83ab584bd8572695a3cde8bafd9d3cChris Lattner StringRef Str; 47618c7f80b3e83ab584bd8572695a3cde8bafd9d3cChris Lattner if (TD && getConstantStringInfo(CE, Str) && !Str.empty()) { 47718c7f80b3e83ab584bd8572695a3cde8bafd9d3cChris Lattner unsigned StrLen = Str.size(); 478db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *Ty = cast<PointerType>(CE->getType())->getElementType(); 479fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner unsigned NumBits = Ty->getPrimitiveSizeInBits(); 480eae2895120500d06bf6de9725efeeff498f60385Chris Lattner // Replace load with immediate integer if the result is an integer or fp 481eae2895120500d06bf6de9725efeeff498f60385Chris Lattner // value. 482eae2895120500d06bf6de9725efeeff498f60385Chris Lattner if ((NumBits >> 3) == StrLen + 1 && (NumBits & 7) == 0 && 483490b8f5d64823d998fc12ad3a91ecacd82c1901eChandler Carruth (isa<IntegerType>(Ty) || Ty->isFloatingPointTy())) { 484fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner APInt StrVal(NumBits, 0); 485fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner APInt SingleChar(NumBits, 0); 486e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner if (TD->isLittleEndian()) { 487fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner for (signed i = StrLen-1; i >= 0; i--) { 488e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner SingleChar = (uint64_t) Str[i] & UCHAR_MAX; 48962d327e241f59735eed836e98c8f11ffaa6cf6f8Chris Lattner StrVal = (StrVal << 8) | SingleChar; 49062d327e241f59735eed836e98c8f11ffaa6cf6f8Chris Lattner } 491e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner } else { 492fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner for (unsigned i = 0; i < StrLen; i++) { 493e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner SingleChar = (uint64_t) Str[i] & UCHAR_MAX; 494e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner StrVal = (StrVal << 8) | SingleChar; 495e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner } 496e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner // Append NULL at the end. 497e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner SingleChar = 0; 498e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner StrVal = (StrVal << 8) | SingleChar; 49962d327e241f59735eed836e98c8f11ffaa6cf6f8Chris Lattner } 500eae2895120500d06bf6de9725efeeff498f60385Chris Lattner 501eae2895120500d06bf6de9725efeeff498f60385Chris Lattner Constant *Res = ConstantInt::get(CE->getContext(), StrVal); 502eae2895120500d06bf6de9725efeeff498f60385Chris Lattner if (Ty->isFloatingPointTy()) 503eae2895120500d06bf6de9725efeeff498f60385Chris Lattner Res = ConstantExpr::getBitCast(Res, Ty); 504eae2895120500d06bf6de9725efeeff498f60385Chris Lattner return Res; 50562d327e241f59735eed836e98c8f11ffaa6cf6f8Chris Lattner } 506878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner } 507e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner 508e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner // If this load comes from anywhere in a constant global, and if the global 509e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner // is all undef or zero, we know what it loads. 510bd1801b5553c8be3960255a92738464e0010b6f6Dan Gohman if (GlobalVariable *GV = 511bd1801b5553c8be3960255a92738464e0010b6f6Dan Gohman dyn_cast<GlobalVariable>(GetUnderlyingObject(CE, TD))) { 512e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner if (GV->isConstant() && GV->hasDefinitiveInitializer()) { 513db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *ResTy = cast<PointerType>(C->getType())->getElementType(); 514e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner if (GV->getInitializer()->isNullValue()) 515e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner return Constant::getNullValue(ResTy); 516e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner if (isa<UndefValue>(GV->getInitializer())) 517e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner return UndefValue::get(ResTy); 518e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner } 519e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner } 520e00c43fc35d64b2ee8d2b4692c02375d2d7b4aa4Chris Lattner 521fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // Try hard to fold loads from bitcasted strange and non-type-safe things. We 522fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // currently don't do any of this for big endian systems. It can be 523fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner // generalized in the future if someone is interested. 524fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner if (TD && TD->isLittleEndian()) 525fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner return FoldReinterpretLoadFromConstPtr(CE, *TD); 526878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner return 0; 527878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner} 528878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner 529878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattnerstatic Constant *ConstantFoldLoadInst(const LoadInst *LI, const TargetData *TD){ 530878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner if (LI->isVolatile()) return 0; 531878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner 532878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner if (Constant *C = dyn_cast<Constant>(LI->getOperand(0))) 533878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner return ConstantFoldLoadFromConstPtr(C, TD); 534fe8c7c807c6f815561bc2bdddfd330b05dbdfc93Chris Lattner 535878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner return 0; 536878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner} 53703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 53803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// SymbolicallyEvaluateBinop - One of Op0/Op1 is a constant expression. 53967e3566d8f6875e9c92d224f493023408a66227eNick Lewycky/// Attempt to symbolically evaluate the result of a binary operator merging 54003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// these together. If target data info is available, it is provided as TD, 54103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// otherwise TD is null. 54203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattnerstatic Constant *SymbolicallyEvaluateBinop(unsigned Opc, Constant *Op0, 5437b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner Constant *Op1, const TargetData *TD){ 54403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // SROA 54503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 54603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Fold (and 0xffffffff00000000, (shl x, 32)) -> shl. 54703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Fold (lshr (or X, Y), 32) -> (lshr [X/Y], 32) if one doesn't contribute 54803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // bits. 54903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 55003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 55103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // If the constant expr is something like &A[123] - &A[4].f, fold this into a 55203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // constant. This happens frequently when iterating over a global array. 55303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (Opc == Instruction::Sub && TD) { 55403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner GlobalValue *GV1, *GV2; 55503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner int64_t Offs1, Offs2; 55603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 55703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (IsConstantOffsetFromGlobal(Op0, GV1, Offs1, *TD)) 55803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (IsConstantOffsetFromGlobal(Op1, GV2, Offs2, *TD) && 55903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner GV1 == GV2) { 56003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // (&GV+C1) - (&GV+C2) -> C1-C2, pointer arithmetic cannot overflow. 561eed707b1e6097aac2bb6b3d47271f6300ace7f2eOwen Anderson return ConstantInt::get(Op0->getType(), Offs1-Offs2); 56203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 56303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 56403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 56503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return 0; 56603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner} 56703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 5684f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman/// CastGEPIndices - If array indices are not pointer-sized integers, 5694f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman/// explicitly cast them so that they aren't implicitly casted by the 5704f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman/// getelementptr. 5711d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foadstatic Constant *CastGEPIndices(ArrayRef<Constant *> Ops, 572618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier Type *ResultTy, const TargetData *TD, 573618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier const TargetLibraryInfo *TLI) { 5744f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman if (!TD) return 0; 575db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *IntPtrTy = TD->getIntPtrType(ResultTy->getContext()); 5764f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman 5774f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman bool Any = false; 5784f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman SmallVector<Constant*, 32> NewIdxs; 5791d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foad for (unsigned i = 1, e = Ops.size(); i != e; ++i) { 5804f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman if ((i == 1 || 5814f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman !isa<StructType>(GetElementPtrInst::getIndexedType(Ops[0]->getType(), 582a9203109f4ac95aa7e9624f2838e3d89623ec902Jay Foad Ops.slice(1, i-1)))) && 5834f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman Ops[i]->getType() != IntPtrTy) { 5844f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman Any = true; 5854f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman NewIdxs.push_back(ConstantExpr::getCast(CastInst::getCastOpcode(Ops[i], 5864f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman true, 5874f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman IntPtrTy, 5884f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman true), 5894f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman Ops[i], IntPtrTy)); 5904f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman } else 5914f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman NewIdxs.push_back(Ops[i]); 5924f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman } 5934f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman if (!Any) return 0; 5944f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman 5954f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman Constant *C = 596dab3d29605a5c83db41b28176273ef55961120c1Jay Foad ConstantExpr::getGetElementPtr(Ops[0], NewIdxs); 5974f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) 598618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier if (Constant *Folded = ConstantFoldConstantExpression(CE, TD, TLI)) 5994f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman C = Folded; 6004f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman return C; 6014f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman} 6024f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman 60303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// SymbolicallyEvaluateGEP - If we can symbolically evaluate the specified GEP 60403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// constant expression, do so. 6051d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foadstatic Constant *SymbolicallyEvaluateGEP(ArrayRef<Constant *> Ops, 606618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier Type *ResultTy, const TargetData *TD, 607618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier const TargetLibraryInfo *TLI) { 60803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner Constant *Ptr = Ops[0]; 6091608769abeb1430dc34f31ffac0d9850f99ae36aNadav Rotem if (!TD || !cast<PointerType>(Ptr->getType())->getElementType()->isSized() || 6101608769abeb1430dc34f31ffac0d9850f99ae36aNadav Rotem !Ptr->getType()->isPointerTy()) 61103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return 0; 612f1cadf28991b2643128bfe38990ff235f2cb1491Chris Lattner 613db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *IntPtrTy = TD->getIntPtrType(Ptr->getContext()); 614268e7d7a9446bb89b80472cdb7b9803f16c0191eChris Lattner 615268e7d7a9446bb89b80472cdb7b9803f16c0191eChris Lattner // If this is a constant expr gep that is effectively computing an 616268e7d7a9446bb89b80472cdb7b9803f16c0191eChris Lattner // "offsetof", fold it into 'cast int Size to T*' instead of 'gep 0, 0, 12' 6171d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foad for (unsigned i = 1, e = Ops.size(); i != e; ++i) 6188cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner if (!isa<ConstantInt>(Ops[i])) { 6198cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner 6208cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner // If this is "gep i8* Ptr, (sub 0, V)", fold this as: 6218cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner // "inttoptr (sub (ptrtoint Ptr), V)" 6221d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foad if (Ops.size() == 2 && 6238cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner cast<PointerType>(ResultTy)->getElementType()->isIntegerTy(8)) { 6248cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner ConstantExpr *CE = dyn_cast<ConstantExpr>(Ops[1]); 625156eb0a569a1ebac86ad8438645f690d8a3894c4Chris Lattner assert((CE == 0 || CE->getType() == IntPtrTy) && 626f1cadf28991b2643128bfe38990ff235f2cb1491Chris Lattner "CastGEPIndices didn't canonicalize index types!"); 6278cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner if (CE && CE->getOpcode() == Instruction::Sub && 628f1cadf28991b2643128bfe38990ff235f2cb1491Chris Lattner CE->getOperand(0)->isNullValue()) { 6298cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner Constant *Res = ConstantExpr::getPtrToInt(Ptr, CE->getType()); 6308cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner Res = ConstantExpr::getSub(Res, CE->getOperand(1)); 6318cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner Res = ConstantExpr::getIntToPtr(Res, ResultTy); 6328cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner if (ConstantExpr *ResCE = dyn_cast<ConstantExpr>(Res)) 633618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier Res = ConstantFoldConstantExpression(ResCE, TD, TLI); 6348cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner return Res; 6358cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner } 6368cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner } 637de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman return 0; 6388cd4efb6a5e51b4e77039c17338f290ca3a8ee92Chris Lattner } 639268e7d7a9446bb89b80472cdb7b9803f16c0191eChris Lattner 640f1cadf28991b2643128bfe38990ff235f2cb1491Chris Lattner unsigned BitWidth = TD->getTypeSizeInBits(IntPtrTy); 6418fbbb3980755d74539a0aed02bc18842ed2bd18dJay Foad APInt Offset = 6428fbbb3980755d74539a0aed02bc18842ed2bd18dJay Foad APInt(BitWidth, TD->getIndexedOffset(Ptr->getType(), 6438fbbb3980755d74539a0aed02bc18842ed2bd18dJay Foad makeArrayRef((Value **)Ops.data() + 1, 6448fbbb3980755d74539a0aed02bc18842ed2bd18dJay Foad Ops.size() - 1))); 645890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands Ptr = cast<Constant>(Ptr->stripPointerCasts()); 6460891d752a68a25025ffc3339aab1f0ad3221b0edDan Gohman 6470891d752a68a25025ffc3339aab1f0ad3221b0edDan Gohman // If this is a GEP of a GEP, fold it all into a single GEP. 6480891d752a68a25025ffc3339aab1f0ad3221b0edDan Gohman while (GEPOperator *GEP = dyn_cast<GEPOperator>(Ptr)) { 6490891d752a68a25025ffc3339aab1f0ad3221b0edDan Gohman SmallVector<Value *, 4> NestedOps(GEP->op_begin()+1, GEP->op_end()); 650890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands 651890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands // Do not try the incorporate the sub-GEP if some index is not a number. 652890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands bool AllConstantInt = true; 653890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands for (unsigned i = 0, e = NestedOps.size(); i != e; ++i) 654890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands if (!isa<ConstantInt>(NestedOps[i])) { 655890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands AllConstantInt = false; 656890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands break; 657890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands } 658890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands if (!AllConstantInt) 659890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands break; 660890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands 6610891d752a68a25025ffc3339aab1f0ad3221b0edDan Gohman Ptr = cast<Constant>(GEP->getOperand(0)); 6620891d752a68a25025ffc3339aab1f0ad3221b0edDan Gohman Offset += APInt(BitWidth, 6638fbbb3980755d74539a0aed02bc18842ed2bd18dJay Foad TD->getIndexedOffset(Ptr->getType(), NestedOps)); 664890edda7c22dd8525f9fe44085cfd7080e67dfeeDuncan Sands Ptr = cast<Constant>(Ptr->stripPointerCasts()); 6650891d752a68a25025ffc3339aab1f0ad3221b0edDan Gohman } 6660891d752a68a25025ffc3339aab1f0ad3221b0edDan Gohman 667de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman // If the base value for this address is a literal integer value, fold the 668de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman // getelementptr to the resulting integer value casted to the pointer type. 66940b037ef611efc5c43ffc43a911d0eb57e0d444dDan Gohman APInt BasePtr(BitWidth, 0); 67040b037ef611efc5c43ffc43a911d0eb57e0d444dDan Gohman if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ptr)) 67140b037ef611efc5c43ffc43a911d0eb57e0d444dDan Gohman if (CE->getOpcode() == Instruction::IntToPtr) 67240f8f6264d5af2c38e797e0dc59827cd231e8ff7Jay Foad if (ConstantInt *Base = dyn_cast<ConstantInt>(CE->getOperand(0))) 67340f8f6264d5af2c38e797e0dc59827cd231e8ff7Jay Foad BasePtr = Base->getValue().zextOrTrunc(BitWidth); 67440b037ef611efc5c43ffc43a911d0eb57e0d444dDan Gohman if (Ptr->isNullValue() || BasePtr != 0) { 6757b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner Constant *C = ConstantInt::get(Ptr->getContext(), Offset+BasePtr); 676de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman return ConstantExpr::getIntToPtr(C, ResultTy); 677de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman } 678de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman 679de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman // Otherwise form a regular getelementptr. Recompute the indices so that 680de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman // we eliminate over-indexing of the notional static type array bounds. 681de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman // This makes it easy to determine if the getelementptr is "inbounds". 682de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman // Also, this helps GlobalOpt do SROA on GlobalVariables. 683db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *Ty = Ptr->getType(); 684de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman SmallVector<Constant*, 32> NewIdxs; 6853d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman do { 686db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner if (SequentialType *ATy = dyn_cast<SequentialType>(Ty)) { 6871df9859c40492511b8aa4321eb76496005d3b75bDuncan Sands if (ATy->isPointerTy()) { 688e568fa2d29c58aaedcaa832f805949d5e4371b4bChris Lattner // The only pointer indexing we'll do is on the first index of the GEP. 689e568fa2d29c58aaedcaa832f805949d5e4371b4bChris Lattner if (!NewIdxs.empty()) 690e568fa2d29c58aaedcaa832f805949d5e4371b4bChris Lattner break; 691e568fa2d29c58aaedcaa832f805949d5e4371b4bChris Lattner 692e568fa2d29c58aaedcaa832f805949d5e4371b4bChris Lattner // Only handle pointers to sized types, not pointers to functions. 693e568fa2d29c58aaedcaa832f805949d5e4371b4bChris Lattner if (!ATy->getElementType()->isSized()) 694e568fa2d29c58aaedcaa832f805949d5e4371b4bChris Lattner return 0; 695e568fa2d29c58aaedcaa832f805949d5e4371b4bChris Lattner } 696e568fa2d29c58aaedcaa832f805949d5e4371b4bChris Lattner 697de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman // Determine which element of the array the offset points into. 698cda9706cb74a65d2feb2175613cb0fe46acc5aa2Dan Gohman APInt ElemSize(BitWidth, TD->getTypeAllocSize(ATy->getElementType())); 699db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner IntegerType *IntPtrTy = TD->getIntPtrType(Ty->getContext()); 700de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman if (ElemSize == 0) 701c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner // The element size is 0. This may be [0 x Ty]*, so just use a zero 702e58391073f6e17cd1024f737618a6f6b8d1323ceDuncan Sands // index for this level and proceed to the next level to see if it can 703e58391073f6e17cd1024f737618a6f6b8d1323ceDuncan Sands // accommodate the offset. 704c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner NewIdxs.push_back(ConstantInt::get(IntPtrTy, 0)); 705c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner else { 706c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner // The element size is non-zero divide the offset by the element 707c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner // size (rounding down), to compute the index at this level. 708c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner APInt NewIdx = Offset.udiv(ElemSize); 709c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner Offset -= NewIdx * ElemSize; 710c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner NewIdxs.push_back(ConstantInt::get(IntPtrTy, NewIdx)); 711c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner } 712de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman Ty = ATy->getElementType(); 713db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner } else if (StructType *STy = dyn_cast<StructType>(Ty)) { 714cda9706cb74a65d2feb2175613cb0fe46acc5aa2Dan Gohman // Determine which field of the struct the offset points into. The 715cda9706cb74a65d2feb2175613cb0fe46acc5aa2Dan Gohman // getZExtValue is at least as safe as the StructLayout API because we 716cda9706cb74a65d2feb2175613cb0fe46acc5aa2Dan Gohman // know the offset is within the struct at this point. 717de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman const StructLayout &SL = *TD->getStructLayout(STy); 718cda9706cb74a65d2feb2175613cb0fe46acc5aa2Dan Gohman unsigned ElIdx = SL.getElementContainingOffset(Offset.getZExtValue()); 7197b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner NewIdxs.push_back(ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 7207b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner ElIdx)); 721cda9706cb74a65d2feb2175613cb0fe46acc5aa2Dan Gohman Offset -= APInt(BitWidth, SL.getElementOffset(ElIdx)); 722de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman Ty = STy->getTypeAtIndex(ElIdx); 723de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman } else { 7243d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman // We've reached some non-indexable type. 7253d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman break; 726de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman } 7273d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman } while (Ty != cast<PointerType>(ResultTy)->getElementType()); 7283d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman 7293d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman // If we haven't used up the entire offset by descending the static 7303d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman // type, then the offset is pointing into the middle of an indivisible 7313d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman // member, so we can't simplify it. 7323d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman if (Offset != 0) 7333d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman return 0; 734de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman 7353bfbc4587a7e79f08f8c126a9e62c3475fb90f8bDan Gohman // Create a GEP. 7363bfbc4587a7e79f08f8c126a9e62c3475fb90f8bDan Gohman Constant *C = 737dab3d29605a5c83db41b28176273ef55961120c1Jay Foad ConstantExpr::getGetElementPtr(Ptr, NewIdxs); 7386e7ad958683f34bf6c014c88fef723e5a2d741beDan Gohman assert(cast<PointerType>(C->getType())->getElementType() == Ty && 7396e7ad958683f34bf6c014c88fef723e5a2d741beDan Gohman "Computed GetElementPtr has unexpected type!"); 7403d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman 7413d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman // If we ended up indexing a member with a type that doesn't match 7424c0d5d5db876b0628bdf6a2174263a1c0a9130e2Dan Gohman // the type of what the original indices indexed, add a cast. 7433d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman if (Ty != cast<PointerType>(ResultTy)->getElementType()) 7446333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner C = FoldBitCast(C, ResultTy, *TD); 745de0e587e63f71afb2ac53c9880c262089fe798bbDan Gohman 7463d01334e6fa5caba1361d088fabf728c64b23c58Dan Gohman return C; 74703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner} 74803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 7491afab9c1e0ae2d145ce01718aa14065393117e70Chris Lattner 75003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 75103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner//===----------------------------------------------------------------------===// 75203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner// Constant Folding public APIs 75303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner//===----------------------------------------------------------------------===// 75403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 755b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands/// ConstantFoldInstruction - Try to constant fold the specified instruction. 756b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands/// If successful, the constant result is returned, if not, null is returned. 757b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands/// Note that this fails if not all of the operands are constant. Otherwise, 758b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands/// this function can only fail when attempting to fold instructions like loads 759b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands/// and stores, which have no constant expression form. 760618c1dbd293d15ee19f61b1156ab8086ad28311aChad RosierConstant *llvm::ConstantFoldInstruction(Instruction *I, 761618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier const TargetData *TD, 762618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier const TargetLibraryInfo *TLI) { 763b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands // Handle PHI nodes quickly here... 7645520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (PHINode *PN = dyn_cast<PHINode>(I)) { 765c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands Constant *CommonValue = 0; 766c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands 767c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) { 768c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands Value *Incoming = PN->getIncomingValue(i); 769b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands // If the incoming value is undef then skip it. Note that while we could 770b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands // skip the value if it is equal to the phi node itself we choose not to 771b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands // because that would break the rule that constant folding only applies if 772b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands // all operands are constants. 773b9b369fa9983843c4ed77b3a35b6e9b7933955bbDuncan Sands if (isa<UndefValue>(Incoming)) 774c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands continue; 775c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands // If the incoming value is not a constant, or is a different constant to 776c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands // the one we saw previously, then give up. 777c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands Constant *C = dyn_cast<Constant>(Incoming); 778c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands if (!C || (CommonValue && C != CommonValue)) 779c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands return 0; 780c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands CommonValue = C; 781c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands } 7825520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 783c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands // If we reach here, all incoming values are the same constant or undef. 784c0362d5c6e0066c741bce056a65d8b4c026de19fDuncan Sands return CommonValue ? CommonValue : UndefValue::get(PN->getType()); 7855520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner } 7865520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 7875520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner // Scan the operand list, checking to see if they are all constants, if so, 7885520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner // hand off to ConstantFoldInstOperands. 7895520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner SmallVector<Constant*, 8> Ops; 790de2d74b213844b17eb5327fba27f21e699d3af66Gabor Greif for (User::op_iterator i = I->op_begin(), e = I->op_end(); i != e; ++i) 791de2d74b213844b17eb5327fba27f21e699d3af66Gabor Greif if (Constant *Op = dyn_cast<Constant>(*i)) 7925520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner Ops.push_back(Op); 7935520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner else 7945520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return 0; // All operands not constant! 7955520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 796f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner if (const CmpInst *CI = dyn_cast<CmpInst>(I)) 7978f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner return ConstantFoldCompareInstOperands(CI->getPredicate(), Ops[0], Ops[1], 798618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier TD, TLI); 79958665d47aea69875c433fb039c8f10106abc1ceeChris Lattner 800878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner if (const LoadInst *LI = dyn_cast<LoadInst>(I)) 801878e4946700824954d7eb7f3ff660353db8e0d17Chris Lattner return ConstantFoldLoadInst(LI, TD); 8023ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel 8033ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel if (InsertValueInst *IVI = dyn_cast<InsertValueInst>(I)) 8043ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel return ConstantExpr::getInsertValue( 8053ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel cast<Constant>(IVI->getAggregateOperand()), 8063ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel cast<Constant>(IVI->getInsertedValueOperand()), 807fc6d3a49867cd38954dc40936a88f1907252c6d2Jay Foad IVI->getIndices()); 8083ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel 8093ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel if (ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(I)) 8103ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel return ConstantExpr::getExtractValue( 8113ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel cast<Constant>(EVI->getAggregateOperand()), 812fc6d3a49867cd38954dc40936a88f1907252c6d2Jay Foad EVI->getIndices()); 8133ee0af35842999c1781052fe74fdcb19997de950Frits van Bommel 814618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier return ConstantFoldInstOperands(I->getOpcode(), I->getType(), Ops, TD, TLI); 8155520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner} 8165520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 8173dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky/// ConstantFoldConstantExpression - Attempt to fold the constant expression 8183dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky/// using the specified TargetData. If successful, the constant result is 8193dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky/// result is returned, if not, null is returned. 820baf0c67988feec5b7698f89dce499ddb7d0c3c42Dan GohmanConstant *llvm::ConstantFoldConstantExpression(const ConstantExpr *CE, 821618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier const TargetData *TD, 822618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier const TargetLibraryInfo *TLI) { 8233dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky SmallVector<Constant*, 8> Ops; 824c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner for (User::const_op_iterator i = CE->op_begin(), e = CE->op_end(); 825c1da204c433459713cbf4c62f0addf458e6b4b9fChris Lattner i != e; ++i) { 82601b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman Constant *NewC = cast<Constant>(*i); 82701b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman // Recursively fold the ConstantExpr's operands. 82801b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman if (ConstantExpr *NewCE = dyn_cast<ConstantExpr>(NewC)) 829618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier NewC = ConstantFoldConstantExpression(NewCE, TD, TLI); 83001b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman Ops.push_back(NewC); 83101b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman } 8323dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky 8333dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky if (CE->isCompare()) 8348f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner return ConstantFoldCompareInstOperands(CE->getPredicate(), Ops[0], Ops[1], 835618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier TD, TLI); 836618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier return ConstantFoldInstOperands(CE->getOpcode(), CE->getType(), Ops, TD, TLI); 8373dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky} 8383dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky 8395520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// ConstantFoldInstOperands - Attempt to constant fold an instruction with the 8405520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// specified opcode and operands. If successful, the constant result is 8415520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// returned, if not, null is returned. Note that this function can fail when 8425520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// attempting to fold instructions like loads and stores, which have no 8435520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// constant expression form. 8445520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// 84501b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman/// TODO: This function neither utilizes nor preserves nsw/nuw/inbounds/etc 84601b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman/// information, due to only being passed an opcode and operands. Constant 84701b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman/// folding using this function strips this information. 84801b97dd01eec1197d79fceb7229f5ec233994de3Dan Gohman/// 849db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris LattnerConstant *llvm::ConstantFoldInstOperands(unsigned Opcode, Type *DestTy, 8501d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foad ArrayRef<Constant *> Ops, 851618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier const TargetData *TD, 852618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier const TargetLibraryInfo *TLI) { 85303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Handle easy binops first. 854f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner if (Instruction::isBinaryOp(Opcode)) { 85503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (isa<ConstantExpr>(Ops[0]) || isa<ConstantExpr>(Ops[1])) 8567b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner if (Constant *C = SymbolicallyEvaluateBinop(Opcode, Ops[0], Ops[1], TD)) 85703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return C; 85803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 859baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::get(Opcode, Ops[0], Ops[1]); 86003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 8615520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 862f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner switch (Opcode) { 8635520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner default: return 0; 86479fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner case Instruction::ICmp: 86579fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner case Instruction::FCmp: assert(0 && "Invalid for compares"); 8665520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::Call: 8671d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foad if (Function *F = dyn_cast<Function>(Ops.back())) 8685520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (canConstantFoldCallTo(F)) 869618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier return ConstantFoldCall(F, Ops.slice(0, Ops.size() - 1), TLI); 8705520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return 0; 871001f7534e0311508cc93831a595785bb177f8a18Chris Lattner case Instruction::PtrToInt: 872001f7534e0311508cc93831a595785bb177f8a18Chris Lattner // If the input is a inttoptr, eliminate the pair. This requires knowing 873001f7534e0311508cc93831a595785bb177f8a18Chris Lattner // the width of a pointer, so it can't be done in ConstantExpr::getCast. 874001f7534e0311508cc93831a595785bb177f8a18Chris Lattner if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ops[0])) { 875001f7534e0311508cc93831a595785bb177f8a18Chris Lattner if (TD && CE->getOpcode() == Instruction::IntToPtr) { 876001f7534e0311508cc93831a595785bb177f8a18Chris Lattner Constant *Input = CE->getOperand(0); 8776de29f8d960505421d61c80cdb738e16720b6c0eDan Gohman unsigned InWidth = Input->getType()->getScalarSizeInBits(); 87804aa2c3520c049333ca216fb794d700310c4a33dNick Lewycky if (TD->getPointerSizeInBits() < InWidth) { 87904aa2c3520c049333ca216fb794d700310c4a33dNick Lewycky Constant *Mask = 8807b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner ConstantInt::get(CE->getContext(), APInt::getLowBitsSet(InWidth, 88104aa2c3520c049333ca216fb794d700310c4a33dNick Lewycky TD->getPointerSizeInBits())); 882baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson Input = ConstantExpr::getAnd(Input, Mask); 88304aa2c3520c049333ca216fb794d700310c4a33dNick Lewycky } 884001f7534e0311508cc93831a595785bb177f8a18Chris Lattner // Do a zext or trunc to get to the dest size. 885baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getIntegerCast(Input, DestTy, false); 886001f7534e0311508cc93831a595785bb177f8a18Chris Lattner } 887001f7534e0311508cc93831a595785bb177f8a18Chris Lattner } 888baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getCast(Opcode, Ops[0], DestTy); 889001f7534e0311508cc93831a595785bb177f8a18Chris Lattner case Instruction::IntToPtr: 89081b06be055e74a3c23a1c8f17ead97f9f76335eeDuncan Sands // If the input is a ptrtoint, turn the pair into a ptr to ptr bitcast if 89181b06be055e74a3c23a1c8f17ead97f9f76335eeDuncan Sands // the int size is >= the ptr size. This requires knowing the width of a 89281b06be055e74a3c23a1c8f17ead97f9f76335eeDuncan Sands // pointer, so it can't be done in ConstantExpr::getCast. 893b80a2a686fe76496d71397f8bdda394d5718ab01Dan Gohman if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ops[0])) 8949a38e3e3991ea443e555d8060f91202a786acdd4Dan Gohman if (TD && 895b80a2a686fe76496d71397f8bdda394d5718ab01Dan Gohman TD->getPointerSizeInBits() <= CE->getType()->getScalarSizeInBits() && 896b80a2a686fe76496d71397f8bdda394d5718ab01Dan Gohman CE->getOpcode() == Instruction::PtrToInt) 897b80a2a686fe76496d71397f8bdda394d5718ab01Dan Gohman return FoldBitCast(CE->getOperand(0), DestTy, *TD); 898b80a2a686fe76496d71397f8bdda394d5718ab01Dan Gohman 899baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getCast(Opcode, Ops[0], DestTy); 9005520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::Trunc: 9015520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::ZExt: 9025520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::SExt: 9035520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::FPTrunc: 9045520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::FPExt: 9055520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::UIToFP: 9065520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::SIToFP: 9075520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::FPToUI: 9085520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::FPToSI: 909baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getCast(Opcode, Ops[0], DestTy); 9105520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::BitCast: 9111afab9c1e0ae2d145ce01718aa14065393117e70Chris Lattner if (TD) 9126333c3959b7e3e43930ab523f0657791e9eb5d48Chris Lattner return FoldBitCast(Ops[0], DestTy, *TD); 913baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getBitCast(Ops[0], DestTy); 9145520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::Select: 915baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]); 9165520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::ExtractElement: 917baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getExtractElement(Ops[0], Ops[1]); 9185520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::InsertElement: 919baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]); 9205520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::ShuffleVector: 921baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]); 9225520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::GetElementPtr: 923618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier if (Constant *C = CastGEPIndices(Ops, DestTy, TD, TLI)) 9244f8eea82d8967cffa85b9df6c9255717b059009eDan Gohman return C; 925618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier if (Constant *C = SymbolicallyEvaluateGEP(Ops, DestTy, TD, TLI)) 92603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return C; 92703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 928dab3d29605a5c83db41b28176273ef55961120c1Jay Foad return ConstantExpr::getGetElementPtr(Ops[0], Ops.slice(1)); 9295520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner } 9305520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner} 9315520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 932f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner/// ConstantFoldCompareInstOperands - Attempt to constant fold a compare 933f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner/// instruction (icmp/fcmp) with the specified operands. If it fails, it 934f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner/// returns a constant expression of the specified operands. 935f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner/// 936f286f6fd93d569befe6e77c94a947e6e04e95685Chris LattnerConstant *llvm::ConstantFoldCompareInstOperands(unsigned Predicate, 9378f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner Constant *Ops0, Constant *Ops1, 938618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier const TargetData *TD, 939618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier const TargetLibraryInfo *TLI) { 940f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // fold: icmp (inttoptr x), null -> icmp x, 0 941f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // fold: icmp (ptrtoint x), 0 -> icmp x, null 9423dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky // fold: icmp (inttoptr x), (inttoptr y) -> icmp trunc/zext x, trunc/zext y 943f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // fold: icmp (ptrtoint x), (ptrtoint y) -> icmp x, y 944f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // 945f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // ConstantExpr::getCompare cannot do this, because it doesn't have TD 946f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // around to know if bit truncation is happening. 9478f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner if (ConstantExpr *CE0 = dyn_cast<ConstantExpr>(Ops0)) { 9488f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner if (TD && Ops1->isNullValue()) { 949db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *IntPtrTy = TD->getIntPtrType(CE0->getContext()); 950f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner if (CE0->getOpcode() == Instruction::IntToPtr) { 951f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // Convert the integer value to the right size to ensure we get the 952f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // proper extension or truncation. 953baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson Constant *C = ConstantExpr::getIntegerCast(CE0->getOperand(0), 954f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner IntPtrTy, false); 9558f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner Constant *Null = Constant::getNullValue(C->getType()); 956618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier return ConstantFoldCompareInstOperands(Predicate, C, Null, TD, TLI); 957f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner } 958f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner 959f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // Only do this transformation if the int is intptrty in size, otherwise 960f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner // there is a truncation or extension that we aren't modeling. 961f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner if (CE0->getOpcode() == Instruction::PtrToInt && 962f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner CE0->getType() == IntPtrTy) { 963f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner Constant *C = CE0->getOperand(0); 9648f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner Constant *Null = Constant::getNullValue(C->getType()); 965618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier return ConstantFoldCompareInstOperands(Predicate, C, Null, TD, TLI); 966f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner } 967f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner } 968f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner 9698f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner if (ConstantExpr *CE1 = dyn_cast<ConstantExpr>(Ops1)) { 9703dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky if (TD && CE0->getOpcode() == CE1->getOpcode()) { 971db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *IntPtrTy = TD->getIntPtrType(CE0->getContext()); 9723dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky 9733dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky if (CE0->getOpcode() == Instruction::IntToPtr) { 9743dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky // Convert the integer value to the right size to ensure we get the 9753dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky // proper extension or truncation. 976baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson Constant *C0 = ConstantExpr::getIntegerCast(CE0->getOperand(0), 9773dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky IntPtrTy, false); 978baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson Constant *C1 = ConstantExpr::getIntegerCast(CE1->getOperand(0), 9793dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky IntPtrTy, false); 980618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier return ConstantFoldCompareInstOperands(Predicate, C0, C1, TD, TLI); 9813dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky } 9823dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky 9833dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky // Only do this transformation if the int is intptrty in size, otherwise 9843dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky // there is a truncation or extension that we aren't modeling. 9853dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky if ((CE0->getOpcode() == Instruction::PtrToInt && 9863dfd7bf5110c47e99fd0fcce96122b90f699ca3aNick Lewycky CE0->getType() == IntPtrTy && 9878f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner CE0->getOperand(0)->getType() == CE1->getOperand(0)->getType())) 9888f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner return ConstantFoldCompareInstOperands(Predicate, CE0->getOperand(0), 989618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier CE1->getOperand(0), TD, TLI); 990f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner } 991f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner } 99279fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner 99379fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner // icmp eq (or x, y), 0 -> (icmp eq x, 0) & (icmp eq y, 0) 99479fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner // icmp ne (or x, y), 0 -> (icmp ne x, 0) | (icmp ne y, 0) 99579fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner if ((Predicate == ICmpInst::ICMP_EQ || Predicate == ICmpInst::ICMP_NE) && 99679fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner CE0->getOpcode() == Instruction::Or && Ops1->isNullValue()) { 99779fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner Constant *LHS = 998618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier ConstantFoldCompareInstOperands(Predicate, CE0->getOperand(0), Ops1, 999618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier TD, TLI); 100079fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner Constant *RHS = 1001618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier ConstantFoldCompareInstOperands(Predicate, CE0->getOperand(1), Ops1, 1002618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier TD, TLI); 100379fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner unsigned OpC = 100479fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner Predicate == ICmpInst::ICMP_EQ ? Instruction::And : Instruction::Or; 100579fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner Constant *Ops[] = { LHS, RHS }; 1006618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier return ConstantFoldInstOperands(OpC, LHS->getType(), Ops, TD, TLI); 100779fa3cf451a74dd1cec0be2d77d7ea9737dffc69Chris Lattner } 1008f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner } 10098f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner 10108f73deaa8732a556046bf4ac6207be55972e3b74Chris Lattner return ConstantExpr::getCompare(Predicate, Ops0, Ops1); 1011f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner} 1012f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner 1013f286f6fd93d569befe6e77c94a947e6e04e95685Chris Lattner 10145520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// ConstantFoldLoadThroughGEPConstantExpr - Given a constant and a 10155520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// getelementptr constantexpr, return the constant value being addressed by the 10165520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// constant expression, or null if something is funny and we can't decide. 10175520732b24a5a321140dd79af70d321c7ff3dec9Chris LattnerConstant *llvm::ConstantFoldLoadThroughGEPConstantExpr(Constant *C, 1018c6f69e94fa46f585b59bb9d7ace3224b0e638c95Dan Gohman ConstantExpr *CE) { 1019a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner if (!CE->getOperand(1)->isNullValue()) 10205520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return 0; // Do not allow stepping over the value! 1021a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner 1022a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner // Loop over all of the operands, tracking down which value we are 1023a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner // addressing. 1024a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner for (unsigned i = 2, e = CE->getNumOperands(); i != e; ++i) { 1025a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner C = C->getAggregateElement(CE->getOperand(i)); 1026a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner if (C == 0) return 0; 1027a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner } 1028a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner return C; 1029a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner} 1030a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner 1031a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner/// ConstantFoldLoadThroughGEPIndices - Given a constant and getelementptr 1032a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner/// indices (with an *implied* zero pointer index that is not in the list), 1033a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner/// return the constant value being addressed by a virtual load, or null if 1034a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner/// something is funny and we can't decide. 1035a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris LattnerConstant *llvm::ConstantFoldLoadThroughGEPIndices(Constant *C, 1036a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner ArrayRef<Constant*> Indices) { 10375520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner // Loop over all of the operands, tracking down which value we are 1038a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner // addressing. 1039a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner for (unsigned i = 0, e = Indices.size(); i != e; ++i) { 1040a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner C = C->getAggregateElement(Indices[i]); 1041a1f00f4d488eb5daff52faaf99c62ee652fd3b85Chris Lattner if (C == 0) return 0; 1042a97ddd0cffb9a9eb1313343fd49097c9057a5850Chris Lattner } 10435520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return C; 10445520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner} 10455520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 10465520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 1047bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell//===----------------------------------------------------------------------===// 10485520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner// Constant Folding for Calls 1049bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// 1050bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 1051bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell/// canConstantFoldCallTo - Return true if its even possible to fold a call to 1052bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell/// the specified function. 1053bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswellbool 1054fa9b80eb64127b3d9691e18537975635520e51e9Dan Gohmanllvm::canConstantFoldCallTo(const Function *F) { 1055bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell switch (F->getIntrinsicID()) { 10569ab7fb3ba47442d521a5bed09a27a5e8e7a786edDale Johannesen case Intrinsic::sqrt: 105724fbf2bf161b20b13d0a218345bdcd092bdd56f8Chad Rosier case Intrinsic::pow: 10589ab7fb3ba47442d521a5bed09a27a5e8e7a786edDale Johannesen case Intrinsic::powi: 1059e9391fd9b52e93717b365bdd05c471101323a4dfReid Spencer case Intrinsic::bswap: 1060e9391fd9b52e93717b365bdd05c471101323a4dfReid Spencer case Intrinsic::ctpop: 1061e9391fd9b52e93717b365bdd05c471101323a4dfReid Spencer case Intrinsic::ctlz: 1062e9391fd9b52e93717b365bdd05c471101323a4dfReid Spencer case Intrinsic::cttz: 10631614e50d9f6d48a38e4dafb4b1a51fd4b37614f3Evan Phoenix case Intrinsic::sadd_with_overflow: 10646208610fd602ebdb18bb793152899573d0b2b7abFrits van Bommel case Intrinsic::uadd_with_overflow: 10651614e50d9f6d48a38e4dafb4b1a51fd4b37614f3Evan Phoenix case Intrinsic::ssub_with_overflow: 10666208610fd602ebdb18bb793152899573d0b2b7abFrits van Bommel case Intrinsic::usub_with_overflow: 1067eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::smul_with_overflow: 10686208610fd602ebdb18bb793152899573d0b2b7abFrits van Bommel case Intrinsic::umul_with_overflow: 1069faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov case Intrinsic::convert_from_fp16: 1070faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov case Intrinsic::convert_to_fp16: 107115ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse_cvtss2si: 107215ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse_cvtss2si64: 107315ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse_cvttss2si: 107415ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse_cvttss2si64: 107515ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse2_cvtsd2si: 107615ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse2_cvtsd2si64: 107715ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse2_cvttsd2si: 107815ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse2_cvttsd2si64: 1079bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell return true; 108068a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner default: 108168a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner return false; 108268a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner case 0: break; 1083bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 1084bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 10856f532a988e5c02fcb271fb65e9e7b83f0147d3f2Chris Lattner if (!F->hasName()) return false; 1086f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar StringRef Name = F->getName(); 1087c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner 1088c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner // In these cases, the check of the length is required. We don't want to 1089c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner // return true for a name like "cos\0blah" which strcmp would return equal to 1090c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner // "cos", but has length 8. 1091f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar switch (Name[0]) { 1092c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner default: return false; 1093c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'a': 1094f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar return Name == "acos" || Name == "asin" || 1095f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar Name == "atan" || Name == "atan2"; 1096c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'c': 1097f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar return Name == "cos" || Name == "ceil" || Name == "cosf" || Name == "cosh"; 1098c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'e': 1099805fa97a0f5ff61624855da37d4881708fb8f0fbChris Lattner return Name == "exp" || Name == "exp2"; 1100c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'f': 1101f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar return Name == "fabs" || Name == "fmod" || Name == "floor"; 1102c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'l': 1103f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar return Name == "log" || Name == "log10"; 1104c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'p': 1105f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar return Name == "pow"; 1106c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 's': 1107f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar return Name == "sin" || Name == "sinh" || Name == "sqrt" || 1108f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar Name == "sinf" || Name == "sqrtf"; 1109c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 't': 1110f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar return Name == "tan" || Name == "tanh"; 1111bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 1112bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell} 1113bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 111472d88ae5447a3929c97e88f4c806213847b5d988Chris Lattnerstatic Constant *ConstantFoldFP(double (*NativeFP)(double), double V, 1115db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *Ty) { 11163f2f21e640682c604d9322ba0708e122d1fcf5eeDan Gohman sys::llvm_fenv_clearexcept(); 1117bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell V = NativeFP(V); 11183f2f21e640682c604d9322ba0708e122d1fcf5eeDan Gohman if (sys::llvm_fenv_testexcept()) { 11193f2f21e640682c604d9322ba0708e122d1fcf5eeDan Gohman sys::llvm_fenv_clearexcept(); 1120f19f58a9360927f8ef50b9a029e8efb780d3d8a8Chris Lattner return 0; 112143421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen } 1122f19f58a9360927f8ef50b9a029e8efb780d3d8a8Chris Lattner 1123d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner if (Ty->isFloatTy()) 11247b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFP::get(Ty->getContext(), APFloat((float)V)); 1125d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner if (Ty->isDoubleTy()) 11267b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFP::get(Ty->getContext(), APFloat(V)); 1127c23197a26f34f559ea9797de51e187087c039c42Torok Edwin llvm_unreachable("Can only constant fold float/double"); 1128bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell} 1129bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 1130384152444d22d356f7b4090a158da4cbc1f79464Dan Gohmanstatic Constant *ConstantFoldBinaryFP(double (*NativeFP)(double, double), 1131db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner double V, double W, Type *Ty) { 11323f2f21e640682c604d9322ba0708e122d1fcf5eeDan Gohman sys::llvm_fenv_clearexcept(); 1133384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman V = NativeFP(V, W); 11343f2f21e640682c604d9322ba0708e122d1fcf5eeDan Gohman if (sys::llvm_fenv_testexcept()) { 11353f2f21e640682c604d9322ba0708e122d1fcf5eeDan Gohman sys::llvm_fenv_clearexcept(); 1136f19f58a9360927f8ef50b9a029e8efb780d3d8a8Chris Lattner return 0; 113743421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen } 1138f19f58a9360927f8ef50b9a029e8efb780d3d8a8Chris Lattner 1139d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner if (Ty->isFloatTy()) 11407b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFP::get(Ty->getContext(), APFloat((float)V)); 1141d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner if (Ty->isDoubleTy()) 11427b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFP::get(Ty->getContext(), APFloat(V)); 1143c23197a26f34f559ea9797de51e187087c039c42Torok Edwin llvm_unreachable("Can only constant fold float/double"); 1144384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman} 1145384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman 114615ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth/// ConstantFoldConvertToInt - Attempt to an SSE floating point to integer 114715ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth/// conversion of a constant floating point. If roundTowardZero is false, the 114815ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth/// default IEEE rounding is used (toward nearest, ties to even). This matches 114915ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth/// the behavior of the non-truncating SSE instructions in the default rounding 115015ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth/// mode. The desired integer type Ty is used to select how many bits are 115115ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth/// available for the result. Returns null if the conversion cannot be 115215ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth/// performed, otherwise returns the Constant value resulting from the 115315ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth/// conversion. 11546b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattnerstatic Constant *ConstantFoldConvertToInt(const APFloat &Val, 11556b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner bool roundTowardZero, Type *Ty) { 115615ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth // All of these conversion intrinsics form an integer of at most 64bits. 115715ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth unsigned ResultWidth = cast<IntegerType>(Ty)->getBitWidth(); 115815ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth assert(ResultWidth <= 64 && 115915ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth "Can only constant fold conversions to 64 and 32 bit ints"); 116015ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth 116115ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth uint64_t UIntVal; 116215ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth bool isExact = false; 116315ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth APFloat::roundingMode mode = roundTowardZero? APFloat::rmTowardZero 116415ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth : APFloat::rmNearestTiesToEven; 116515ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth APFloat::opStatus status = Val.convertToInteger(&UIntVal, ResultWidth, 116615ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth /*isSigned=*/true, mode, 116715ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth &isExact); 116815ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth if (status != APFloat::opOK && status != APFloat::opInexact) 116915ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth return 0; 117015ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth return ConstantInt::get(Ty, UIntVal, /*isSigned=*/true); 117115ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth} 117215ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth 1173bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell/// ConstantFoldCall - Attempt to constant fold a call to the specified function 1174bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell/// with the specified arguments, returning null if unsuccessful. 1175bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John CriswellConstant * 1176618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosierllvm::ConstantFoldCall(Function *F, ArrayRef<Constant *> Operands, 1177618c1dbd293d15ee19f61b1156ab8086ad28311aChad Rosier const TargetLibraryInfo *TLI) { 11786f532a988e5c02fcb271fb65e9e7b83f0147d3f2Chris Lattner if (!F->hasName()) return 0; 1179f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar StringRef Name = F->getName(); 1180e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner 1181db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *Ty = F->getReturnType(); 11821d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foad if (Operands.size() == 1) { 1183bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell if (ConstantFP *Op = dyn_cast<ConstantFP>(Operands[0])) { 1184f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth if (F->getIntrinsicID() == Intrinsic::convert_to_fp16) { 1185faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov APFloat Val(Op->getValueAPF()); 1186faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov 1187faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov bool lost = false; 1188faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov Val.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven, &lost); 1189faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov 1190faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov return ConstantInt::get(F->getContext(), Val.bitcastToAPInt()); 1191faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov } 119221646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (!TLI) 119321646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier return 0; 1194faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov 1195d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner if (!Ty->isFloatTy() && !Ty->isDoubleTy()) 119643421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen return 0; 11971f386c4ce1983c448320aecca8d3cd27d1497867Jakob Stoklund Olesen 11981f386c4ce1983c448320aecca8d3cd27d1497867Jakob Stoklund Olesen /// We only fold functions with finite arguments. Folding NaN and inf is 11991f386c4ce1983c448320aecca8d3cd27d1497867Jakob Stoklund Olesen /// likely to be aborted with an exception anyway, and some host libms 12001f386c4ce1983c448320aecca8d3cd27d1497867Jakob Stoklund Olesen /// have known errors raising exceptions. 12011f386c4ce1983c448320aecca8d3cd27d1497867Jakob Stoklund Olesen if (Op->getValueAPF().isNaN() || Op->getValueAPF().isInfinity()) 12021f386c4ce1983c448320aecca8d3cd27d1497867Jakob Stoklund Olesen return 0; 12031f386c4ce1983c448320aecca8d3cd27d1497867Jakob Stoklund Olesen 120443421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen /// Currently APFloat versions of these functions do not exist, so we use 120543421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen /// the host native double versions. Float versions are not called 120643421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen /// directly but for all these it is true (float)(f((double)arg)) == 120743421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen /// f(arg). Long double not supported yet. 1208d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner double V = Ty->isFloatTy() ? (double)Op->getValueAPF().convertToFloat() : 120943421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen Op->getValueAPF().convertToDouble(); 1210f0443c1eb44d737d9bd78962932fc80f74c6113cDaniel Dunbar switch (Name[0]) { 1211c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'a': 121221646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "acos" && TLI->has(LibFunc::acos)) 12137b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(acos, V, Ty); 121421646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "asin" && TLI->has(LibFunc::asin)) 12157b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(asin, V, Ty); 121621646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "atan" && TLI->has(LibFunc::atan)) 12177b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(atan, V, Ty); 1218c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 1219c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'c': 122021646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "ceil" && TLI->has(LibFunc::ceil)) 12217b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(ceil, V, Ty); 122221646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "cos" && TLI->has(LibFunc::cos)) 12237b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(cos, V, Ty); 122421646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "cosh" && TLI->has(LibFunc::cosh)) 12257b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(cosh, V, Ty); 122621646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "cosf" && TLI->has(LibFunc::cosf)) 12277b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(cos, V, Ty); 1228c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 1229c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'e': 123021646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "exp" && TLI->has(LibFunc::exp)) 12317b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(exp, V, Ty); 1232805fa97a0f5ff61624855da37d4881708fb8f0fbChris Lattner 123321646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "exp2" && TLI->has(LibFunc::exp2)) { 1234805fa97a0f5ff61624855da37d4881708fb8f0fbChris Lattner // Constant fold exp2(x) as pow(2,x) in case the host doesn't have a 1235805fa97a0f5ff61624855da37d4881708fb8f0fbChris Lattner // C99 library. 1236805fa97a0f5ff61624855da37d4881708fb8f0fbChris Lattner return ConstantFoldBinaryFP(pow, 2.0, V, Ty); 1237805fa97a0f5ff61624855da37d4881708fb8f0fbChris Lattner } 1238c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 1239c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'f': 124021646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "fabs" && TLI->has(LibFunc::fabs)) 12417b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(fabs, V, Ty); 124221646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "floor" && TLI->has(LibFunc::floor)) 12437b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(floor, V, Ty); 1244c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 1245c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'l': 124621646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "log" && V > 0 && TLI->has(LibFunc::log)) 12477b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(log, V, Ty); 124821646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "log10" && V > 0 && TLI->has(LibFunc::log10)) 12497b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(log10, V, Ty); 1250f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth else if (F->getIntrinsicID() == Intrinsic::sqrt && 1251f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth (Ty->isFloatTy() || Ty->isDoubleTy())) { 1252c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (V >= -0.0) 12537b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(sqrt, V, Ty); 1254c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else // Undefined 1255a7235ea7245028a0723e8ab7fd011386b3900777Owen Anderson return Constant::getNullValue(Ty); 1256c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner } 1257c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 1258c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 's': 125921646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "sin" && TLI->has(LibFunc::sin)) 12607b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(sin, V, Ty); 126121646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "sinh" && TLI->has(LibFunc::sinh)) 12627b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(sinh, V, Ty); 126321646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "sqrt" && V >= 0 && TLI->has(LibFunc::sqrt)) 12647b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(sqrt, V, Ty); 126521646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "sqrtf" && V >= 0 && TLI->has(LibFunc::sqrtf)) 12667b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(sqrt, V, Ty); 126721646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "sinf" && TLI->has(LibFunc::sinf)) 12687b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(sin, V, Ty); 1269c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 1270c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 't': 127121646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "tan" && TLI->has(LibFunc::tan)) 12727b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(tan, V, Ty); 127321646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier else if (Name == "tanh" && TLI->has(LibFunc::tanh)) 12747b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldFP(tanh, V, Ty); 1275c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 1276c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner default: 1277c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 1278bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 127968a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner return 0; 128068a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner } 1281f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth 128268a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner if (ConstantInt *Op = dyn_cast<ConstantInt>(Operands[0])) { 1283f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth switch (F->getIntrinsicID()) { 1284f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth case Intrinsic::bswap: 12857b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantInt::get(F->getContext(), Op->getValue().byteSwap()); 1286f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth case Intrinsic::ctpop: 1287eed707b1e6097aac2bb6b3d47271f6300ace7f2eOwen Anderson return ConstantInt::get(Ty, Op->getValue().countPopulation()); 1288f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth case Intrinsic::convert_from_fp16: { 1289faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov APFloat Val(Op->getValue()); 1290faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov 1291faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov bool lost = false; 1292faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov APFloat::opStatus status = 1293faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov Val.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &lost); 1294faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov 1295faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov // Conversion is always precise. 12968e68c3873549ca31533e2e3e40dda3a43cb79566Jeffrey Yasskin (void)status; 1297faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov assert(status == APFloat::opOK && !lost && 1298faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov "Precision lost during fp16 constfolding"); 1299faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov 1300faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov return ConstantFP::get(F->getContext(), Val); 1301faa75f6e47350f491a44d5e8773acd9457185d51Anton Korobeynikov } 1302f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth default: 1303f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth return 0; 1304f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth } 1305bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 1306f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth 13076b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner // Support ConstantVector in case we have an Undef in the top. 13086b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner if (isa<ConstantVector>(Operands[0]) || 13096b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner isa<ConstantDataVector>(Operands[0])) { 13106b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner Constant *Op = cast<Constant>(Operands[0]); 131115ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth switch (F->getIntrinsicID()) { 131215ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth default: break; 131315ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse_cvtss2si: 131415ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse_cvtss2si64: 131515ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse2_cvtsd2si: 131615ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse2_cvtsd2si64: 13176b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner if (ConstantFP *FPOp = 13186b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner dyn_cast_or_null<ConstantFP>(Op->getAggregateElement(0U))) 13196b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner return ConstantFoldConvertToInt(FPOp->getValueAPF(), 13206b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner /*roundTowardZero=*/false, Ty); 132115ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse_cvttss2si: 132215ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse_cvttss2si64: 132315ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse2_cvttsd2si: 132415ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth case Intrinsic::x86_sse2_cvttsd2si64: 13256b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner if (ConstantFP *FPOp = 13266b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner dyn_cast_or_null<ConstantFP>(Op->getAggregateElement(0U))) 13276b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner return ConstantFoldConvertToInt(FPOp->getValueAPF(), 13286b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner /*roundTowardZero=*/true, Ty); 132915ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth } 133015ed90c859e5df11112c614c83d0d2e786d4c73aChandler Carruth } 13316b0dc92043ab1f63d78b8796098575e1d777b701Chris Lattner 13329ee7123ab462d97a2b242280e9bf0b47883531cbDan Gohman if (isa<UndefValue>(Operands[0])) { 1333f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth if (F->getIntrinsicID() == Intrinsic::bswap) 13349ee7123ab462d97a2b242280e9bf0b47883531cbDan Gohman return Operands[0]; 13359ee7123ab462d97a2b242280e9bf0b47883531cbDan Gohman return 0; 13369ee7123ab462d97a2b242280e9bf0b47883531cbDan Gohman } 13379ee7123ab462d97a2b242280e9bf0b47883531cbDan Gohman 133868a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner return 0; 133968a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner } 1340f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth 13411d2f569c3428d70d0cf690c9adb459ad4a3ecff2Jay Foad if (Operands.size() == 2) { 1342bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell if (ConstantFP *Op1 = dyn_cast<ConstantFP>(Operands[0])) { 1343d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner if (!Ty->isFloatTy() && !Ty->isDoubleTy()) 13449ab7fb3ba47442d521a5bed09a27a5e8e7a786edDale Johannesen return 0; 1345d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner double Op1V = Ty->isFloatTy() ? 1346d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner (double)Op1->getValueAPF().convertToFloat() : 134743421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen Op1->getValueAPF().convertToDouble(); 1348bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell if (ConstantFP *Op2 = dyn_cast<ConstantFP>(Operands[1])) { 1349d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner if (Op2->getType() != Op1->getType()) 1350d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner return 0; 135121646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier 1352d0806a1519f3bc450d2dea3e6f22db73fc797e4cChris Lattner double Op2V = Ty->isFloatTy() ? 135343421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen (double)Op2->getValueAPF().convertToFloat(): 135443421b3dd70af5b70e71816521f37502c397cc65Dale Johannesen Op2->getValueAPF().convertToDouble(); 1355bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 135624fbf2bf161b20b13d0a218345bdcd092bdd56f8Chad Rosier if (F->getIntrinsicID() == Intrinsic::pow) { 135724fbf2bf161b20b13d0a218345bdcd092bdd56f8Chad Rosier return ConstantFoldBinaryFP(pow, Op1V, Op2V, Ty); 135824fbf2bf161b20b13d0a218345bdcd092bdd56f8Chad Rosier } 135924fbf2bf161b20b13d0a218345bdcd092bdd56f8Chad Rosier if (!TLI) 136024fbf2bf161b20b13d0a218345bdcd092bdd56f8Chad Rosier return 0; 136121646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "pow" && TLI->has(LibFunc::pow)) 13627b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldBinaryFP(pow, Op1V, Op2V, Ty); 136321646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "fmod" && TLI->has(LibFunc::fmod)) 13647b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldBinaryFP(fmod, Op1V, Op2V, Ty); 136521646e8becaa13cb813490edcd7fe9150b11f88eChad Rosier if (Name == "atan2" && TLI->has(LibFunc::atan2)) 13667b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFoldBinaryFP(atan2, Op1V, Op2V, Ty); 1367b5282dcf4745be59046f440980a1c0f0a50c9c09Chris Lattner } else if (ConstantInt *Op2C = dyn_cast<ConstantInt>(Operands[1])) { 1368f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth if (F->getIntrinsicID() == Intrinsic::powi && Ty->isFloatTy()) 13697b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFP::get(F->getContext(), 13707b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner APFloat((float)std::pow((float)Op1V, 137102a260aa11a2e1b2c14335274d3c42ca3f3eabc0Chris Lattner (int)Op2C->getZExtValue()))); 1372f4db877cff62340aaf9f29d3994562ae1cee8d72Chandler Carruth if (F->getIntrinsicID() == Intrinsic::powi && Ty->isDoubleTy()) 13737b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner return ConstantFP::get(F->getContext(), 13747b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner APFloat((double)std::pow((double)Op1V, 13757b550ccfc5a3346c17e0390a59e2d6d19bc52705Chris Lattner (int)Op2C->getZExtValue()))); 1376bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 137768a0603dc5d3d79cd4de2195e950af26c3380cd7Chris Lattner return 0; 1378bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 1379e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner 1380e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner if (ConstantInt *Op1 = dyn_cast<ConstantInt>(Operands[0])) { 1381e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner if (ConstantInt *Op2 = dyn_cast<ConstantInt>(Operands[1])) { 1382e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner switch (F->getIntrinsicID()) { 1383e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner default: break; 1384eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::sadd_with_overflow: 1385eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::uadd_with_overflow: 1386eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::ssub_with_overflow: 1387eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::usub_with_overflow: 13886208610fd602ebdb18bb793152899573d0b2b7abFrits van Bommel case Intrinsic::smul_with_overflow: 13896208610fd602ebdb18bb793152899573d0b2b7abFrits van Bommel case Intrinsic::umul_with_overflow: { 1390eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner APInt Res; 1391eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner bool Overflow; 1392eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner switch (F->getIntrinsicID()) { 1393eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner default: assert(0 && "Invalid case"); 1394eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::sadd_with_overflow: 1395eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner Res = Op1->getValue().sadd_ov(Op2->getValue(), Overflow); 1396eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner break; 1397eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::uadd_with_overflow: 1398eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner Res = Op1->getValue().uadd_ov(Op2->getValue(), Overflow); 1399eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner break; 1400eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::ssub_with_overflow: 1401eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner Res = Op1->getValue().ssub_ov(Op2->getValue(), Overflow); 1402eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner break; 1403eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::usub_with_overflow: 1404eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner Res = Op1->getValue().usub_ov(Op2->getValue(), Overflow); 1405eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner break; 1406eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner case Intrinsic::smul_with_overflow: 1407eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner Res = Op1->getValue().smul_ov(Op2->getValue(), Overflow); 1408eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner break; 14096208610fd602ebdb18bb793152899573d0b2b7abFrits van Bommel case Intrinsic::umul_with_overflow: 14106208610fd602ebdb18bb793152899573d0b2b7abFrits van Bommel Res = Op1->getValue().umul_ov(Op2->getValue(), Overflow); 14116208610fd602ebdb18bb793152899573d0b2b7abFrits van Bommel break; 1412eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner } 1413e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner Constant *Ops[] = { 1414eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner ConstantInt::get(F->getContext(), Res), 1415eafc5cb80d58cb9447623a557be4d4f55f42fbc3Chris Lattner ConstantInt::get(Type::getInt1Ty(F->getContext()), Overflow) 1416e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner }; 1417b065b06c12dba6001b8140df2744d0c856ef6ea1Chris Lattner return ConstantStruct::get(cast<StructType>(F->getReturnType()), Ops); 1418e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner } 1419ccbf1e36d34c2d66600748bdd8767dc122629a58Chandler Carruth case Intrinsic::cttz: 1420ccbf1e36d34c2d66600748bdd8767dc122629a58Chandler Carruth // FIXME: This should check for Op2 == 1, and become unreachable if 1421ccbf1e36d34c2d66600748bdd8767dc122629a58Chandler Carruth // Op1 == 0. 1422ccbf1e36d34c2d66600748bdd8767dc122629a58Chandler Carruth return ConstantInt::get(Ty, Op1->getValue().countTrailingZeros()); 1423ccbf1e36d34c2d66600748bdd8767dc122629a58Chandler Carruth case Intrinsic::ctlz: 1424ccbf1e36d34c2d66600748bdd8767dc122629a58Chandler Carruth // FIXME: This should check for Op2 == 1, and become unreachable if 1425ccbf1e36d34c2d66600748bdd8767dc122629a58Chandler Carruth // Op1 == 0. 1426ccbf1e36d34c2d66600748bdd8767dc122629a58Chandler Carruth return ConstantInt::get(Ty, Op1->getValue().countLeadingZeros()); 1427e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner } 1428e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner } 1429e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner 1430e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner return 0; 1431e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner } 1432e65cd40ab99c3bd43dc997873e500643d012bbadChris Lattner return 0; 1433bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 1434bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell return 0; 1435bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell} 1436