ConstantFolding.cpp revision c5f6a1f9d61d74017d90e149728cb3d283e0a0e0
1bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell//===-- ConstantFolding.cpp - Analyze constant folding possibilities ------===// 2bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// 3bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// The LLVM Compiler Infrastructure 4bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// 5bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// This file was developed by the LLVM research group and is distributed under 6bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// the University of Illinois Open Source License. See LICENSE.TXT for details. 7bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// 8bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell//===----------------------------------------------------------------------===// 9bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// 10bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// This family of functions determines the possibility of performing constant 11bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// folding. 12bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// 13bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell//===----------------------------------------------------------------------===// 14bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 15bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include "llvm/Analysis/ConstantFolding.h" 16bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include "llvm/Constants.h" 17bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include "llvm/DerivedTypes.h" 185520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner#include "llvm/Function.h" 19bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include "llvm/Instructions.h" 20bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include "llvm/Intrinsics.h" 215520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner#include "llvm/ADT/SmallVector.h" 22c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner#include "llvm/ADT/StringMap.h" 2303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner#include "llvm/Target/TargetData.h" 24bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include "llvm/Support/GetElementPtrTypeIterator.h" 25bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include "llvm/Support/MathExtras.h" 26bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell#include <cerrno> 2797af751deb9b26fd42fbcee082da9ccc4ded5b45Jeff Cohen#include <cmath> 28bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswellusing namespace llvm; 29bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 3003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner//===----------------------------------------------------------------------===// 3103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner// Constant Folding internal helper functions 3203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner//===----------------------------------------------------------------------===// 3303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 3403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// IsConstantOffsetFromGlobal - If this constant is actually a constant offset 3503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// from a global, return the global and the constant. Because of 3603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// constantexprs, this function is recursive. 3703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattnerstatic bool IsConstantOffsetFromGlobal(Constant *C, GlobalValue *&GV, 3803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner int64_t &Offset, const TargetData &TD) { 3903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Trivial case, constant is the global. 4003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if ((GV = dyn_cast<GlobalValue>(C))) { 4103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner Offset = 0; 4203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return true; 4303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 4403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 4503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Otherwise, if this isn't a constant expr, bail out. 4603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner ConstantExpr *CE = dyn_cast<ConstantExpr>(C); 4703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (!CE) return false; 4803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 4903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Look through ptr->int and ptr->ptr casts. 5003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (CE->getOpcode() == Instruction::PtrToInt || 5103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner CE->getOpcode() == Instruction::BitCast) 5203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return IsConstantOffsetFromGlobal(CE->getOperand(0), GV, Offset, TD); 5303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 5403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // i32* getelementptr ([5 x i32]* @a, i32 0, i32 5) 5503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (CE->getOpcode() == Instruction::GetElementPtr) { 5603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Cannot compute this if the element type of the pointer is missing size 5703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // info. 5803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (!cast<PointerType>(CE->getOperand(0)->getType())->getElementType()->isSized()) 5903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return false; 6003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 6103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // If the base isn't a global+constant, we aren't either. 6203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (!IsConstantOffsetFromGlobal(CE->getOperand(0), GV, Offset, TD)) 6303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return false; 6403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 6503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Otherwise, add any offset that our operands provide. 6603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner gep_type_iterator GTI = gep_type_begin(CE); 6703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i, ++GTI) { 6803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner ConstantInt *CI = dyn_cast<ConstantInt>(CE->getOperand(i)); 6903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (!CI) return false; // Index isn't a simple constant? 7003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (CI->getZExtValue() == 0) continue; // Not adding anything. 7103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 7203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (const StructType *ST = dyn_cast<StructType>(*GTI)) { 7303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // N = N + Offset 74b1919e2f08ecb37140af676fd2916f8d5ed7df3dChris Lattner Offset += TD.getStructLayout(ST)->getElementOffset(CI->getZExtValue()); 7503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } else { 76ca5183d445954a9b2a570d6bbba1bc2b00ad6442Jeff Cohen const SequentialType *SQT = cast<SequentialType>(*GTI); 77ca5183d445954a9b2a570d6bbba1bc2b00ad6442Jeff Cohen Offset += TD.getTypeSize(SQT->getElementType())*CI->getSExtValue(); 7803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 7903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 8003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return true; 8103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 8203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 8303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return false; 8403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner} 8503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 8603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 8703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// SymbolicallyEvaluateBinop - One of Op0/Op1 is a constant expression. 8803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// Attempt to symbolically evaluate the result of a binary operator merging 8903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// these together. If target data info is available, it is provided as TD, 9003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// otherwise TD is null. 9103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattnerstatic Constant *SymbolicallyEvaluateBinop(unsigned Opc, Constant *Op0, 9203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner Constant *Op1, const TargetData *TD){ 9303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // SROA 9403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 9503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Fold (and 0xffffffff00000000, (shl x, 32)) -> shl. 9603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Fold (lshr (or X, Y), 32) -> (lshr [X/Y], 32) if one doesn't contribute 9703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // bits. 9803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 9903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 10003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // If the constant expr is something like &A[123] - &A[4].f, fold this into a 10103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // constant. This happens frequently when iterating over a global array. 10203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (Opc == Instruction::Sub && TD) { 10303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner GlobalValue *GV1, *GV2; 10403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner int64_t Offs1, Offs2; 10503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 10603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (IsConstantOffsetFromGlobal(Op0, GV1, Offs1, *TD)) 10703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (IsConstantOffsetFromGlobal(Op1, GV2, Offs2, *TD) && 10803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner GV1 == GV2) { 10903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // (&GV+C1) - (&GV+C2) -> C1-C2, pointer arithmetic cannot overflow. 11003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return ConstantInt::get(Op0->getType(), Offs1-Offs2); 11103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 11203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 11303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 11403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // TODO: Fold icmp setne/seteq as well. 11503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return 0; 11603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner} 11703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 11803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// SymbolicallyEvaluateGEP - If we can symbolically evaluate the specified GEP 11903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner/// constant expression, do so. 12003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattnerstatic Constant *SymbolicallyEvaluateGEP(Constant** Ops, unsigned NumOps, 12103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner const Type *ResultTy, 12203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner const TargetData *TD) { 12303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner Constant *Ptr = Ops[0]; 12403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (!cast<PointerType>(Ptr->getType())->getElementType()->isSized()) 12503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return 0; 12603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 12703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (TD && Ptr->isNullValue()) { 12803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // If this is a constant expr gep that is effectively computing an 12903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // "offsetof", fold it into 'cast int Size to T*' instead of 'gep 0, 0, 12' 13003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner bool isFoldableGEP = true; 13103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner for (unsigned i = 1; i != NumOps; ++i) 13203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (!isa<ConstantInt>(Ops[i])) { 13303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner isFoldableGEP = false; 13403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner break; 13503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 13603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (isFoldableGEP) { 137309f87e34a12e3398932e4c2c9e3c47cad0e8f0fChris Lattner uint64_t Offset = TD->getIndexedOffset(Ptr->getType(), 138309f87e34a12e3398932e4c2c9e3c47cad0e8f0fChris Lattner (Value**)Ops+1, NumOps-1); 13903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner Constant *C = ConstantInt::get(TD->getIntPtrType(), Offset); 14003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return ConstantExpr::getIntToPtr(C, ResultTy); 14103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 14203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 14303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 14403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return 0; 14503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner} 14603dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 14703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 14803dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner//===----------------------------------------------------------------------===// 14903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner// Constant Folding public APIs 15003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner//===----------------------------------------------------------------------===// 15103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 15203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 1535520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// ConstantFoldInstruction - Attempt to constant fold the specified 1545520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// instruction. If successful, the constant result is returned, if not, null 1555520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// is returned. Note that this function can only fail when attempting to fold 1565520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// instructions like loads and stores, which have no constant expression form. 1575520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// 1585520732b24a5a321140dd79af70d321c7ff3dec9Chris LattnerConstant *llvm::ConstantFoldInstruction(Instruction *I, const TargetData *TD) { 1595520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (PHINode *PN = dyn_cast<PHINode>(I)) { 1605520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (PN->getNumIncomingValues() == 0) 1615520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return Constant::getNullValue(PN->getType()); 1625520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 1635520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner Constant *Result = dyn_cast<Constant>(PN->getIncomingValue(0)); 1645520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (Result == 0) return 0; 1655520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 1665520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner // Handle PHI nodes specially here... 1675520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner for (unsigned i = 1, e = PN->getNumIncomingValues(); i != e; ++i) 1685520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (PN->getIncomingValue(i) != Result && PN->getIncomingValue(i) != PN) 1695520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return 0; // Not all the same incoming constants... 1705520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 1715520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner // If we reach here, all incoming values are the same constant. 1725520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return Result; 1735520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner } 1745520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 1755520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner // Scan the operand list, checking to see if they are all constants, if so, 1765520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner // hand off to ConstantFoldInstOperands. 1775520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner SmallVector<Constant*, 8> Ops; 1785520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) 1795520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (Constant *Op = dyn_cast<Constant>(I->getOperand(i))) 1805520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner Ops.push_back(Op); 1815520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner else 1825520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return 0; // All operands not constant! 1835520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 18403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return ConstantFoldInstOperands(I, &Ops[0], Ops.size(), TD); 1855520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner} 1865520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 1875520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// ConstantFoldInstOperands - Attempt to constant fold an instruction with the 1885520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// specified opcode and operands. If successful, the constant result is 1895520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// returned, if not, null is returned. Note that this function can fail when 1905520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// attempting to fold instructions like loads and stores, which have no 1915520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// constant expression form. 1925520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// 1935520732b24a5a321140dd79af70d321c7ff3dec9Chris LattnerConstant *llvm::ConstantFoldInstOperands(const Instruction* I, 1945520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner Constant** Ops, unsigned NumOps, 1955520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner const TargetData *TD) { 1965520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner unsigned Opc = I->getOpcode(); 1975520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner const Type *DestTy = I->getType(); 1985520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 19903dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner // Handle easy binops first. 20003dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (isa<BinaryOperator>(I)) { 20103dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (isa<ConstantExpr>(Ops[0]) || isa<ConstantExpr>(Ops[1])) 20203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (Constant *C = SymbolicallyEvaluateBinop(I->getOpcode(), Ops[0], 20303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner Ops[1], TD)) 20403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return C; 20503dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 2065520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return ConstantExpr::get(Opc, Ops[0], Ops[1]); 20703dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner } 2085520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 2095520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner switch (Opc) { 2105520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner default: return 0; 2115520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::Call: 2125520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (Function *F = dyn_cast<Function>(Ops[0])) 2135520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (canConstantFoldCallTo(F)) 214ad58eb34342f70f094008e6d08cb4ed814754e64Chris Lattner return ConstantFoldCall(F, Ops+1, NumOps-1); 2155520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return 0; 2165520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::ICmp: 2175520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::FCmp: 2185520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return ConstantExpr::getCompare(cast<CmpInst>(I)->getPredicate(), Ops[0], 2195520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner Ops[1]); 2205520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::Trunc: 2215520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::ZExt: 2225520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::SExt: 2235520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::FPTrunc: 2245520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::FPExt: 2255520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::UIToFP: 2265520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::SIToFP: 2275520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::FPToUI: 2285520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::FPToSI: 2295520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::PtrToInt: 2305520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::IntToPtr: 2315520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::BitCast: 2325520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return ConstantExpr::getCast(Opc, Ops[0], DestTy); 2335520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::Select: 2345520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]); 2355520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::ExtractElement: 2365520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return ConstantExpr::getExtractElement(Ops[0], Ops[1]); 2375520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::InsertElement: 2385520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]); 2395520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::ShuffleVector: 2405520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]); 2415520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner case Instruction::GetElementPtr: 24203dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner if (Constant *C = SymbolicallyEvaluateGEP(Ops, NumOps, I->getType(), TD)) 24303dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner return C; 24403dd25ca964813c8b9fe14479443b9c21fb92c55Chris Lattner 245d917fe56926f2f80665fd154eb23ca41e9df6f67Chris Lattner return ConstantExpr::getGetElementPtr(Ops[0], Ops+1, NumOps-1); 2465520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner } 2475520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner} 2485520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 2495520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// ConstantFoldLoadThroughGEPConstantExpr - Given a constant and a 2505520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// getelementptr constantexpr, return the constant value being addressed by the 2515520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner/// constant expression, or null if something is funny and we can't decide. 2525520732b24a5a321140dd79af70d321c7ff3dec9Chris LattnerConstant *llvm::ConstantFoldLoadThroughGEPConstantExpr(Constant *C, 2535520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner ConstantExpr *CE) { 2545520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (CE->getOperand(1) != Constant::getNullValue(CE->getOperand(1)->getType())) 2555520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return 0; // Do not allow stepping over the value! 2565520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 2575520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner // Loop over all of the operands, tracking down which value we are 2585520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner // addressing... 2595520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner gep_type_iterator I = gep_type_begin(CE), E = gep_type_end(CE); 2605520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner for (++I; I != E; ++I) 2615520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (const StructType *STy = dyn_cast<StructType>(*I)) { 2625520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner ConstantInt *CU = cast<ConstantInt>(I.getOperand()); 2635520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner assert(CU->getZExtValue() < STy->getNumElements() && 2645520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner "Struct index out of range!"); 2655520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner unsigned El = (unsigned)CU->getZExtValue(); 2665520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) { 2675520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner C = CS->getOperand(El); 2685520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner } else if (isa<ConstantAggregateZero>(C)) { 2695520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner C = Constant::getNullValue(STy->getElementType(El)); 2705520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner } else if (isa<UndefValue>(C)) { 2715520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner C = UndefValue::get(STy->getElementType(El)); 2725520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner } else { 2735520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return 0; 2745520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner } 2755520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner } else if (ConstantInt *CI = dyn_cast<ConstantInt>(I.getOperand())) { 2765520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (const ArrayType *ATy = dyn_cast<ArrayType>(*I)) { 2775520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (CI->getZExtValue() >= ATy->getNumElements()) 2785520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return 0; 2795520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) 2805520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner C = CA->getOperand(CI->getZExtValue()); 2815520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner else if (isa<ConstantAggregateZero>(C)) 2825520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner C = Constant::getNullValue(ATy->getElementType()); 2835520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner else if (isa<UndefValue>(C)) 2845520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner C = UndefValue::get(ATy->getElementType()); 2855520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner else 2865520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return 0; 2879d6565a5b1fbc4286d6ee638d8f47a3171a9ed7eReid Spencer } else if (const VectorType *PTy = dyn_cast<VectorType>(*I)) { 2885520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner if (CI->getZExtValue() >= PTy->getNumElements()) 2895520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return 0; 2909d6565a5b1fbc4286d6ee638d8f47a3171a9ed7eReid Spencer if (ConstantVector *CP = dyn_cast<ConstantVector>(C)) 2915520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner C = CP->getOperand(CI->getZExtValue()); 2925520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner else if (isa<ConstantAggregateZero>(C)) 2935520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner C = Constant::getNullValue(PTy->getElementType()); 2945520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner else if (isa<UndefValue>(C)) 2955520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner C = UndefValue::get(PTy->getElementType()); 2965520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner else 2975520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return 0; 2985520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner } else { 2995520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return 0; 3005520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner } 3015520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner } else { 3025520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return 0; 3035520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner } 3045520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner return C; 3055520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner} 3065520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 3075520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner 308bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell//===----------------------------------------------------------------------===// 3095520732b24a5a321140dd79af70d321c7ff3dec9Chris Lattner// Constant Folding for Calls 310bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell// 311bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 312bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell/// canConstantFoldCallTo - Return true if its even possible to fold a call to 313bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell/// the specified function. 314bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswellbool 315bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswellllvm::canConstantFoldCallTo(Function *F) { 316bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell switch (F->getIntrinsicID()) { 3170b118206bf3411722707f2e5cab8fd2eedcd50d6Reid Spencer case Intrinsic::sqrt_f32: 3180b118206bf3411722707f2e5cab8fd2eedcd50d6Reid Spencer case Intrinsic::sqrt_f64: 319b5282dcf4745be59046f440980a1c0f0a50c9c09Chris Lattner case Intrinsic::powi_f32: 320b5282dcf4745be59046f440980a1c0f0a50c9c09Chris Lattner case Intrinsic::powi_f64: 321e9391fd9b52e93717b365bdd05c471101323a4dfReid Spencer case Intrinsic::bswap: 322e9391fd9b52e93717b365bdd05c471101323a4dfReid Spencer case Intrinsic::ctpop: 323e9391fd9b52e93717b365bdd05c471101323a4dfReid Spencer case Intrinsic::ctlz: 324e9391fd9b52e93717b365bdd05c471101323a4dfReid Spencer case Intrinsic::cttz: 325bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell return true; 326bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell default: break; 327bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 328bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 329c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner const ValueName *NameVal = F->getValueName(); 330c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner const char *Str = NameVal->getKeyData(); 331c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner unsigned Len = NameVal->getKeyLength(); 332c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 0) return false; 333c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner 334c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner // In these cases, the check of the length is required. We don't want to 335c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner // return true for a name like "cos\0blah" which strcmp would return equal to 336c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner // "cos", but has length 8. 337c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner switch (Str[0]) { 338c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner default: return false; 339c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'a': 340c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 4) 341c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return !strcmp(Str, "acos") || !strcmp(Str, "asin") || 342c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner !strcmp(Str, "atan"); 343c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else if (Len == 5) 344c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return !strcmp(Str, "atan2"); 345c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return false; 346c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'c': 347c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 3) 348c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return !strcmp(Str, "cos"); 349c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else if (Len == 4) 350c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return !strcmp(Str, "ceil") || !strcmp(Str, "cosf") || 351c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner !strcmp(Str, "cosh"); 352c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return false; 353c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'e': 354c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 3) 355c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return !strcmp(Str, "exp"); 356c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return false; 357c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'f': 358c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 4) 359c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return !strcmp(Str, "fabs") || !strcmp(Str, "fmod"); 360c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else if (Len == 5) 361c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return !strcmp(Str, "floor"); 362c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return false; 363c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 364c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'l': 365c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 3 && !strcmp(Str, "log")) 366c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return true; 367c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 5 && !strcmp(Str, "log10")) 368c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return true; 369c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return false; 370c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'p': 371c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 3 && !strcmp(Str, "pow")) 372c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return true; 373c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return false; 374c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 's': 375c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 3) 376c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return !strcmp(Str, "sin"); 377c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 4) 378c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return !strcmp(Str, "sinh") || !strcmp(Str, "sqrt"); 379c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 5) 380c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return !strcmp(Str, "sqrtf"); 381c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return false; 382c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 't': 383c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 3 && !strcmp(Str, "tan")) 384c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return true; 385c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else if (Len == 4 && !strcmp(Str, "tanh")) 386c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return true; 387c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return false; 388bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 389bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell} 390bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 39172d88ae5447a3929c97e88f4c806213847b5d988Chris Lattnerstatic Constant *ConstantFoldFP(double (*NativeFP)(double), double V, 39272d88ae5447a3929c97e88f4c806213847b5d988Chris Lattner const Type *Ty) { 393bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell errno = 0; 394bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell V = NativeFP(V); 395bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell if (errno == 0) 396bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell return ConstantFP::get(Ty, V); 39772d88ae5447a3929c97e88f4c806213847b5d988Chris Lattner errno = 0; 398bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell return 0; 399bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell} 400bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 401384152444d22d356f7b4090a158da4cbc1f79464Dan Gohmanstatic Constant *ConstantFoldBinaryFP(double (*NativeFP)(double, double), 402384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman double V, double W, 403384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman const Type *Ty) { 404384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman errno = 0; 405384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman V = NativeFP(V, W); 406384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman if (errno == 0) 407384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman return ConstantFP::get(Ty, V); 408384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman errno = 0; 409384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman return 0; 410384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman} 411384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman 412bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell/// ConstantFoldCall - Attempt to constant fold a call to the specified function 413bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell/// with the specified arguments, returning null if unsuccessful. 414bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John CriswellConstant * 41572d88ae5447a3929c97e88f4c806213847b5d988Chris Lattnerllvm::ConstantFoldCall(Function *F, Constant** Operands, unsigned NumOperands) { 416c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner const ValueName *NameVal = F->getValueName(); 417c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner const char *Str = NameVal->getKeyData(); 418c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner unsigned Len = NameVal->getKeyLength(); 419c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner 420bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell const Type *Ty = F->getReturnType(); 42172d88ae5447a3929c97e88f4c806213847b5d988Chris Lattner if (NumOperands == 1) { 422bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell if (ConstantFP *Op = dyn_cast<ConstantFP>(Operands[0])) { 423bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell double V = Op->getValue(); 424c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner switch (Str[0]) { 425c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'a': 426c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 4 && !strcmp(Str, "acos")) 427c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFoldFP(acos, V, Ty); 428c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else if (Len == 4 && !strcmp(Str, "asin")) 429c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFoldFP(asin, V, Ty); 430c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else if (Len == 4 && !strcmp(Str, "atan")) 431c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFoldFP(atan, V, Ty); 432c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 433c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'c': 434c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 4 && !strcmp(Str, "ceil")) 435c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFoldFP(ceil, V, Ty); 436c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else if (Len == 3 && !strcmp(Str, "cos")) 437c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFoldFP(cos, V, Ty); 438c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else if (Len == 4 && !strcmp(Str, "cosh")) 439c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFoldFP(cosh, V, Ty); 440c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 441c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'e': 442c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 3 && !strcmp(Str, "exp")) 443c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFoldFP(exp, V, Ty); 444c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 445c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'f': 446c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 4 && !strcmp(Str, "fabs")) 447c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFP::get(Ty, fabs(V)); 448c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else if (Len == 5 && !strcmp(Str, "floor")) 449c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFoldFP(floor, V, Ty); 450c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 451c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 'l': 452c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 3 && !strcmp(Str, "log") && V > 0) 453c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFoldFP(log, V, Ty); 454c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else if (Len == 5 && !strcmp(Str, "log10") && V > 0) 455c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFoldFP(log10, V, Ty); 456c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else if (!strcmp(Str, "llvm.sqrt.f32") || 457c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner !strcmp(Str, "llvm.sqrt.f64")) { 458c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (V >= -0.0) 459c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFP::get(Ty, sqrt(V)); 460c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else // Undefined 461c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFP::get(Ty, 0.0); 462c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner } 463c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 464c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 's': 465c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 3 && !strcmp(Str, "sin")) 466c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFoldFP(sin, V, Ty); 467c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else if (Len == 4 && !strcmp(Str, "sinh")) 468c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFoldFP(sinh, V, Ty); 469c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else if (Len == 4 && !strcmp(Str, "sqrt") && V >= 0) 470c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFoldFP(sqrt, V, Ty); 471c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else if (Len == 5 && !strcmp(Str, "sqrtf") && V >= 0) 472c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFoldFP(sqrt, V, Ty); 473c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 474c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner case 't': 475c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 3 && !strcmp(Str, "tan")) 476c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFoldFP(tan, V, Ty); 477c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner else if (Len == 4 && !strcmp(Str, "tanh")) 478c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner return ConstantFoldFP(tanh, V, Ty); 479c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 480c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner default: 481c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner break; 482bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 483b83eb6447ba155342598f0fabe1f08f5baa9164aReid Spencer } else if (ConstantInt *Op = dyn_cast<ConstantInt>(Operands[0])) { 484c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len > 11 && !memcmp(Str, "llvm.bswap", 10)) { 485e9391fd9b52e93717b365bdd05c471101323a4dfReid Spencer return ConstantInt::get(Op->getValue().byteSwap()); 486c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner } else if (Len > 11 && !memcmp(Str, "llvm.ctpop", 10)) { 487e9391fd9b52e93717b365bdd05c471101323a4dfReid Spencer uint64_t ctpop = Op->getValue().countPopulation(); 4886994040a952e5fb27605eb3cf29ed86c4e59cf62Chandler Carruth return ConstantInt::get(Ty, ctpop); 489c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner } else if (Len > 10 && !memcmp(Str, "llvm.cttz", 9)) { 490e9391fd9b52e93717b365bdd05c471101323a4dfReid Spencer uint64_t cttz = Op->getValue().countTrailingZeros(); 4916994040a952e5fb27605eb3cf29ed86c4e59cf62Chandler Carruth return ConstantInt::get(Ty, cttz); 492c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner } else if (Len > 10 && !memcmp(Str, "llvm.ctlz", 9)) { 493e9391fd9b52e93717b365bdd05c471101323a4dfReid Spencer uint64_t ctlz = Op->getValue().countLeadingZeros(); 4946994040a952e5fb27605eb3cf29ed86c4e59cf62Chandler Carruth return ConstantInt::get(Ty, ctlz); 495e9391fd9b52e93717b365bdd05c471101323a4dfReid Spencer } 496bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 49772d88ae5447a3929c97e88f4c806213847b5d988Chris Lattner } else if (NumOperands == 2) { 498bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell if (ConstantFP *Op1 = dyn_cast<ConstantFP>(Operands[0])) { 499bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell double Op1V = Op1->getValue(); 500bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell if (ConstantFP *Op2 = dyn_cast<ConstantFP>(Operands[1])) { 501bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell double Op2V = Op2->getValue(); 502bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 503c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (Len == 3 && !strcmp(Str, "pow")) { 504384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman return ConstantFoldBinaryFP(pow, Op1V, Op2V, Ty); 505c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner } else if (Len == 4 && !strcmp(Str, "fmod")) { 506384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman return ConstantFoldBinaryFP(fmod, Op1V, Op2V, Ty); 507c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner } else if (Len == 5 && !strcmp(Str, "atan2")) { 508384152444d22d356f7b4090a158da4cbc1f79464Dan Gohman return ConstantFoldBinaryFP(atan2, Op1V, Op2V, Ty); 509b5282dcf4745be59046f440980a1c0f0a50c9c09Chris Lattner } 510b5282dcf4745be59046f440980a1c0f0a50c9c09Chris Lattner } else if (ConstantInt *Op2C = dyn_cast<ConstantInt>(Operands[1])) { 511c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner if (!strcmp(Str, "llvm.powi.f32")) { 512b5282dcf4745be59046f440980a1c0f0a50c9c09Chris Lattner return ConstantFP::get(Ty, std::pow((float)Op1V, 513b5282dcf4745be59046f440980a1c0f0a50c9c09Chris Lattner (int)Op2C->getZExtValue())); 514c5f6a1f9d61d74017d90e149728cb3d283e0a0e0Chris Lattner } else if (!strcmp(Str, "llvm.powi.f64")) { 515b5282dcf4745be59046f440980a1c0f0a50c9c09Chris Lattner return ConstantFP::get(Ty, std::pow((double)Op1V, 516b5282dcf4745be59046f440980a1c0f0a50c9c09Chris Lattner (int)Op2C->getZExtValue())); 517b5282dcf4745be59046f440980a1c0f0a50c9c09Chris Lattner } 518bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 519bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 520bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell } 521bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell return 0; 522bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell} 523bd9d37026a5c17d9a51371a6a5446bf4761ee7d6John Criswell 524