408 lines
16 KiB
C++
408 lines
16 KiB
C++
//===-- IntrinsicLowering.cpp - Intrinsic Lowering default implementation -===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the IntrinsicLowering class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/Instructions.h"
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#include "llvm/Type.h"
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#include "llvm/CodeGen/IntrinsicLowering.h"
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#include "llvm/Support/Streams.h"
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using namespace llvm;
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template <class ArgIt>
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static void EnsureFunctionExists(Module &M, const char *Name,
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ArgIt ArgBegin, ArgIt ArgEnd,
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const Type *RetTy) {
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// Insert a correctly-typed definition now.
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std::vector<const Type *> ParamTys;
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for (ArgIt I = ArgBegin; I != ArgEnd; ++I)
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ParamTys.push_back(I->getType());
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M.getOrInsertFunction(Name, FunctionType::get(RetTy, ParamTys, false));
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}
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/// ReplaceCallWith - This function is used when we want to lower an intrinsic
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/// call to a call of an external function. This handles hard cases such as
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/// when there was already a prototype for the external function, and if that
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/// prototype doesn't match the arguments we expect to pass in.
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template <class ArgIt>
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static CallInst *ReplaceCallWith(const char *NewFn, CallInst *CI,
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ArgIt ArgBegin, ArgIt ArgEnd,
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const Type *RetTy, Constant *&FCache) {
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if (!FCache) {
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// If we haven't already looked up this function, check to see if the
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// program already contains a function with this name.
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Module *M = CI->getParent()->getParent()->getParent();
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// Get or insert the definition now.
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std::vector<const Type *> ParamTys;
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for (ArgIt I = ArgBegin; I != ArgEnd; ++I)
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ParamTys.push_back((*I)->getType());
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FCache = M->getOrInsertFunction(NewFn,
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FunctionType::get(RetTy, ParamTys, false));
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}
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std::vector<Value*> Operands(ArgBegin, ArgEnd);
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CallInst *NewCI = new CallInst(FCache, Operands, CI->getName(), CI);
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if (!CI->use_empty())
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CI->replaceAllUsesWith(NewCI);
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return NewCI;
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}
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void IntrinsicLowering::AddPrototypes(Module &M) {
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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if (I->isExternal() && !I->use_empty())
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switch (I->getIntrinsicID()) {
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default: break;
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case Intrinsic::setjmp:
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EnsureFunctionExists(M, "setjmp", I->arg_begin(), I->arg_end(),
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Type::Int32Ty);
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break;
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case Intrinsic::longjmp:
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EnsureFunctionExists(M, "longjmp", I->arg_begin(), I->arg_end(),
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Type::VoidTy);
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break;
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case Intrinsic::siglongjmp:
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EnsureFunctionExists(M, "abort", I->arg_end(), I->arg_end(),
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Type::VoidTy);
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break;
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case Intrinsic::memcpy_i32:
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case Intrinsic::memcpy_i64:
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EnsureFunctionExists(M, "memcpy", I->arg_begin(), --I->arg_end(),
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I->arg_begin()->getType());
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break;
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case Intrinsic::memmove_i32:
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case Intrinsic::memmove_i64:
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EnsureFunctionExists(M, "memmove", I->arg_begin(), --I->arg_end(),
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I->arg_begin()->getType());
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break;
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case Intrinsic::memset_i32:
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case Intrinsic::memset_i64:
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M.getOrInsertFunction("memset", PointerType::get(Type::Int8Ty),
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PointerType::get(Type::Int8Ty),
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Type::Int32Ty, (--(--I->arg_end()))->getType(),
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(Type *)0);
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break;
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case Intrinsic::sqrt_f32:
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case Intrinsic::sqrt_f64:
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if(I->arg_begin()->getType() == Type::FloatTy)
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EnsureFunctionExists(M, "sqrtf", I->arg_begin(), I->arg_end(),
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Type::FloatTy);
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else
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EnsureFunctionExists(M, "sqrt", I->arg_begin(), I->arg_end(),
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Type::DoubleTy);
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break;
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}
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}
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/// LowerBSWAP - Emit the code to lower bswap of V before the specified
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/// instruction IP.
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static Value *LowerBSWAP(Value *V, Instruction *IP) {
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assert(V->getType()->isInteger() && "Can't bswap a non-integer type!");
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unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
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switch(BitSize) {
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default: assert(0 && "Unhandled type size of value to byteswap!");
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case 16: {
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Value *Tmp1 = new ShiftInst(Instruction::Shl, V,
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ConstantInt::get(Type::Int8Ty,8),"bswap.2",IP);
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Value *Tmp2 = new ShiftInst(Instruction::LShr, V,
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ConstantInt::get(Type::Int8Ty,8),"bswap.1",IP);
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V = BinaryOperator::createOr(Tmp1, Tmp2, "bswap.i16", IP);
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break;
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}
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case 32: {
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Value *Tmp4 = new ShiftInst(Instruction::Shl, V,
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ConstantInt::get(Type::Int8Ty,24),"bswap.4", IP);
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Value *Tmp3 = new ShiftInst(Instruction::Shl, V,
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ConstantInt::get(Type::Int8Ty,8),"bswap.3",IP);
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Value *Tmp2 = new ShiftInst(Instruction::LShr, V,
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ConstantInt::get(Type::Int8Ty,8),"bswap.2",IP);
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Value *Tmp1 = new ShiftInst(Instruction::LShr, V,
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ConstantInt::get(Type::Int8Ty,24),"bswap.1", IP);
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Tmp3 = BinaryOperator::createAnd(Tmp3,
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ConstantInt::get(Type::Int32Ty, 0xFF0000),
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"bswap.and3", IP);
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Tmp2 = BinaryOperator::createAnd(Tmp2,
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ConstantInt::get(Type::Int32Ty, 0xFF00),
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"bswap.and2", IP);
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Tmp4 = BinaryOperator::createOr(Tmp4, Tmp3, "bswap.or1", IP);
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Tmp2 = BinaryOperator::createOr(Tmp2, Tmp1, "bswap.or2", IP);
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V = BinaryOperator::createOr(Tmp4, Tmp3, "bswap.i32", IP);
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break;
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}
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case 64: {
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Value *Tmp8 = new ShiftInst(Instruction::Shl, V,
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ConstantInt::get(Type::Int8Ty,56),"bswap.8", IP);
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Value *Tmp7 = new ShiftInst(Instruction::Shl, V,
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ConstantInt::get(Type::Int8Ty,40),"bswap.7", IP);
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Value *Tmp6 = new ShiftInst(Instruction::Shl, V,
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ConstantInt::get(Type::Int8Ty,24),"bswap.6", IP);
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Value *Tmp5 = new ShiftInst(Instruction::Shl, V,
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ConstantInt::get(Type::Int8Ty,8),"bswap.5", IP);
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Value* Tmp4 = new ShiftInst(Instruction::LShr, V,
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ConstantInt::get(Type::Int8Ty,8),"bswap.4", IP);
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Value* Tmp3 = new ShiftInst(Instruction::LShr, V,
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ConstantInt::get(Type::Int8Ty,24),"bswap.3", IP);
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Value* Tmp2 = new ShiftInst(Instruction::LShr, V,
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ConstantInt::get(Type::Int8Ty,40),"bswap.2", IP);
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Value* Tmp1 = new ShiftInst(Instruction::LShr, V,
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ConstantInt::get(Type::Int8Ty,56),"bswap.1", IP);
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Tmp7 = BinaryOperator::createAnd(Tmp7,
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ConstantInt::get(Type::Int64Ty,
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0xFF000000000000ULL),
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"bswap.and7", IP);
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Tmp6 = BinaryOperator::createAnd(Tmp6,
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ConstantInt::get(Type::Int64Ty, 0xFF0000000000ULL),
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"bswap.and6", IP);
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Tmp5 = BinaryOperator::createAnd(Tmp5,
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ConstantInt::get(Type::Int64Ty, 0xFF00000000ULL),
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"bswap.and5", IP);
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Tmp4 = BinaryOperator::createAnd(Tmp4,
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ConstantInt::get(Type::Int64Ty, 0xFF000000ULL),
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"bswap.and4", IP);
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Tmp3 = BinaryOperator::createAnd(Tmp3,
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ConstantInt::get(Type::Int64Ty, 0xFF0000ULL),
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"bswap.and3", IP);
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Tmp2 = BinaryOperator::createAnd(Tmp2,
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ConstantInt::get(Type::Int64Ty, 0xFF00ULL),
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"bswap.and2", IP);
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Tmp8 = BinaryOperator::createOr(Tmp8, Tmp7, "bswap.or1", IP);
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Tmp6 = BinaryOperator::createOr(Tmp6, Tmp5, "bswap.or2", IP);
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Tmp4 = BinaryOperator::createOr(Tmp4, Tmp3, "bswap.or3", IP);
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Tmp2 = BinaryOperator::createOr(Tmp2, Tmp1, "bswap.or4", IP);
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Tmp8 = BinaryOperator::createOr(Tmp8, Tmp6, "bswap.or5", IP);
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Tmp4 = BinaryOperator::createOr(Tmp4, Tmp2, "bswap.or6", IP);
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V = BinaryOperator::createOr(Tmp8, Tmp4, "bswap.i64", IP);
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break;
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}
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}
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return V;
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}
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/// LowerCTPOP - Emit the code to lower ctpop of V before the specified
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/// instruction IP.
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static Value *LowerCTPOP(Value *V, Instruction *IP) {
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assert(V->getType()->isInteger() && "Can't ctpop a non-integer type!");
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static const uint64_t MaskValues[6] = {
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0x5555555555555555ULL, 0x3333333333333333ULL,
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0x0F0F0F0F0F0F0F0FULL, 0x00FF00FF00FF00FFULL,
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0x0000FFFF0000FFFFULL, 0x00000000FFFFFFFFULL
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};
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unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
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for (unsigned i = 1, ct = 0; i != BitSize; i <<= 1, ++ct) {
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Value *MaskCst = ConstantInt::get(V->getType(), MaskValues[ct]);
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Value *LHS = BinaryOperator::createAnd(V, MaskCst, "cppop.and1", IP);
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Value *VShift = new ShiftInst(Instruction::LShr, V,
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ConstantInt::get(Type::Int8Ty, i), "ctpop.sh", IP);
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Value *RHS = BinaryOperator::createAnd(VShift, MaskCst, "cppop.and2", IP);
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V = BinaryOperator::createAdd(LHS, RHS, "ctpop.step", IP);
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}
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return V;
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}
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/// LowerCTLZ - Emit the code to lower ctlz of V before the specified
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/// instruction IP.
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static Value *LowerCTLZ(Value *V, Instruction *IP) {
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unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
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for (unsigned i = 1; i != BitSize; i <<= 1) {
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Value *ShVal = ConstantInt::get(Type::Int8Ty, i);
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ShVal = new ShiftInst(Instruction::LShr, V, ShVal, "ctlz.sh", IP);
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V = BinaryOperator::createOr(V, ShVal, "ctlz.step", IP);
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}
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V = BinaryOperator::createNot(V, "", IP);
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return LowerCTPOP(V, IP);
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}
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void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
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Function *Callee = CI->getCalledFunction();
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assert(Callee && "Cannot lower an indirect call!");
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switch (Callee->getIntrinsicID()) {
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case Intrinsic::not_intrinsic:
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cerr << "Cannot lower a call to a non-intrinsic function '"
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<< Callee->getName() << "'!\n";
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abort();
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default:
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cerr << "Error: Code generator does not support intrinsic function '"
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<< Callee->getName() << "'!\n";
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abort();
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// The setjmp/longjmp intrinsics should only exist in the code if it was
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// never optimized (ie, right out of the CFE), or if it has been hacked on
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// by the lowerinvoke pass. In both cases, the right thing to do is to
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// convert the call to an explicit setjmp or longjmp call.
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case Intrinsic::setjmp: {
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static Constant *SetjmpFCache = 0;
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Value *V = ReplaceCallWith("setjmp", CI, CI->op_begin()+1, CI->op_end(),
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Type::Int32Ty, SetjmpFCache);
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if (CI->getType() != Type::VoidTy)
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CI->replaceAllUsesWith(V);
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break;
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}
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case Intrinsic::sigsetjmp:
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if (CI->getType() != Type::VoidTy)
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CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
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break;
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case Intrinsic::longjmp: {
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static Constant *LongjmpFCache = 0;
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ReplaceCallWith("longjmp", CI, CI->op_begin()+1, CI->op_end(),
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Type::VoidTy, LongjmpFCache);
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break;
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}
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case Intrinsic::siglongjmp: {
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// Insert the call to abort
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static Constant *AbortFCache = 0;
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ReplaceCallWith("abort", CI, CI->op_end(), CI->op_end(),
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Type::VoidTy, AbortFCache);
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break;
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}
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case Intrinsic::ctpop_i8:
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case Intrinsic::ctpop_i16:
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case Intrinsic::ctpop_i32:
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case Intrinsic::ctpop_i64:
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CI->replaceAllUsesWith(LowerCTPOP(CI->getOperand(1), CI));
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break;
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case Intrinsic::bswap_i16:
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case Intrinsic::bswap_i32:
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case Intrinsic::bswap_i64:
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CI->replaceAllUsesWith(LowerBSWAP(CI->getOperand(1), CI));
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break;
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case Intrinsic::ctlz_i8:
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case Intrinsic::ctlz_i16:
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case Intrinsic::ctlz_i32:
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case Intrinsic::ctlz_i64:
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CI->replaceAllUsesWith(LowerCTLZ(CI->getOperand(1), CI));
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break;
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case Intrinsic::cttz_i8:
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case Intrinsic::cttz_i16:
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case Intrinsic::cttz_i32:
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case Intrinsic::cttz_i64: {
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// cttz(x) -> ctpop(~X & (X-1))
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Value *Src = CI->getOperand(1);
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Value *NotSrc = BinaryOperator::createNot(Src, Src->getName()+".not", CI);
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Value *SrcM1 = ConstantInt::get(Src->getType(), 1);
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SrcM1 = BinaryOperator::createSub(Src, SrcM1, "", CI);
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Src = LowerCTPOP(BinaryOperator::createAnd(NotSrc, SrcM1, "", CI), CI);
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CI->replaceAllUsesWith(Src);
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break;
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}
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case Intrinsic::stacksave:
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case Intrinsic::stackrestore: {
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static bool Warned = false;
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if (!Warned)
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cerr << "WARNING: this target does not support the llvm.stack"
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<< (Callee->getIntrinsicID() == Intrinsic::stacksave ?
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"save" : "restore") << " intrinsic.\n";
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Warned = true;
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if (Callee->getIntrinsicID() == Intrinsic::stacksave)
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CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
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break;
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}
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case Intrinsic::returnaddress:
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case Intrinsic::frameaddress:
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cerr << "WARNING: this target does not support the llvm."
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<< (Callee->getIntrinsicID() == Intrinsic::returnaddress ?
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"return" : "frame") << "address intrinsic.\n";
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CI->replaceAllUsesWith(ConstantPointerNull::get(
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cast<PointerType>(CI->getType())));
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break;
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case Intrinsic::prefetch:
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break; // Simply strip out prefetches on unsupported architectures
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case Intrinsic::pcmarker:
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break; // Simply strip out pcmarker on unsupported architectures
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case Intrinsic::readcyclecounter: {
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cerr << "WARNING: this target does not support the llvm.readcyclecoun"
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<< "ter intrinsic. It is being lowered to a constant 0\n";
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CI->replaceAllUsesWith(ConstantInt::get(Type::Int64Ty, 0));
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break;
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}
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case Intrinsic::dbg_stoppoint:
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case Intrinsic::dbg_region_start:
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case Intrinsic::dbg_region_end:
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case Intrinsic::dbg_func_start:
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case Intrinsic::dbg_declare:
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break; // Simply strip out debugging intrinsics
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case Intrinsic::memcpy_i32: {
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static Constant *MemcpyFCache = 0;
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ReplaceCallWith("memcpy", CI, CI->op_begin()+1, CI->op_end()-1,
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(*(CI->op_begin()+1))->getType(), MemcpyFCache);
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break;
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}
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case Intrinsic::memcpy_i64: {
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static Constant *MemcpyFCache = 0;
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ReplaceCallWith("memcpy", CI, CI->op_begin()+1, CI->op_end()-1,
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(*(CI->op_begin()+1))->getType(), MemcpyFCache);
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break;
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}
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case Intrinsic::memmove_i32: {
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static Constant *MemmoveFCache = 0;
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ReplaceCallWith("memmove", CI, CI->op_begin()+1, CI->op_end()-1,
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(*(CI->op_begin()+1))->getType(), MemmoveFCache);
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break;
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}
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case Intrinsic::memmove_i64: {
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static Constant *MemmoveFCache = 0;
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ReplaceCallWith("memmove", CI, CI->op_begin()+1, CI->op_end()-1,
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(*(CI->op_begin()+1))->getType(), MemmoveFCache);
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break;
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}
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case Intrinsic::memset_i32: {
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static Constant *MemsetFCache = 0;
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ReplaceCallWith("memset", CI, CI->op_begin()+1, CI->op_end()-1,
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(*(CI->op_begin()+1))->getType(), MemsetFCache);
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}
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case Intrinsic::memset_i64: {
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static Constant *MemsetFCache = 0;
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ReplaceCallWith("memset", CI, CI->op_begin()+1, CI->op_end()-1,
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(*(CI->op_begin()+1))->getType(), MemsetFCache);
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break;
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}
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case Intrinsic::sqrt_f32: {
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static Constant *sqrtfFCache = 0;
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ReplaceCallWith("sqrtf", CI, CI->op_begin()+1, CI->op_end(),
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Type::FloatTy, sqrtfFCache);
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break;
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}
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case Intrinsic::sqrt_f64: {
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static Constant *sqrtFCache = 0;
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ReplaceCallWith("sqrt", CI, CI->op_begin()+1, CI->op_end(),
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Type::DoubleTy, sqrtFCache);
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break;
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}
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}
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assert(CI->use_empty() &&
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"Lowering should have eliminated any uses of the intrinsic call!");
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CI->eraseFromParent();
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}
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