566 lines
21 KiB
C++
566 lines
21 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 is distributed under the University of Illinois Open Source
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// 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/CodeGen/IntrinsicLowering.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/IRBuilder.h"
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#include "llvm/Module.h"
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#include "llvm/Type.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/CallSite.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/DataLayout.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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Type *RetTy) {
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// Insert a correctly-typed definition now.
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std::vector<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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static void EnsureFPIntrinsicsExist(Module &M, Function *Fn,
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const char *FName,
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const char *DName, const char *LDName) {
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// Insert definitions for all the floating point types.
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switch((int)Fn->arg_begin()->getType()->getTypeID()) {
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case Type::FloatTyID:
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EnsureFunctionExists(M, FName, Fn->arg_begin(), Fn->arg_end(),
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Type::getFloatTy(M.getContext()));
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break;
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case Type::DoubleTyID:
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EnsureFunctionExists(M, DName, Fn->arg_begin(), Fn->arg_end(),
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Type::getDoubleTy(M.getContext()));
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break;
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case Type::X86_FP80TyID:
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case Type::FP128TyID:
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case Type::PPC_FP128TyID:
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EnsureFunctionExists(M, LDName, Fn->arg_begin(), Fn->arg_end(),
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Fn->arg_begin()->getType());
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break;
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}
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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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Type *RetTy) {
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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<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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Constant* FCache = M->getOrInsertFunction(NewFn,
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FunctionType::get(RetTy, ParamTys, false));
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IRBuilder<> Builder(CI->getParent(), CI);
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SmallVector<Value *, 8> Args(ArgBegin, ArgEnd);
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CallInst *NewCI = Builder.CreateCall(FCache, Args);
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NewCI->setName(CI->getName());
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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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// VisualStudio defines setjmp as _setjmp
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#if defined(_MSC_VER) && defined(setjmp) && \
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!defined(setjmp_undefined_for_msvc)
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# pragma push_macro("setjmp")
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# undef setjmp
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# define setjmp_undefined_for_msvc
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#endif
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void IntrinsicLowering::AddPrototypes(Module &M) {
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LLVMContext &Context = M.getContext();
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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if (I->isDeclaration() && !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::getInt32Ty(M.getContext()));
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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::getVoidTy(M.getContext()));
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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::getVoidTy(M.getContext()));
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break;
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case Intrinsic::memcpy:
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M.getOrInsertFunction("memcpy",
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Type::getInt8PtrTy(Context),
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Type::getInt8PtrTy(Context),
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Type::getInt8PtrTy(Context),
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TD.getIntPtrType(Context), (Type *)0);
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break;
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case Intrinsic::memmove:
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M.getOrInsertFunction("memmove",
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Type::getInt8PtrTy(Context),
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Type::getInt8PtrTy(Context),
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Type::getInt8PtrTy(Context),
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TD.getIntPtrType(Context), (Type *)0);
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break;
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case Intrinsic::memset:
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M.getOrInsertFunction("memset",
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Type::getInt8PtrTy(Context),
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Type::getInt8PtrTy(Context),
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Type::getInt32Ty(M.getContext()),
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TD.getIntPtrType(Context), (Type *)0);
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break;
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case Intrinsic::sqrt:
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EnsureFPIntrinsicsExist(M, I, "sqrtf", "sqrt", "sqrtl");
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break;
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case Intrinsic::sin:
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EnsureFPIntrinsicsExist(M, I, "sinf", "sin", "sinl");
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break;
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case Intrinsic::cos:
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EnsureFPIntrinsicsExist(M, I, "cosf", "cos", "cosl");
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break;
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case Intrinsic::pow:
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EnsureFPIntrinsicsExist(M, I, "powf", "pow", "powl");
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break;
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case Intrinsic::log:
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EnsureFPIntrinsicsExist(M, I, "logf", "log", "logl");
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break;
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case Intrinsic::log2:
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EnsureFPIntrinsicsExist(M, I, "log2f", "log2", "log2l");
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break;
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case Intrinsic::log10:
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EnsureFPIntrinsicsExist(M, I, "log10f", "log10", "log10l");
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break;
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case Intrinsic::exp:
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EnsureFPIntrinsicsExist(M, I, "expf", "exp", "expl");
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break;
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case Intrinsic::exp2:
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EnsureFPIntrinsicsExist(M, I, "exp2f", "exp2", "exp2l");
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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(LLVMContext &Context, Value *V, Instruction *IP) {
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assert(V->getType()->isIntegerTy() && "Can't bswap a non-integer type!");
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unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
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IRBuilder<> Builder(IP->getParent(), IP);
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switch(BitSize) {
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default: llvm_unreachable("Unhandled type size of value to byteswap!");
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case 16: {
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Value *Tmp1 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 8),
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"bswap.2");
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Value *Tmp2 = Builder.CreateLShr(V, ConstantInt::get(V->getType(), 8),
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"bswap.1");
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V = Builder.CreateOr(Tmp1, Tmp2, "bswap.i16");
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break;
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}
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case 32: {
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Value *Tmp4 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 24),
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"bswap.4");
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Value *Tmp3 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 8),
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"bswap.3");
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Value *Tmp2 = Builder.CreateLShr(V, ConstantInt::get(V->getType(), 8),
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"bswap.2");
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Value *Tmp1 = Builder.CreateLShr(V,ConstantInt::get(V->getType(), 24),
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"bswap.1");
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Tmp3 = Builder.CreateAnd(Tmp3,
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ConstantInt::get(Type::getInt32Ty(Context), 0xFF0000),
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"bswap.and3");
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Tmp2 = Builder.CreateAnd(Tmp2,
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ConstantInt::get(Type::getInt32Ty(Context), 0xFF00),
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"bswap.and2");
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Tmp4 = Builder.CreateOr(Tmp4, Tmp3, "bswap.or1");
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Tmp2 = Builder.CreateOr(Tmp2, Tmp1, "bswap.or2");
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V = Builder.CreateOr(Tmp4, Tmp2, "bswap.i32");
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break;
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}
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case 64: {
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Value *Tmp8 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 56),
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"bswap.8");
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Value *Tmp7 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 40),
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"bswap.7");
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Value *Tmp6 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 24),
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"bswap.6");
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Value *Tmp5 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 8),
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"bswap.5");
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Value* Tmp4 = Builder.CreateLShr(V, ConstantInt::get(V->getType(), 8),
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"bswap.4");
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Value* Tmp3 = Builder.CreateLShr(V,
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ConstantInt::get(V->getType(), 24),
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"bswap.3");
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Value* Tmp2 = Builder.CreateLShr(V,
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ConstantInt::get(V->getType(), 40),
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"bswap.2");
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Value* Tmp1 = Builder.CreateLShr(V,
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ConstantInt::get(V->getType(), 56),
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"bswap.1");
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Tmp7 = Builder.CreateAnd(Tmp7,
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ConstantInt::get(Type::getInt64Ty(Context),
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0xFF000000000000ULL),
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"bswap.and7");
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Tmp6 = Builder.CreateAnd(Tmp6,
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ConstantInt::get(Type::getInt64Ty(Context),
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0xFF0000000000ULL),
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"bswap.and6");
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Tmp5 = Builder.CreateAnd(Tmp5,
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ConstantInt::get(Type::getInt64Ty(Context),
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0xFF00000000ULL),
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"bswap.and5");
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Tmp4 = Builder.CreateAnd(Tmp4,
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ConstantInt::get(Type::getInt64Ty(Context),
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0xFF000000ULL),
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"bswap.and4");
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Tmp3 = Builder.CreateAnd(Tmp3,
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ConstantInt::get(Type::getInt64Ty(Context),
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0xFF0000ULL),
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"bswap.and3");
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Tmp2 = Builder.CreateAnd(Tmp2,
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ConstantInt::get(Type::getInt64Ty(Context),
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0xFF00ULL),
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"bswap.and2");
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Tmp8 = Builder.CreateOr(Tmp8, Tmp7, "bswap.or1");
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Tmp6 = Builder.CreateOr(Tmp6, Tmp5, "bswap.or2");
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Tmp4 = Builder.CreateOr(Tmp4, Tmp3, "bswap.or3");
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Tmp2 = Builder.CreateOr(Tmp2, Tmp1, "bswap.or4");
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Tmp8 = Builder.CreateOr(Tmp8, Tmp6, "bswap.or5");
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Tmp4 = Builder.CreateOr(Tmp4, Tmp2, "bswap.or6");
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V = Builder.CreateOr(Tmp8, Tmp4, "bswap.i64");
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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(LLVMContext &Context, Value *V, Instruction *IP) {
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assert(V->getType()->isIntegerTy() && "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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IRBuilder<> Builder(IP->getParent(), IP);
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unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
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unsigned WordSize = (BitSize + 63) / 64;
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Value *Count = ConstantInt::get(V->getType(), 0);
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for (unsigned n = 0; n < WordSize; ++n) {
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Value *PartValue = V;
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for (unsigned i = 1, ct = 0; i < (BitSize>64 ? 64 : BitSize);
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i <<= 1, ++ct) {
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Value *MaskCst = ConstantInt::get(V->getType(), MaskValues[ct]);
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Value *LHS = Builder.CreateAnd(PartValue, MaskCst, "cppop.and1");
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Value *VShift = Builder.CreateLShr(PartValue,
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ConstantInt::get(V->getType(), i),
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"ctpop.sh");
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Value *RHS = Builder.CreateAnd(VShift, MaskCst, "cppop.and2");
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PartValue = Builder.CreateAdd(LHS, RHS, "ctpop.step");
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}
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Count = Builder.CreateAdd(PartValue, Count, "ctpop.part");
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if (BitSize > 64) {
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V = Builder.CreateLShr(V, ConstantInt::get(V->getType(), 64),
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"ctpop.part.sh");
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BitSize -= 64;
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}
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}
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return Count;
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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(LLVMContext &Context, Value *V, Instruction *IP) {
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IRBuilder<> Builder(IP->getParent(), 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(V->getType(), i);
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ShVal = Builder.CreateLShr(V, ShVal, "ctlz.sh");
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V = Builder.CreateOr(V, ShVal, "ctlz.step");
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}
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V = Builder.CreateNot(V);
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return LowerCTPOP(Context, V, IP);
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}
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static void ReplaceFPIntrinsicWithCall(CallInst *CI, const char *Fname,
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const char *Dname,
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const char *LDname) {
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CallSite CS(CI);
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switch (CI->getArgOperand(0)->getType()->getTypeID()) {
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default: llvm_unreachable("Invalid type in intrinsic");
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case Type::FloatTyID:
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ReplaceCallWith(Fname, CI, CS.arg_begin(), CS.arg_end(),
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Type::getFloatTy(CI->getContext()));
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break;
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case Type::DoubleTyID:
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ReplaceCallWith(Dname, CI, CS.arg_begin(), CS.arg_end(),
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Type::getDoubleTy(CI->getContext()));
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break;
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case Type::X86_FP80TyID:
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case Type::FP128TyID:
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case Type::PPC_FP128TyID:
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ReplaceCallWith(LDname, CI, CS.arg_begin(), CS.arg_end(),
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CI->getArgOperand(0)->getType());
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break;
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}
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}
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void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
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IRBuilder<> Builder(CI->getParent(), CI);
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LLVMContext &Context = CI->getContext();
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const Function *Callee = CI->getCalledFunction();
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assert(Callee && "Cannot lower an indirect call!");
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CallSite CS(CI);
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switch (Callee->getIntrinsicID()) {
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case Intrinsic::not_intrinsic:
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report_fatal_error("Cannot lower a call to a non-intrinsic function '"+
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Callee->getName() + "'!");
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default:
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report_fatal_error("Code generator does not support intrinsic function '"+
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Callee->getName()+"'!");
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case Intrinsic::expect: {
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// Just replace __builtin_expect(exp, c) with EXP.
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Value *V = CI->getArgOperand(0);
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CI->replaceAllUsesWith(V);
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break;
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}
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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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Value *V = ReplaceCallWith("setjmp", CI, CS.arg_begin(), CS.arg_end(),
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Type::getInt32Ty(Context));
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if (!CI->getType()->isVoidTy())
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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()->isVoidTy())
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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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ReplaceCallWith("longjmp", CI, CS.arg_begin(), CS.arg_end(),
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Type::getVoidTy(Context));
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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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ReplaceCallWith("abort", CI, CS.arg_end(), CS.arg_end(),
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Type::getVoidTy(Context));
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break;
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}
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case Intrinsic::ctpop:
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CI->replaceAllUsesWith(LowerCTPOP(Context, CI->getArgOperand(0), CI));
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break;
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case Intrinsic::bswap:
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CI->replaceAllUsesWith(LowerBSWAP(Context, CI->getArgOperand(0), CI));
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break;
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case Intrinsic::ctlz:
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CI->replaceAllUsesWith(LowerCTLZ(Context, CI->getArgOperand(0), CI));
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break;
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case Intrinsic::cttz: {
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// cttz(x) -> ctpop(~X & (X-1))
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Value *Src = CI->getArgOperand(0);
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Value *NotSrc = Builder.CreateNot(Src);
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NotSrc->setName(Src->getName() + ".not");
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Value *SrcM1 = ConstantInt::get(Src->getType(), 1);
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SrcM1 = Builder.CreateSub(Src, SrcM1);
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Src = LowerCTPOP(Context, Builder.CreateAnd(NotSrc, SrcM1), 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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if (!Warned)
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errs() << "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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errs() << "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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errs() << "WARNING: this target does not support the llvm.readcyclecoun"
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<< "ter intrinsic. It is being lowered to a constant 0\n";
|
|
CI->replaceAllUsesWith(ConstantInt::get(Type::getInt64Ty(Context), 0));
|
|
break;
|
|
}
|
|
|
|
case Intrinsic::dbg_declare:
|
|
break; // Simply strip out debugging intrinsics
|
|
|
|
case Intrinsic::eh_typeid_for:
|
|
// Return something different to eh_selector.
|
|
CI->replaceAllUsesWith(ConstantInt::get(CI->getType(), 1));
|
|
break;
|
|
|
|
case Intrinsic::var_annotation:
|
|
break; // Strip out annotate intrinsic
|
|
|
|
case Intrinsic::memcpy: {
|
|
Type *IntPtr = TD.getIntPtrType(Context);
|
|
Value *Size = Builder.CreateIntCast(CI->getArgOperand(2), IntPtr,
|
|
/* isSigned */ false);
|
|
Value *Ops[3];
|
|
Ops[0] = CI->getArgOperand(0);
|
|
Ops[1] = CI->getArgOperand(1);
|
|
Ops[2] = Size;
|
|
ReplaceCallWith("memcpy", CI, Ops, Ops+3, CI->getArgOperand(0)->getType());
|
|
break;
|
|
}
|
|
case Intrinsic::memmove: {
|
|
Type *IntPtr = TD.getIntPtrType(Context);
|
|
Value *Size = Builder.CreateIntCast(CI->getArgOperand(2), IntPtr,
|
|
/* isSigned */ false);
|
|
Value *Ops[3];
|
|
Ops[0] = CI->getArgOperand(0);
|
|
Ops[1] = CI->getArgOperand(1);
|
|
Ops[2] = Size;
|
|
ReplaceCallWith("memmove", CI, Ops, Ops+3, CI->getArgOperand(0)->getType());
|
|
break;
|
|
}
|
|
case Intrinsic::memset: {
|
|
Type *IntPtr = TD.getIntPtrType(Context);
|
|
Value *Size = Builder.CreateIntCast(CI->getArgOperand(2), IntPtr,
|
|
/* isSigned */ false);
|
|
Value *Ops[3];
|
|
Ops[0] = CI->getArgOperand(0);
|
|
// Extend the amount to i32.
|
|
Ops[1] = Builder.CreateIntCast(CI->getArgOperand(1),
|
|
Type::getInt32Ty(Context),
|
|
/* isSigned */ false);
|
|
Ops[2] = Size;
|
|
ReplaceCallWith("memset", CI, Ops, Ops+3, CI->getArgOperand(0)->getType());
|
|
break;
|
|
}
|
|
case Intrinsic::sqrt: {
|
|
ReplaceFPIntrinsicWithCall(CI, "sqrtf", "sqrt", "sqrtl");
|
|
break;
|
|
}
|
|
case Intrinsic::log: {
|
|
ReplaceFPIntrinsicWithCall(CI, "logf", "log", "logl");
|
|
break;
|
|
}
|
|
case Intrinsic::log2: {
|
|
ReplaceFPIntrinsicWithCall(CI, "log2f", "log2", "log2l");
|
|
break;
|
|
}
|
|
case Intrinsic::log10: {
|
|
ReplaceFPIntrinsicWithCall(CI, "log10f", "log10", "log10l");
|
|
break;
|
|
}
|
|
case Intrinsic::exp: {
|
|
ReplaceFPIntrinsicWithCall(CI, "expf", "exp", "expl");
|
|
break;
|
|
}
|
|
case Intrinsic::exp2: {
|
|
ReplaceFPIntrinsicWithCall(CI, "exp2f", "exp2", "exp2l");
|
|
break;
|
|
}
|
|
case Intrinsic::pow: {
|
|
ReplaceFPIntrinsicWithCall(CI, "powf", "pow", "powl");
|
|
break;
|
|
}
|
|
case Intrinsic::flt_rounds:
|
|
// Lower to "round to the nearest"
|
|
if (!CI->getType()->isVoidTy())
|
|
CI->replaceAllUsesWith(ConstantInt::get(CI->getType(), 1));
|
|
break;
|
|
case Intrinsic::invariant_start:
|
|
case Intrinsic::lifetime_start:
|
|
// Discard region information.
|
|
CI->replaceAllUsesWith(UndefValue::get(CI->getType()));
|
|
break;
|
|
case Intrinsic::invariant_end:
|
|
case Intrinsic::lifetime_end:
|
|
// Discard region information.
|
|
break;
|
|
}
|
|
|
|
assert(CI->use_empty() &&
|
|
"Lowering should have eliminated any uses of the intrinsic call!");
|
|
CI->eraseFromParent();
|
|
}
|
|
|
|
bool IntrinsicLowering::LowerToByteSwap(CallInst *CI) {
|
|
// Verify this is a simple bswap.
|
|
if (CI->getNumArgOperands() != 1 ||
|
|
CI->getType() != CI->getArgOperand(0)->getType() ||
|
|
!CI->getType()->isIntegerTy())
|
|
return false;
|
|
|
|
IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
|
|
if (!Ty)
|
|
return false;
|
|
|
|
// Okay, we can do this xform, do so now.
|
|
Module *M = CI->getParent()->getParent()->getParent();
|
|
Constant *Int = Intrinsic::getDeclaration(M, Intrinsic::bswap, Ty);
|
|
|
|
Value *Op = CI->getArgOperand(0);
|
|
Op = CallInst::Create(Int, Op, CI->getName(), CI);
|
|
|
|
CI->replaceAllUsesWith(Op);
|
|
CI->eraseFromParent();
|
|
return true;
|
|
}
|