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llvm-mirror/lib/CodeGen/IntrinsicLowering.cpp
Chandler Carruth 4b51f99c87 Move llvm/Support/IRBuilder.h -> llvm/IRBuilder.h 
This was always part of the VMCore library out of necessity -- it deals
entirely in the IR. The .cpp file in fact was already part of the VMCore
library. This is just a mechanical move.

I've tried to go through and re-apply the coding standard's preferred
header sort, but at 40-ish files, I may have gotten some wrong. Please
let me know if so.

I'll be committing the corresponding updates to Clang and Polly, and
Duncan has DragonEgg.

Thanks to Bill and Eric for giving the green light for this bit of cleanup.

llvm-svn: 159421
2012-06-29 12:38:19 +00:00

566 lines
21 KiB
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//===-- IntrinsicLowering.cpp - Intrinsic Lowering default implementation -===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the IntrinsicLowering class.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/IntrinsicLowering.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/IRBuilder.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetData.h"
using namespace llvm;
template <class ArgIt>
static void EnsureFunctionExists(Module &M, const char *Name,
ArgIt ArgBegin, ArgIt ArgEnd,
Type *RetTy) {
// Insert a correctly-typed definition now.
std::vector<Type *> ParamTys;
for (ArgIt I = ArgBegin; I != ArgEnd; ++I)
ParamTys.push_back(I->getType());
M.getOrInsertFunction(Name, FunctionType::get(RetTy, ParamTys, false));
}
static void EnsureFPIntrinsicsExist(Module &M, Function *Fn,
const char *FName,
const char *DName, const char *LDName) {
// Insert definitions for all the floating point types.
switch((int)Fn->arg_begin()->getType()->getTypeID()) {
case Type::FloatTyID:
EnsureFunctionExists(M, FName, Fn->arg_begin(), Fn->arg_end(),
Type::getFloatTy(M.getContext()));
break;
case Type::DoubleTyID:
EnsureFunctionExists(M, DName, Fn->arg_begin(), Fn->arg_end(),
Type::getDoubleTy(M.getContext()));
break;
case Type::X86_FP80TyID:
case Type::FP128TyID:
case Type::PPC_FP128TyID:
EnsureFunctionExists(M, LDName, Fn->arg_begin(), Fn->arg_end(),
Fn->arg_begin()->getType());
break;
}
}
/// ReplaceCallWith - This function is used when we want to lower an intrinsic
/// call to a call of an external function. This handles hard cases such as
/// when there was already a prototype for the external function, and if that
/// prototype doesn't match the arguments we expect to pass in.
template <class ArgIt>
static CallInst *ReplaceCallWith(const char *NewFn, CallInst *CI,
ArgIt ArgBegin, ArgIt ArgEnd,
Type *RetTy) {
// If we haven't already looked up this function, check to see if the
// program already contains a function with this name.
Module *M = CI->getParent()->getParent()->getParent();
// Get or insert the definition now.
std::vector<Type *> ParamTys;
for (ArgIt I = ArgBegin; I != ArgEnd; ++I)
ParamTys.push_back((*I)->getType());
Constant* FCache = M->getOrInsertFunction(NewFn,
FunctionType::get(RetTy, ParamTys, false));
IRBuilder<> Builder(CI->getParent(), CI);
SmallVector<Value *, 8> Args(ArgBegin, ArgEnd);
CallInst *NewCI = Builder.CreateCall(FCache, Args);
NewCI->setName(CI->getName());
if (!CI->use_empty())
CI->replaceAllUsesWith(NewCI);
return NewCI;
}
// VisualStudio defines setjmp as _setjmp
#if defined(_MSC_VER) && defined(setjmp) && \
!defined(setjmp_undefined_for_msvc)
# pragma push_macro("setjmp")
# undef setjmp
# define setjmp_undefined_for_msvc
#endif
void IntrinsicLowering::AddPrototypes(Module &M) {
LLVMContext &Context = M.getContext();
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
if (I->isDeclaration() && !I->use_empty())
switch (I->getIntrinsicID()) {
default: break;
case Intrinsic::setjmp:
EnsureFunctionExists(M, "setjmp", I->arg_begin(), I->arg_end(),
Type::getInt32Ty(M.getContext()));
break;
case Intrinsic::longjmp:
EnsureFunctionExists(M, "longjmp", I->arg_begin(), I->arg_end(),
Type::getVoidTy(M.getContext()));
break;
case Intrinsic::siglongjmp:
EnsureFunctionExists(M, "abort", I->arg_end(), I->arg_end(),
Type::getVoidTy(M.getContext()));
break;
case Intrinsic::memcpy:
M.getOrInsertFunction("memcpy",
Type::getInt8PtrTy(Context),
Type::getInt8PtrTy(Context),
Type::getInt8PtrTy(Context),
TD.getIntPtrType(Context), (Type *)0);
break;
case Intrinsic::memmove:
M.getOrInsertFunction("memmove",
Type::getInt8PtrTy(Context),
Type::getInt8PtrTy(Context),
Type::getInt8PtrTy(Context),
TD.getIntPtrType(Context), (Type *)0);
break;
case Intrinsic::memset:
M.getOrInsertFunction("memset",
Type::getInt8PtrTy(Context),
Type::getInt8PtrTy(Context),
Type::getInt32Ty(M.getContext()),
TD.getIntPtrType(Context), (Type *)0);
break;
case Intrinsic::sqrt:
EnsureFPIntrinsicsExist(M, I, "sqrtf", "sqrt", "sqrtl");
break;
case Intrinsic::sin:
EnsureFPIntrinsicsExist(M, I, "sinf", "sin", "sinl");
break;
case Intrinsic::cos:
EnsureFPIntrinsicsExist(M, I, "cosf", "cos", "cosl");
break;
case Intrinsic::pow:
EnsureFPIntrinsicsExist(M, I, "powf", "pow", "powl");
break;
case Intrinsic::log:
EnsureFPIntrinsicsExist(M, I, "logf", "log", "logl");
break;
case Intrinsic::log2:
EnsureFPIntrinsicsExist(M, I, "log2f", "log2", "log2l");
break;
case Intrinsic::log10:
EnsureFPIntrinsicsExist(M, I, "log10f", "log10", "log10l");
break;
case Intrinsic::exp:
EnsureFPIntrinsicsExist(M, I, "expf", "exp", "expl");
break;
case Intrinsic::exp2:
EnsureFPIntrinsicsExist(M, I, "exp2f", "exp2", "exp2l");
break;
}
}
/// LowerBSWAP - Emit the code to lower bswap of V before the specified
/// instruction IP.
static Value *LowerBSWAP(LLVMContext &Context, Value *V, Instruction *IP) {
assert(V->getType()->isIntegerTy() && "Can't bswap a non-integer type!");
unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
IRBuilder<> Builder(IP->getParent(), IP);
switch(BitSize) {
default: llvm_unreachable("Unhandled type size of value to byteswap!");
case 16: {
Value *Tmp1 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 8),
"bswap.2");
Value *Tmp2 = Builder.CreateLShr(V, ConstantInt::get(V->getType(), 8),
"bswap.1");
V = Builder.CreateOr(Tmp1, Tmp2, "bswap.i16");
break;
}
case 32: {
Value *Tmp4 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 24),
"bswap.4");
Value *Tmp3 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 8),
"bswap.3");
Value *Tmp2 = Builder.CreateLShr(V, ConstantInt::get(V->getType(), 8),
"bswap.2");
Value *Tmp1 = Builder.CreateLShr(V,ConstantInt::get(V->getType(), 24),
"bswap.1");
Tmp3 = Builder.CreateAnd(Tmp3,
ConstantInt::get(Type::getInt32Ty(Context), 0xFF0000),
"bswap.and3");
Tmp2 = Builder.CreateAnd(Tmp2,
ConstantInt::get(Type::getInt32Ty(Context), 0xFF00),
"bswap.and2");
Tmp4 = Builder.CreateOr(Tmp4, Tmp3, "bswap.or1");
Tmp2 = Builder.CreateOr(Tmp2, Tmp1, "bswap.or2");
V = Builder.CreateOr(Tmp4, Tmp2, "bswap.i32");
break;
}
case 64: {
Value *Tmp8 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 56),
"bswap.8");
Value *Tmp7 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 40),
"bswap.7");
Value *Tmp6 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 24),
"bswap.6");
Value *Tmp5 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 8),
"bswap.5");
Value* Tmp4 = Builder.CreateLShr(V, ConstantInt::get(V->getType(), 8),
"bswap.4");
Value* Tmp3 = Builder.CreateLShr(V,
ConstantInt::get(V->getType(), 24),
"bswap.3");
Value* Tmp2 = Builder.CreateLShr(V,
ConstantInt::get(V->getType(), 40),
"bswap.2");
Value* Tmp1 = Builder.CreateLShr(V,
ConstantInt::get(V->getType(), 56),
"bswap.1");
Tmp7 = Builder.CreateAnd(Tmp7,
ConstantInt::get(Type::getInt64Ty(Context),
0xFF000000000000ULL),
"bswap.and7");
Tmp6 = Builder.CreateAnd(Tmp6,
ConstantInt::get(Type::getInt64Ty(Context),
0xFF0000000000ULL),
"bswap.and6");
Tmp5 = Builder.CreateAnd(Tmp5,
ConstantInt::get(Type::getInt64Ty(Context),
0xFF00000000ULL),
"bswap.and5");
Tmp4 = Builder.CreateAnd(Tmp4,
ConstantInt::get(Type::getInt64Ty(Context),
0xFF000000ULL),
"bswap.and4");
Tmp3 = Builder.CreateAnd(Tmp3,
ConstantInt::get(Type::getInt64Ty(Context),
0xFF0000ULL),
"bswap.and3");
Tmp2 = Builder.CreateAnd(Tmp2,
ConstantInt::get(Type::getInt64Ty(Context),
0xFF00ULL),
"bswap.and2");
Tmp8 = Builder.CreateOr(Tmp8, Tmp7, "bswap.or1");
Tmp6 = Builder.CreateOr(Tmp6, Tmp5, "bswap.or2");
Tmp4 = Builder.CreateOr(Tmp4, Tmp3, "bswap.or3");
Tmp2 = Builder.CreateOr(Tmp2, Tmp1, "bswap.or4");
Tmp8 = Builder.CreateOr(Tmp8, Tmp6, "bswap.or5");
Tmp4 = Builder.CreateOr(Tmp4, Tmp2, "bswap.or6");
V = Builder.CreateOr(Tmp8, Tmp4, "bswap.i64");
break;
}
}
return V;
}
/// LowerCTPOP - Emit the code to lower ctpop of V before the specified
/// instruction IP.
static Value *LowerCTPOP(LLVMContext &Context, Value *V, Instruction *IP) {
assert(V->getType()->isIntegerTy() && "Can't ctpop a non-integer type!");
static const uint64_t MaskValues[6] = {
0x5555555555555555ULL, 0x3333333333333333ULL,
0x0F0F0F0F0F0F0F0FULL, 0x00FF00FF00FF00FFULL,
0x0000FFFF0000FFFFULL, 0x00000000FFFFFFFFULL
};
IRBuilder<> Builder(IP->getParent(), IP);
unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
unsigned WordSize = (BitSize + 63) / 64;
Value *Count = ConstantInt::get(V->getType(), 0);
for (unsigned n = 0; n < WordSize; ++n) {
Value *PartValue = V;
for (unsigned i = 1, ct = 0; i < (BitSize>64 ? 64 : BitSize);
i <<= 1, ++ct) {
Value *MaskCst = ConstantInt::get(V->getType(), MaskValues[ct]);
Value *LHS = Builder.CreateAnd(PartValue, MaskCst, "cppop.and1");
Value *VShift = Builder.CreateLShr(PartValue,
ConstantInt::get(V->getType(), i),
"ctpop.sh");
Value *RHS = Builder.CreateAnd(VShift, MaskCst, "cppop.and2");
PartValue = Builder.CreateAdd(LHS, RHS, "ctpop.step");
}
Count = Builder.CreateAdd(PartValue, Count, "ctpop.part");
if (BitSize > 64) {
V = Builder.CreateLShr(V, ConstantInt::get(V->getType(), 64),
"ctpop.part.sh");
BitSize -= 64;
}
}
return Count;
}
/// LowerCTLZ - Emit the code to lower ctlz of V before the specified
/// instruction IP.
static Value *LowerCTLZ(LLVMContext &Context, Value *V, Instruction *IP) {
IRBuilder<> Builder(IP->getParent(), IP);
unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
for (unsigned i = 1; i < BitSize; i <<= 1) {
Value *ShVal = ConstantInt::get(V->getType(), i);
ShVal = Builder.CreateLShr(V, ShVal, "ctlz.sh");
V = Builder.CreateOr(V, ShVal, "ctlz.step");
}
V = Builder.CreateNot(V);
return LowerCTPOP(Context, V, IP);
}
static void ReplaceFPIntrinsicWithCall(CallInst *CI, const char *Fname,
const char *Dname,
const char *LDname) {
CallSite CS(CI);
switch (CI->getArgOperand(0)->getType()->getTypeID()) {
default: llvm_unreachable("Invalid type in intrinsic");
case Type::FloatTyID:
ReplaceCallWith(Fname, CI, CS.arg_begin(), CS.arg_end(),
Type::getFloatTy(CI->getContext()));
break;
case Type::DoubleTyID:
ReplaceCallWith(Dname, CI, CS.arg_begin(), CS.arg_end(),
Type::getDoubleTy(CI->getContext()));
break;
case Type::X86_FP80TyID:
case Type::FP128TyID:
case Type::PPC_FP128TyID:
ReplaceCallWith(LDname, CI, CS.arg_begin(), CS.arg_end(),
CI->getArgOperand(0)->getType());
break;
}
}
void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
IRBuilder<> Builder(CI->getParent(), CI);
LLVMContext &Context = CI->getContext();
const Function *Callee = CI->getCalledFunction();
assert(Callee && "Cannot lower an indirect call!");
CallSite CS(CI);
switch (Callee->getIntrinsicID()) {
case Intrinsic::not_intrinsic:
report_fatal_error("Cannot lower a call to a non-intrinsic function '"+
Callee->getName() + "'!");
default:
report_fatal_error("Code generator does not support intrinsic function '"+
Callee->getName()+"'!");
case Intrinsic::expect: {
// Just replace __builtin_expect(exp, c) with EXP.
Value *V = CI->getArgOperand(0);
CI->replaceAllUsesWith(V);
break;
}
// The setjmp/longjmp intrinsics should only exist in the code if it was
// never optimized (ie, right out of the CFE), or if it has been hacked on
// by the lowerinvoke pass. In both cases, the right thing to do is to
// convert the call to an explicit setjmp or longjmp call.
case Intrinsic::setjmp: {
Value *V = ReplaceCallWith("setjmp", CI, CS.arg_begin(), CS.arg_end(),
Type::getInt32Ty(Context));
if (!CI->getType()->isVoidTy())
CI->replaceAllUsesWith(V);
break;
}
case Intrinsic::sigsetjmp:
if (!CI->getType()->isVoidTy())
CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
break;
case Intrinsic::longjmp: {
ReplaceCallWith("longjmp", CI, CS.arg_begin(), CS.arg_end(),
Type::getVoidTy(Context));
break;
}
case Intrinsic::siglongjmp: {
// Insert the call to abort
ReplaceCallWith("abort", CI, CS.arg_end(), CS.arg_end(),
Type::getVoidTy(Context));
break;
}
case Intrinsic::ctpop:
CI->replaceAllUsesWith(LowerCTPOP(Context, CI->getArgOperand(0), CI));
break;
case Intrinsic::bswap:
CI->replaceAllUsesWith(LowerBSWAP(Context, CI->getArgOperand(0), CI));
break;
case Intrinsic::ctlz:
CI->replaceAllUsesWith(LowerCTLZ(Context, CI->getArgOperand(0), CI));
break;
case Intrinsic::cttz: {
// cttz(x) -> ctpop(~X & (X-1))
Value *Src = CI->getArgOperand(0);
Value *NotSrc = Builder.CreateNot(Src);
NotSrc->setName(Src->getName() + ".not");
Value *SrcM1 = ConstantInt::get(Src->getType(), 1);
SrcM1 = Builder.CreateSub(Src, SrcM1);
Src = LowerCTPOP(Context, Builder.CreateAnd(NotSrc, SrcM1), CI);
CI->replaceAllUsesWith(Src);
break;
}
case Intrinsic::stacksave:
case Intrinsic::stackrestore: {
if (!Warned)
errs() << "WARNING: this target does not support the llvm.stack"
<< (Callee->getIntrinsicID() == Intrinsic::stacksave ?
"save" : "restore") << " intrinsic.\n";
Warned = true;
if (Callee->getIntrinsicID() == Intrinsic::stacksave)
CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
break;
}
case Intrinsic::returnaddress:
case Intrinsic::frameaddress:
errs() << "WARNING: this target does not support the llvm."
<< (Callee->getIntrinsicID() == Intrinsic::returnaddress ?
"return" : "frame") << "address intrinsic.\n";
CI->replaceAllUsesWith(ConstantPointerNull::get(
cast<PointerType>(CI->getType())));
break;
case Intrinsic::prefetch:
break; // Simply strip out prefetches on unsupported architectures
case Intrinsic::pcmarker:
break; // Simply strip out pcmarker on unsupported architectures
case Intrinsic::readcyclecounter: {
errs() << "WARNING: this target does not support the llvm.readcyclecoun"
<< "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: {
IntegerType *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: {
IntegerType *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: {
IntegerType *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;
}
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