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llvm-6502/lib/CodeGen/IntrinsicLowering.cpp
Reid Spencer 8a903db499 Convert the last uses of CastInst::createInferredCast to a normal cast 
creation. These changes are still temporary but at least this pushes
knowledge of signedness out closer to where it can be determined properly
and allows signedness to be removed from VMCore.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32654 91177308-0d34-0410-b5e6-96231b3b80d8
2006-12-18 08:47:13 +00:00

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//===-- IntrinsicLowering.cpp - Intrinsic Lowering default implementation -===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the IntrinsicLowering class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Instructions.h"
#include "llvm/Type.h"
#include "llvm/CodeGen/IntrinsicLowering.h"
#include "llvm/Support/Streams.h"
using namespace llvm;
template <class ArgIt>
static Function *EnsureFunctionExists(Module &M, const char *Name,
ArgIt ArgBegin, ArgIt ArgEnd,
const Type *RetTy) {
if (Function *F = M.getNamedFunction(Name)) return F;
// It doesn't already exist in the program, insert a new definition now.
std::vector<const Type *> ParamTys;
for (ArgIt I = ArgBegin; I != ArgEnd; ++I)
ParamTys.push_back(I->getType());
return M.getOrInsertFunction(Name, FunctionType::get(RetTy, ParamTys, false));
}
/// 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,
const unsigned *castOpcodes,
const Type *RetTy, Function *&FCache) {
if (!FCache) {
// 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();
FCache = M->getNamedFunction(NewFn);
if (!FCache) {
// It doesn't already exist in the program, insert a new definition now.
std::vector<const Type *> ParamTys;
for (ArgIt I = ArgBegin; I != ArgEnd; ++I)
ParamTys.push_back((*I)->getType());
FCache = M->getOrInsertFunction(NewFn,
FunctionType::get(RetTy, ParamTys, false));
}
}
const FunctionType *FT = FCache->getFunctionType();
std::vector<Value*> Operands;
unsigned ArgNo = 0;
for (ArgIt I = ArgBegin; I != ArgEnd && ArgNo != FT->getNumParams();
++I, ++ArgNo) {
Value *Arg = *I;
if (Arg->getType() != FT->getParamType(ArgNo))
if (castOpcodes[ArgNo])
Arg = CastInst::create(Instruction::CastOps(castOpcodes[ArgNo]),
Arg, FT->getParamType(ArgNo), Arg->getName(), CI);
else {
Instruction::CastOps opcode = CastInst::getCastOpcode(Arg,
Arg->getType()->isSigned(), FT->getParamType(ArgNo),
FT->getParamType(ArgNo)->isSigned());
Arg = CastInst::create(opcode, Arg, FT->getParamType(ArgNo),
Arg->getName(), CI);
}
Operands.push_back(Arg);
}
// Pass nulls into any additional arguments...
for (; ArgNo != FT->getNumParams(); ++ArgNo)
Operands.push_back(Constant::getNullValue(FT->getParamType(ArgNo)));
std::string Name = CI->getName(); CI->setName("");
if (FT->getReturnType() == Type::VoidTy) Name.clear();
CallInst *NewCI = new CallInst(FCache, Operands, Name, CI);
if (!CI->use_empty()) {
Value *V = NewCI;
if (CI->getType() != NewCI->getType()) {
Instruction::CastOps opcode = CastInst::getCastOpcode(NewCI,
NewCI->getType()->isSigned(), CI->getType(),
CI->getType()->isSigned());
V = CastInst::create(opcode, NewCI, CI->getType(), Name, CI);
}
CI->replaceAllUsesWith(V);
}
return NewCI;
}
void IntrinsicLowering::AddPrototypes(Module &M) {
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
if (I->isExternal() && !I->use_empty())
switch (I->getIntrinsicID()) {
default: break;
case Intrinsic::setjmp:
EnsureFunctionExists(M, "setjmp", I->arg_begin(), I->arg_end(),
Type::IntTy);
break;
case Intrinsic::longjmp:
EnsureFunctionExists(M, "longjmp", I->arg_begin(), I->arg_end(),
Type::VoidTy);
break;
case Intrinsic::siglongjmp:
EnsureFunctionExists(M, "abort", I->arg_end(), I->arg_end(),
Type::VoidTy);
break;
case Intrinsic::memcpy_i32:
case Intrinsic::memcpy_i64:
EnsureFunctionExists(M, "memcpy", I->arg_begin(), --I->arg_end(),
I->arg_begin()->getType());
break;
case Intrinsic::memmove_i32:
case Intrinsic::memmove_i64:
EnsureFunctionExists(M, "memmove", I->arg_begin(), --I->arg_end(),
I->arg_begin()->getType());
break;
case Intrinsic::memset_i32:
case Intrinsic::memset_i64:
M.getOrInsertFunction("memset", PointerType::get(Type::SByteTy),
PointerType::get(Type::SByteTy),
Type::IntTy, (--(--I->arg_end()))->getType(),
(Type *)0);
break;
case Intrinsic::isunordered_f32:
case Intrinsic::isunordered_f64:
EnsureFunctionExists(M, "isunordered", I->arg_begin(), I->arg_end(),
Type::BoolTy);
break;
case Intrinsic::sqrt_f32:
case Intrinsic::sqrt_f64:
if(I->arg_begin()->getType() == Type::FloatTy)
EnsureFunctionExists(M, "sqrtf", I->arg_begin(), I->arg_end(),
Type::FloatTy);
else
EnsureFunctionExists(M, "sqrt", I->arg_begin(), I->arg_end(),
Type::DoubleTy);
break;
}
}
/// LowerBSWAP - Emit the code to lower bswap of V before the specified
/// instruction IP.
static Value *LowerBSWAP(Value *V, Instruction *IP) {
assert(V->getType()->isInteger() && "Can't bswap a non-integer type!");
unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
switch(BitSize) {
default: assert(0 && "Unhandled type size of value to byteswap!");
case 16: {
Value *Tmp1 = new ShiftInst(Instruction::Shl, V,
ConstantInt::get(Type::UByteTy,8),"bswap.2",IP);
Value *Tmp2 = new ShiftInst(Instruction::LShr, V,
ConstantInt::get(Type::UByteTy,8),"bswap.1",IP);
V = BinaryOperator::createOr(Tmp1, Tmp2, "bswap.i16", IP);
break;
}
case 32: {
Value *Tmp4 = new ShiftInst(Instruction::Shl, V,
ConstantInt::get(Type::UByteTy,24),"bswap.4", IP);
Value *Tmp3 = new ShiftInst(Instruction::Shl, V,
ConstantInt::get(Type::UByteTy,8),"bswap.3",IP);
Value *Tmp2 = new ShiftInst(Instruction::LShr, V,
ConstantInt::get(Type::UByteTy,8),"bswap.2",IP);
Value *Tmp1 = new ShiftInst(Instruction::LShr, V,
ConstantInt::get(Type::UByteTy,24),"bswap.1", IP);
Tmp3 = BinaryOperator::createAnd(Tmp3,
ConstantInt::get(Type::UIntTy, 0xFF0000),
"bswap.and3", IP);
Tmp2 = BinaryOperator::createAnd(Tmp2,
ConstantInt::get(Type::UIntTy, 0xFF00),
"bswap.and2", IP);
Tmp4 = BinaryOperator::createOr(Tmp4, Tmp3, "bswap.or1", IP);
Tmp2 = BinaryOperator::createOr(Tmp2, Tmp1, "bswap.or2", IP);
V = BinaryOperator::createOr(Tmp4, Tmp3, "bswap.i32", IP);
break;
}
case 64: {
Value *Tmp8 = new ShiftInst(Instruction::Shl, V,
ConstantInt::get(Type::UByteTy,56),"bswap.8", IP);
Value *Tmp7 = new ShiftInst(Instruction::Shl, V,
ConstantInt::get(Type::UByteTy,40),"bswap.7", IP);
Value *Tmp6 = new ShiftInst(Instruction::Shl, V,
ConstantInt::get(Type::UByteTy,24),"bswap.6", IP);
Value *Tmp5 = new ShiftInst(Instruction::Shl, V,
ConstantInt::get(Type::UByteTy,8),"bswap.5", IP);
Value* Tmp4 = new ShiftInst(Instruction::LShr, V,
ConstantInt::get(Type::UByteTy,8),"bswap.4", IP);
Value* Tmp3 = new ShiftInst(Instruction::LShr, V,
ConstantInt::get(Type::UByteTy,24),"bswap.3", IP);
Value* Tmp2 = new ShiftInst(Instruction::LShr, V,
ConstantInt::get(Type::UByteTy,40),"bswap.2", IP);
Value* Tmp1 = new ShiftInst(Instruction::LShr, V,
ConstantInt::get(Type::UByteTy,56),"bswap.1", IP);
Tmp7 = BinaryOperator::createAnd(Tmp7,
ConstantInt::get(Type::ULongTy,
0xFF000000000000ULL),
"bswap.and7", IP);
Tmp6 = BinaryOperator::createAnd(Tmp6,
ConstantInt::get(Type::ULongTy, 0xFF0000000000ULL),
"bswap.and6", IP);
Tmp5 = BinaryOperator::createAnd(Tmp5,
ConstantInt::get(Type::ULongTy, 0xFF00000000ULL),
"bswap.and5", IP);
Tmp4 = BinaryOperator::createAnd(Tmp4,
ConstantInt::get(Type::ULongTy, 0xFF000000ULL),
"bswap.and4", IP);
Tmp3 = BinaryOperator::createAnd(Tmp3,
ConstantInt::get(Type::ULongTy, 0xFF0000ULL),
"bswap.and3", IP);
Tmp2 = BinaryOperator::createAnd(Tmp2,
ConstantInt::get(Type::ULongTy, 0xFF00ULL),
"bswap.and2", IP);
Tmp8 = BinaryOperator::createOr(Tmp8, Tmp7, "bswap.or1", IP);
Tmp6 = BinaryOperator::createOr(Tmp6, Tmp5, "bswap.or2", IP);
Tmp4 = BinaryOperator::createOr(Tmp4, Tmp3, "bswap.or3", IP);
Tmp2 = BinaryOperator::createOr(Tmp2, Tmp1, "bswap.or4", IP);
Tmp8 = BinaryOperator::createOr(Tmp8, Tmp6, "bswap.or5", IP);
Tmp4 = BinaryOperator::createOr(Tmp4, Tmp2, "bswap.or6", IP);
V = BinaryOperator::createOr(Tmp8, Tmp4, "bswap.i64", IP);
break;
}
}
return V;
}
/// LowerCTPOP - Emit the code to lower ctpop of V before the specified
/// instruction IP.
static Value *LowerCTPOP(Value *V, Instruction *IP) {
assert(V->getType()->isInteger() && "Can't ctpop a non-integer type!");
static const uint64_t MaskValues[6] = {
0x5555555555555555ULL, 0x3333333333333333ULL,
0x0F0F0F0F0F0F0F0FULL, 0x00FF00FF00FF00FFULL,
0x0000FFFF0000FFFFULL, 0x00000000FFFFFFFFULL
};
unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
for (unsigned i = 1, ct = 0; i != BitSize; i <<= 1, ++ct) {
Value *MaskCst = ConstantInt::get(V->getType(), MaskValues[ct]);
Value *LHS = BinaryOperator::createAnd(V, MaskCst, "cppop.and1", IP);
Value *VShift = new ShiftInst(Instruction::LShr, V,
ConstantInt::get(Type::UByteTy, i), "ctpop.sh", IP);
Value *RHS = BinaryOperator::createAnd(VShift, MaskCst, "cppop.and2", IP);
V = BinaryOperator::createAdd(LHS, RHS, "ctpop.step", IP);
}
return V;
}
/// LowerCTLZ - Emit the code to lower ctlz of V before the specified
/// instruction IP.
static Value *LowerCTLZ(Value *V, Instruction *IP) {
unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
for (unsigned i = 1; i != BitSize; i <<= 1) {
Value *ShVal = ConstantInt::get(Type::UByteTy, i);
ShVal = new ShiftInst(Instruction::LShr, V, ShVal, "ctlz.sh", IP);
V = BinaryOperator::createOr(V, ShVal, "ctlz.step", IP);
}
V = BinaryOperator::createNot(V, "", IP);
return LowerCTPOP(V, IP);
}
void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
Function *Callee = CI->getCalledFunction();
assert(Callee && "Cannot lower an indirect call!");
switch (Callee->getIntrinsicID()) {
case Intrinsic::not_intrinsic:
cerr << "Cannot lower a call to a non-intrinsic function '"
<< Callee->getName() << "'!\n";
abort();
default:
cerr << "Error: Code generator does not support intrinsic function '"
<< Callee->getName() << "'!\n";
abort();
// 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: {
static Function *SetjmpFCache = 0;
static const unsigned castOpcodes[] = { Instruction::BitCast };
Value *V = ReplaceCallWith("setjmp", CI, CI->op_begin()+1, CI->op_end(),
castOpcodes, Type::IntTy, SetjmpFCache);
if (CI->getType() != Type::VoidTy)
CI->replaceAllUsesWith(V);
break;
}
case Intrinsic::sigsetjmp:
if (CI->getType() != Type::VoidTy)
CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
break;
case Intrinsic::longjmp: {
static Function *LongjmpFCache = 0;
static const unsigned castOpcodes[] =
{ Instruction::BitCast, 0 };
ReplaceCallWith("longjmp", CI, CI->op_begin()+1, CI->op_end(),
castOpcodes, Type::VoidTy, LongjmpFCache);
break;
}
case Intrinsic::siglongjmp: {
// Insert the call to abort
static Function *AbortFCache = 0;
static const unsigned castOpcodes[] =
{ Instruction::BitCast, 0 };
ReplaceCallWith("abort", CI, CI->op_end(), CI->op_end(),
castOpcodes, Type::VoidTy, AbortFCache);
break;
}
case Intrinsic::ctpop_i8:
case Intrinsic::ctpop_i16:
case Intrinsic::ctpop_i32:
case Intrinsic::ctpop_i64:
CI->replaceAllUsesWith(LowerCTPOP(CI->getOperand(1), CI));
break;
case Intrinsic::bswap_i16:
case Intrinsic::bswap_i32:
case Intrinsic::bswap_i64:
CI->replaceAllUsesWith(LowerBSWAP(CI->getOperand(1), CI));
break;
case Intrinsic::ctlz_i8:
case Intrinsic::ctlz_i16:
case Intrinsic::ctlz_i32:
case Intrinsic::ctlz_i64:
CI->replaceAllUsesWith(LowerCTLZ(CI->getOperand(1), CI));
break;
case Intrinsic::cttz_i8:
case Intrinsic::cttz_i16:
case Intrinsic::cttz_i32:
case Intrinsic::cttz_i64: {
// cttz(x) -> ctpop(~X & (X-1))
Value *Src = CI->getOperand(1);
Value *NotSrc = BinaryOperator::createNot(Src, Src->getName()+".not", CI);
Value *SrcM1 = ConstantInt::get(Src->getType(), 1);
SrcM1 = BinaryOperator::createSub(Src, SrcM1, "", CI);
Src = LowerCTPOP(BinaryOperator::createAnd(NotSrc, SrcM1, "", CI), CI);
CI->replaceAllUsesWith(Src);
break;
}
case Intrinsic::stacksave:
case Intrinsic::stackrestore: {
static bool Warned = false;
if (!Warned)
cerr << "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:
cerr << "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: {
cerr << "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::ULongTy, 0));
break;
}
case Intrinsic::dbg_stoppoint:
case Intrinsic::dbg_region_start:
case Intrinsic::dbg_region_end:
case Intrinsic::dbg_func_start:
case Intrinsic::dbg_declare:
break; // Simply strip out debugging intrinsics
case Intrinsic::memcpy_i32: {
// The memcpy intrinsic take an extra alignment argument that the memcpy
// libc function does not.
static unsigned opcodes[] =
{ Instruction::BitCast, Instruction::BitCast, Instruction::BitCast };
// FIXME:
// if (target_is_64_bit) opcodes[2] = Instruction::ZExt;
// else opcodes[2] = Instruction::BitCast;
static Function *MemcpyFCache = 0;
ReplaceCallWith("memcpy", CI, CI->op_begin()+1, CI->op_end()-1,
opcodes, (*(CI->op_begin()+1))->getType(), MemcpyFCache);
break;
}
case Intrinsic::memcpy_i64: {
static unsigned opcodes[] =
{ Instruction::BitCast, Instruction::BitCast, Instruction::Trunc };
// FIXME:
// if (target_is_64_bit) opcodes[2] = Instruction::BitCast;
// else opcodes[2] = Instruction::Trunc;
static Function *MemcpyFCache = 0;
ReplaceCallWith("memcpy", CI, CI->op_begin()+1, CI->op_end()-1,
opcodes, (*(CI->op_begin()+1))->getType(), MemcpyFCache);
break;
}
case Intrinsic::memmove_i32: {
// The memmove intrinsic take an extra alignment argument that the memmove
// libc function does not.
static unsigned opcodes[] =
{ Instruction::BitCast, Instruction::BitCast, Instruction::BitCast };
// FIXME:
// if (target_is_64_bit) opcodes[2] = Instruction::ZExt;
// else opcodes[2] = Instruction::BitCast;
static Function *MemmoveFCache = 0;
ReplaceCallWith("memmove", CI, CI->op_begin()+1, CI->op_end()-1,
opcodes, (*(CI->op_begin()+1))->getType(), MemmoveFCache);
break;
}
case Intrinsic::memmove_i64: {
// The memmove intrinsic take an extra alignment argument that the memmove
// libc function does not.
static const unsigned opcodes[] =
{ Instruction::BitCast, Instruction::BitCast, Instruction::Trunc };
// if (target_is_64_bit) opcodes[2] = Instruction::BitCast;
// else opcodes[2] = Instruction::Trunc;
static Function *MemmoveFCache = 0;
ReplaceCallWith("memmove", CI, CI->op_begin()+1, CI->op_end()-1,
opcodes, (*(CI->op_begin()+1))->getType(), MemmoveFCache);
break;
}
case Intrinsic::memset_i32: {
// The memset intrinsic take an extra alignment argument that the memset
// libc function does not.
static const unsigned opcodes[] =
{ Instruction::BitCast, Instruction::ZExt, Instruction::ZExt, 0 };
// if (target_is_64_bit) opcodes[2] = Instruction::BitCast;
// else opcodes[2] = Instruction::ZExt;
static Function *MemsetFCache = 0;
ReplaceCallWith("memset", CI, CI->op_begin()+1, CI->op_end()-1,
opcodes, (*(CI->op_begin()+1))->getType(), MemsetFCache);
}
case Intrinsic::memset_i64: {
// The memset intrinsic take an extra alignment argument that the memset
// libc function does not.
static const unsigned opcodes[] =
{ Instruction::BitCast, Instruction::ZExt, Instruction::Trunc, 0 };
// if (target_is_64_bit) opcodes[2] = Instruction::BitCast;
// else opcodes[2] = Instruction::Trunc;
static Function *MemsetFCache = 0;
ReplaceCallWith("memset", CI, CI->op_begin()+1, CI->op_end()-1,
opcodes, (*(CI->op_begin()+1))->getType(), MemsetFCache);
break;
}
case Intrinsic::isunordered_f32:
case Intrinsic::isunordered_f64: {
Value *L = CI->getOperand(1);
Value *R = CI->getOperand(2);
Value *LIsNan = new SetCondInst(Instruction::SetNE, L, L, "LIsNan", CI);
Value *RIsNan = new SetCondInst(Instruction::SetNE, R, R, "RIsNan", CI);
CI->replaceAllUsesWith(
BinaryOperator::create(Instruction::Or, LIsNan, RIsNan,
"isunordered", CI));
break;
}
case Intrinsic::sqrt_f32: {
static const unsigned opcodes[] = { 0 };
static Function *sqrtfFCache = 0;
ReplaceCallWith("sqrtf", CI, CI->op_begin()+1, CI->op_end(),
opcodes, Type::FloatTy, sqrtfFCache);
break;
}
case Intrinsic::sqrt_f64: {
static const unsigned opcodes[] = { 0 };
static Function *sqrtFCache = 0;
ReplaceCallWith("sqrt", CI, CI->op_begin()+1, CI->op_end(),
opcodes, Type::DoubleTy, sqrtFCache);
break;
}
}
assert(CI->use_empty() &&
"Lowering should have eliminated any uses of the intrinsic call!");
CI->eraseFromParent();
}
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