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Switch to using IRBuilder throughout.

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llvm-svn: 71587
This commit is contained in:
Jay Foad 2009-05-12 20:27:44 +00:00
parent 7f78e63cf3
commit a4531bdfe8
1 changed files with 195 additions and 204 deletions
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399
lib/CodeGen/IntrinsicLowering.cpp
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@ -14,35 +14,13 @@
#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"
#include "llvm/Support/IRBuilder.h"
#include "llvm/Target/TargetData.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/STLExtras.h"
using namespace llvm;
// Return the integer value Val zero-extended or truncated (if necessary) to
// type ITy. Any new instructions are inserted at InsertBefore.
template<typename InsertType>
static Value *getZExtOrTrunc(Value *Val, const IntegerType *ITy,
InsertType InsertPoint) {
const IntegerType *ValTy = cast<IntegerType>(Val->getType());
if (ValTy == ITy)
return Val;
Constant *CVal = dyn_cast<Constant>(Val);
if (ValTy->getBitWidth() < ITy->getBitWidth()) {
if (CVal)
return ConstantExpr::getZExt(CVal, ITy);
return new ZExtInst(Val, ITy, "", InsertPoint);
} else {
if (CVal)
return ConstantExpr::getTrunc(CVal, ITy);
return new TruncInst(Val, ITy, "", InsertPoint);
}
}
template <class ArgIt>
static void EnsureFunctionExists(Module &M, const char *Name,
ArgIt ArgBegin, ArgIt ArgEnd,
@ -96,9 +74,10 @@ static CallInst *ReplaceCallWith(const char *NewFn, CallInst *CI,
FunctionType::get(RetTy, ParamTys, false));
}
IRBuilder<> Builder(CI->getParent(), CI);
SmallVector<Value *, 8> Args(ArgBegin, ArgEnd);
CallInst *NewCI = CallInst::Create(FCache, Args.begin(), Args.end(),
CI->getName(), CI);
CallInst *NewCI = Builder.CreateCall(FCache, Args.begin(), Args.end());
NewCI->setName(CI->getName());
if (!CI->use_empty())
CI->replaceAllUsesWith(NewCI);
return NewCI;
@ -176,79 +155,80 @@ static Value *LowerBSWAP(Value *V, Instruction *IP) {
unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
IRBuilder<> Builder(IP->getParent(), IP);
switch(BitSize) {
default: assert(0 && "Unhandled type size of value to byteswap!");
case 16: {
Value *Tmp1 = BinaryOperator::CreateShl(V,
ConstantInt::get(V->getType(),8),"bswap.2",IP);
Value *Tmp2 = BinaryOperator::CreateLShr(V,
ConstantInt::get(V->getType(),8),"bswap.1",IP);
V = BinaryOperator::CreateOr(Tmp1, Tmp2, "bswap.i16", IP);
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 = BinaryOperator::CreateShl(V,
ConstantInt::get(V->getType(),24),"bswap.4", IP);
Value *Tmp3 = BinaryOperator::CreateShl(V,
ConstantInt::get(V->getType(),8),"bswap.3",IP);
Value *Tmp2 = BinaryOperator::CreateLShr(V,
ConstantInt::get(V->getType(),8),"bswap.2",IP);
Value *Tmp1 = BinaryOperator::CreateLShr(V,
ConstantInt::get(V->getType(),24),"bswap.1", IP);
Tmp3 = BinaryOperator::CreateAnd(Tmp3,
ConstantInt::get(Type::Int32Ty, 0xFF0000),
"bswap.and3", IP);
Tmp2 = BinaryOperator::CreateAnd(Tmp2,
ConstantInt::get(Type::Int32Ty, 0xFF00),
"bswap.and2", IP);
Tmp4 = BinaryOperator::CreateOr(Tmp4, Tmp3, "bswap.or1", IP);
Tmp2 = BinaryOperator::CreateOr(Tmp2, Tmp1, "bswap.or2", IP);
V = BinaryOperator::CreateOr(Tmp4, Tmp2, "bswap.i32", IP);
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::Int32Ty, 0xFF0000),
"bswap.and3");
Tmp2 = Builder.CreateAnd(Tmp2, ConstantInt::get(Type::Int32Ty, 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 = BinaryOperator::CreateShl(V,
ConstantInt::get(V->getType(),56),"bswap.8", IP);
Value *Tmp7 = BinaryOperator::CreateShl(V,
ConstantInt::get(V->getType(),40),"bswap.7", IP);
Value *Tmp6 = BinaryOperator::CreateShl(V,
ConstantInt::get(V->getType(),24),"bswap.6", IP);
Value *Tmp5 = BinaryOperator::CreateShl(V,
ConstantInt::get(V->getType(),8),"bswap.5", IP);
Value* Tmp4 = BinaryOperator::CreateLShr(V,
ConstantInt::get(V->getType(),8),"bswap.4", IP);
Value* Tmp3 = BinaryOperator::CreateLShr(V,
ConstantInt::get(V->getType(),24),"bswap.3", IP);
Value* Tmp2 = BinaryOperator::CreateLShr(V,
ConstantInt::get(V->getType(),40),"bswap.2", IP);
Value* Tmp1 = BinaryOperator::CreateLShr(V,
ConstantInt::get(V->getType(),56),"bswap.1", IP);
Tmp7 = BinaryOperator::CreateAnd(Tmp7,
ConstantInt::get(Type::Int64Ty,
0xFF000000000000ULL),
"bswap.and7", IP);
Tmp6 = BinaryOperator::CreateAnd(Tmp6,
ConstantInt::get(Type::Int64Ty, 0xFF0000000000ULL),
"bswap.and6", IP);
Tmp5 = BinaryOperator::CreateAnd(Tmp5,
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::Int64Ty,
0xFF000000000000ULL),
"bswap.and7");
Tmp6 = Builder.CreateAnd(Tmp6,
ConstantInt::get(Type::Int64Ty,
0xFF0000000000ULL),
"bswap.and6");
Tmp5 = Builder.CreateAnd(Tmp5,
ConstantInt::get(Type::Int64Ty, 0xFF00000000ULL),
"bswap.and5", IP);
Tmp4 = BinaryOperator::CreateAnd(Tmp4,
"bswap.and5");
Tmp4 = Builder.CreateAnd(Tmp4,
ConstantInt::get(Type::Int64Ty, 0xFF000000ULL),
"bswap.and4", IP);
Tmp3 = BinaryOperator::CreateAnd(Tmp3,
"bswap.and4");
Tmp3 = Builder.CreateAnd(Tmp3,
ConstantInt::get(Type::Int64Ty, 0xFF0000ULL),
"bswap.and3", IP);
Tmp2 = BinaryOperator::CreateAnd(Tmp2,
"bswap.and3");
Tmp2 = Builder.CreateAnd(Tmp2,
ConstantInt::get(Type::Int64Ty, 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);
"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;
}
}
@ -266,6 +246,8 @@ static Value *LowerCTPOP(Value *V, Instruction *IP) {
0x0000FFFF0000FFFFULL, 0x00000000FFFFFFFFULL
};
IRBuilder<> Builder(IP->getParent(), IP);
unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
unsigned WordSize = (BitSize + 63) / 64;
Value *Count = ConstantInt::get(V->getType(), 0);
@ -275,17 +257,17 @@ static Value *LowerCTPOP(Value *V, Instruction *IP) {
for (unsigned i = 1, ct = 0; i < (BitSize>64 ? 64 : BitSize);
i <<= 1, ++ct) {
Value *MaskCst = ConstantInt::get(V->getType(), MaskValues[ct]);
Value *LHS = BinaryOperator::CreateAnd(
PartValue, MaskCst, "cppop.and1", IP);
Value *VShift = BinaryOperator::CreateLShr(PartValue,
ConstantInt::get(V->getType(), i), "ctpop.sh", IP);
Value *RHS = BinaryOperator::CreateAnd(VShift, MaskCst, "cppop.and2", IP);
PartValue = BinaryOperator::CreateAdd(LHS, RHS, "ctpop.step", IP);
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 = BinaryOperator::CreateAdd(PartValue, Count, "ctpop.part", IP);
Count = Builder.CreateAdd(PartValue, Count, "ctpop.part");
if (BitSize > 64) {
V = BinaryOperator::CreateLShr(V, ConstantInt::get(V->getType(), 64),
"ctpop.part.sh", IP);
V = Builder.CreateLShr(V, ConstantInt::get(V->getType(), 64),
"ctpop.part.sh");
BitSize -= 64;
}
}
@ -297,14 +279,16 @@ static Value *LowerCTPOP(Value *V, Instruction *IP) {
/// instruction IP.
static Value *LowerCTLZ(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 = BinaryOperator::CreateLShr(V, ShVal, "ctlz.sh", IP);
V = BinaryOperator::CreateOr(V, ShVal, "ctlz.step", IP);
ShVal = Builder.CreateLShr(V, ShVal, "ctlz.sh");
V = Builder.CreateOr(V, ShVal, "ctlz.step");
}
V = BinaryOperator::CreateNot(V, "", IP);
V = Builder.CreateNot(V);
return LowerCTPOP(V, IP);
}
@ -319,6 +303,8 @@ static Value *LowerCTLZ(Value *V, Instruction *IP) {
/// the bits are returned in inverse order.
/// @brief Lowering of llvm.part.select intrinsic.
static Instruction *LowerPartSelect(CallInst *CI) {
IRBuilder<> Builder;
// Make sure we're dealing with a part select intrinsic here
Function *F = CI->getCalledFunction();
const FunctionType *FT = F->getFunctionType();
@ -359,13 +345,15 @@ static Instruction *LowerPartSelect(CallInst *CI) {
BasicBlock *Reverse = BasicBlock::Create("reverse", CurBB->getParent());
BasicBlock *RsltBlk = BasicBlock::Create("result", CurBB->getParent());
Builder.SetInsertPoint(CurBB);
// Cast Hi and Lo to the size of Val so the widths are all the same
if (Hi->getType() != Val->getType())
Hi = CastInst::CreateIntegerCast(Hi, Val->getType(), false,
"tmp", CurBB);
Hi = Builder.CreateIntCast(Hi, Val->getType(), /* isSigned */ false,
"tmp");
if (Lo->getType() != Val->getType())
Lo = CastInst::CreateIntegerCast(Lo, Val->getType(), false,
"tmp", CurBB);
Lo = Builder.CreateIntCast(Lo, Val->getType(), /* isSigned */ false,
"tmp");
// Compute a few things that both cases will need, up front.
Constant* Zero = ConstantInt::get(Val->getType(), 0);
@ -374,18 +362,18 @@ static Instruction *LowerPartSelect(CallInst *CI) {
// Compare the Hi and Lo bit positions. This is used to determine
// which case we have (forward or reverse)
ICmpInst *Cmp = new ICmpInst(ICmpInst::ICMP_ULT, Hi, Lo, "less",CurBB);
BranchInst::Create(RevSize, FwdSize, Cmp, CurBB);
Value *Cmp = Builder.CreateICmpULT(Hi, Lo, "less");
Builder.CreateCondBr(Cmp, RevSize, FwdSize);
// First, copmute the number of bits in the forward case.
Instruction* FBitSize =
BinaryOperator::CreateSub(Hi, Lo,"fbits", FwdSize);
BranchInst::Create(Compute, FwdSize);
// First, compute the number of bits in the forward case.
Builder.SetInsertPoint(FwdSize);
Value* FBitSize = Builder.CreateSub(Hi, Lo, "fbits");
Builder.CreateBr(Compute);
// Second, compute the number of bits in the reverse case.
Instruction* RBitSize =
BinaryOperator::CreateSub(Lo, Hi, "rbits", RevSize);
BranchInst::Create(Compute, RevSize);
Builder.SetInsertPoint(RevSize);
Value* RBitSize = Builder.CreateSub(Lo, Hi, "rbits");
Builder.CreateBr(Compute);
// Now, compute the bit range. Start by getting the bitsize and the shift
// amount (either Hi or Lo) from PHI nodes. Then we compute a mask for
@ -393,94 +381,88 @@ static Instruction *LowerPartSelect(CallInst *CI) {
// least significant bits, apply the mask to zero out unwanted high bits,
// and we have computed the "forward" result. It may still need to be
// reversed.
Builder.SetInsertPoint(Compute);
// Get the BitSize from one of the two subtractions
PHINode *BitSize = PHINode::Create(Val->getType(), "bits", Compute);
PHINode *BitSize = Builder.CreatePHI(Val->getType(), "bits");
BitSize->reserveOperandSpace(2);
BitSize->addIncoming(FBitSize, FwdSize);
BitSize->addIncoming(RBitSize, RevSize);
// Get the ShiftAmount as the smaller of Hi/Lo
PHINode *ShiftAmt = PHINode::Create(Val->getType(), "shiftamt", Compute);
PHINode *ShiftAmt = Builder.CreatePHI(Val->getType(), "shiftamt");
ShiftAmt->reserveOperandSpace(2);
ShiftAmt->addIncoming(Lo, FwdSize);
ShiftAmt->addIncoming(Hi, RevSize);
// Increment the bit size
Instruction *BitSizePlusOne =
BinaryOperator::CreateAdd(BitSize, One, "bits", Compute);
Value *BitSizePlusOne = Builder.CreateAdd(BitSize, One, "bits");
// Create a Mask to zero out the high order bits.
Instruction* Mask =
BinaryOperator::CreateShl(AllOnes, BitSizePlusOne, "mask", Compute);
Mask = BinaryOperator::CreateNot(Mask, "mask", Compute);
Value* Mask = Builder.CreateShl(AllOnes, BitSizePlusOne, "mask");
Mask = Builder.CreateNot(Mask, "mask");
// Shift the bits down and apply the mask
Instruction* FRes =
BinaryOperator::CreateLShr(Val, ShiftAmt, "fres", Compute);
FRes = BinaryOperator::CreateAnd(FRes, Mask, "fres", Compute);
BranchInst::Create(Reverse, RsltBlk, Cmp, Compute);
Value* FRes = Builder.CreateLShr(Val, ShiftAmt, "fres");
FRes = Builder.CreateAnd(FRes, Mask, "fres");
Builder.CreateCondBr(Cmp, Reverse, RsltBlk);
// In the Reverse block we have the mask already in FRes but we must reverse
// it by shifting FRes bits right and putting them in RRes by shifting them
// in from left.
Builder.SetInsertPoint(Reverse);
// First set up our loop counters
PHINode *Count = PHINode::Create(Val->getType(), "count", Reverse);
PHINode *Count = Builder.CreatePHI(Val->getType(), "count");
Count->reserveOperandSpace(2);
Count->addIncoming(BitSizePlusOne, Compute);
// Next, get the value that we are shifting.
PHINode *BitsToShift = PHINode::Create(Val->getType(), "val", Reverse);
PHINode *BitsToShift = Builder.CreatePHI(Val->getType(), "val");
BitsToShift->reserveOperandSpace(2);
BitsToShift->addIncoming(FRes, Compute);
// Finally, get the result of the last computation
PHINode *RRes = PHINode::Create(Val->getType(), "rres", Reverse);
PHINode *RRes = Builder.CreatePHI(Val->getType(), "rres");
RRes->reserveOperandSpace(2);
RRes->addIncoming(Zero, Compute);
// Decrement the counter
Instruction *Decr = BinaryOperator::CreateSub(Count, One, "decr", Reverse);
Value *Decr = Builder.CreateSub(Count, One, "decr");
Count->addIncoming(Decr, Reverse);
// Compute the Bit that we want to move
Instruction *Bit =
BinaryOperator::CreateAnd(BitsToShift, One, "bit", Reverse);
Value *Bit = Builder.CreateAnd(BitsToShift, One, "bit");
// Compute the new value for next iteration.
Instruction *NewVal =
BinaryOperator::CreateLShr(BitsToShift, One, "rshift", Reverse);
Value *NewVal = Builder.CreateLShr(BitsToShift, One, "rshift");
BitsToShift->addIncoming(NewVal, Reverse);
// Shift the bit into the low bits of the result.
Instruction *NewRes =
BinaryOperator::CreateShl(RRes, One, "lshift", Reverse);
NewRes = BinaryOperator::CreateOr(NewRes, Bit, "addbit", Reverse);
Value *NewRes = Builder.CreateShl(RRes, One, "lshift");
NewRes = Builder.CreateOr(NewRes, Bit, "addbit");
RRes->addIncoming(NewRes, Reverse);
// Terminate loop if we've moved all the bits.
ICmpInst *Cond =
new ICmpInst(ICmpInst::ICMP_EQ, Decr, Zero, "cond", Reverse);
BranchInst::Create(RsltBlk, Reverse, Cond, Reverse);
Value *Cond = Builder.CreateICmpEQ(Decr, Zero, "cond");
Builder.CreateCondBr(Cond, RsltBlk, Reverse);
// Finally, in the result block, select one of the two results with a PHI
// node and return the result;
CurBB = RsltBlk;
PHINode *BitSelect = PHINode::Create(Val->getType(), "part_select", CurBB);
Builder.SetInsertPoint(RsltBlk);
PHINode *BitSelect = Builder.CreatePHI(Val->getType(), "part_select");
BitSelect->reserveOperandSpace(2);
BitSelect->addIncoming(FRes, Compute);
BitSelect->addIncoming(NewRes, Reverse);
ReturnInst::Create(BitSelect, CurBB);
Builder.CreateRet(BitSelect);
}
// Return a call to the implementation function
Value *Args[] = {
CI->getOperand(1),
CI->getOperand(2),
CI->getOperand(3)
};
return CallInst::Create(F, Args, array_endof(Args), CI->getName(), CI);
Builder.SetInsertPoint(CI->getParent(), CI);
CallInst *NewCI = Builder.CreateCall3(F, CI->getOperand(1),
CI->getOperand(2), CI->getOperand(3));
NewCI->setName(CI->getName());
return NewCI;
}
/// Convert the llvm.part.set.iX.iY.iZ intrinsic. This intrinsic takes
@ -492,6 +474,8 @@ static Instruction *LowerPartSelect(CallInst *CI) {
/// greater than %High then the inverse set of bits are replaced.
/// @brief Lowering of llvm.bit.part.set intrinsic.
static Instruction *LowerPartSet(CallInst *CI) {
IRBuilder<> Builder;
// Make sure we're dealing with a part select intrinsic here
Function *F = CI->getCalledFunction();
const FunctionType *FT = F->getFunctionType();
@ -543,101 +527,101 @@ static Instruction *LowerPartSet(CallInst *CI) {
BasicBlock* result = BasicBlock::Create("result", F, 0);
// BASIC BLOCK: entry
Builder.SetInsertPoint(entry);
// First, get the number of bits that we're placing as an i32
ICmpInst* is_forward =
new ICmpInst(ICmpInst::ICMP_ULT, Lo, Hi, "", entry);
SelectInst* Hi_pn = SelectInst::Create(is_forward, Hi, Lo, "", entry);
SelectInst* Lo_pn = SelectInst::Create(is_forward, Lo, Hi, "", entry);
BinaryOperator* NumBits = BinaryOperator::CreateSub(Hi_pn, Lo_pn, "",entry);
NumBits = BinaryOperator::CreateAdd(NumBits, One, "", entry);
Value* is_forward = Builder.CreateICmpULT(Lo, Hi);
Value* Hi_pn = Builder.CreateSelect(is_forward, Hi, Lo);
Value* Lo_pn = Builder.CreateSelect(is_forward, Lo, Hi);
Value* NumBits = Builder.CreateSub(Hi_pn, Lo_pn);
NumBits = Builder.CreateAdd(NumBits, One);
// Now, convert Lo and Hi to ValTy bit width
Lo = getZExtOrTrunc(Lo_pn, ValTy, entry);
Lo = Builder.CreateIntCast(Lo_pn, ValTy, /* isSigned */ false);
// Determine if the replacement bits are larger than the number of bits we
// are replacing and deal with it.
ICmpInst* is_large =
new ICmpInst(ICmpInst::ICMP_ULT, NumBits, RepBitWidth, "", entry);
BranchInst::Create(large, small, is_large, entry);
Value* is_large = Builder.CreateICmpULT(NumBits, RepBitWidth);
Builder.CreateCondBr(is_large, large, small);
// BASIC BLOCK: large
Instruction* MaskBits =
BinaryOperator::CreateSub(RepBitWidth, NumBits, "", large);
MaskBits = CastInst::CreateIntegerCast(MaskBits, RepMask->getType(),
false, "", large);
BinaryOperator* Mask1 =
BinaryOperator::CreateLShr(RepMask, MaskBits, "", large);
BinaryOperator* Rep2 = BinaryOperator::CreateAnd(Mask1, Rep, "", large);
BranchInst::Create(small, large);
Builder.SetInsertPoint(large);
Value* MaskBits = Builder.CreateSub(RepBitWidth, NumBits);
MaskBits = Builder.CreateIntCast(MaskBits, RepMask->getType(),
/* isSigned */ false);
Value* Mask1 = Builder.CreateLShr(RepMask, MaskBits);
Value* Rep2 = Builder.CreateAnd(Mask1, Rep);
Builder.CreateBr(small);
// BASIC BLOCK: small
PHINode* Rep3 = PHINode::Create(RepTy, "", small);
Builder.SetInsertPoint(small);
PHINode* Rep3 = Builder.CreatePHI(RepTy);
Rep3->reserveOperandSpace(2);
Rep3->addIncoming(Rep2, large);
Rep3->addIncoming(Rep, entry);
Value* Rep4 = getZExtOrTrunc(Rep3, ValTy, small);
BranchInst::Create(result, reverse, is_forward, small);
Value* Rep4 = Builder.CreateIntCast(Rep3, ValTy, /* isSigned */ false);
Builder.CreateCondBr(is_forward, result, reverse);
// BASIC BLOCK: reverse (reverses the bits of the replacement)
Builder.SetInsertPoint(reverse);
// Set up our loop counter as a PHI so we can decrement on each iteration.
// We will loop for the number of bits in the replacement value.
PHINode *Count = PHINode::Create(Type::Int32Ty, "count", reverse);
PHINode *Count = Builder.CreatePHI(Type::Int32Ty, "count");
Count->reserveOperandSpace(2);
Count->addIncoming(NumBits, small);
// Get the value that we are shifting bits out of as a PHI because
// we'll change this with each iteration.
PHINode *BitsToShift = PHINode::Create(Val->getType(), "val", reverse);
PHINode *BitsToShift = Builder.CreatePHI(Val->getType(), "val");
BitsToShift->reserveOperandSpace(2);
BitsToShift->addIncoming(Rep4, small);
// Get the result of the last computation or zero on first iteration
PHINode *RRes = PHINode::Create(Val->getType(), "rres", reverse);
PHINode *RRes = Builder.CreatePHI(Val->getType(), "rres");
RRes->reserveOperandSpace(2);
RRes->addIncoming(ValZero, small);
// Decrement the loop counter by one
Instruction *Decr = BinaryOperator::CreateSub(Count, One, "", reverse);
Value *Decr = Builder.CreateSub(Count, One);
Count->addIncoming(Decr, reverse);
// Get the bit that we want to move into the result
Value *Bit = BinaryOperator::CreateAnd(BitsToShift, ValOne, "", reverse);
Value *Bit = Builder.CreateAnd(BitsToShift, ValOne);
// Compute the new value of the bits to shift for the next iteration.
Value *NewVal = BinaryOperator::CreateLShr(BitsToShift, ValOne,"", reverse);
Value *NewVal = Builder.CreateLShr(BitsToShift, ValOne);
BitsToShift->addIncoming(NewVal, reverse);
// Shift the bit we extracted into the low bit of the result.
Instruction *NewRes = BinaryOperator::CreateShl(RRes, ValOne, "", reverse);
NewRes = BinaryOperator::CreateOr(NewRes, Bit, "", reverse);
Value *NewRes = Builder.CreateShl(RRes, ValOne);
NewRes = Builder.CreateOr(NewRes, Bit);
RRes->addIncoming(NewRes, reverse);
// Terminate loop if we've moved all the bits.
ICmpInst *Cond = new ICmpInst(ICmpInst::ICMP_EQ, Decr, Zero, "", reverse);
BranchInst::Create(result, reverse, Cond, reverse);
Value *Cond = Builder.CreateICmpEQ(Decr, Zero);
Builder.CreateCondBr(Cond, result, reverse);
// BASIC BLOCK: result
PHINode *Rplcmnt = PHINode::Create(Val->getType(), "", result);
Builder.SetInsertPoint(result);
PHINode *Rplcmnt = Builder.CreatePHI(Val->getType());
Rplcmnt->reserveOperandSpace(2);
Rplcmnt->addIncoming(NewRes, reverse);
Rplcmnt->addIncoming(Rep4, small);
Value* t0 = CastInst::CreateIntegerCast(NumBits,ValTy,false,"",result);
Value* t1 = BinaryOperator::CreateShl(ValMask, Lo, "", result);
Value* t2 = BinaryOperator::CreateNot(t1, "", result);
Value* t3 = BinaryOperator::CreateShl(t1, t0, "", result);
Value* t4 = BinaryOperator::CreateOr(t2, t3, "", result);
Value* t5 = BinaryOperator::CreateAnd(t4, Val, "", result);
Value* t6 = BinaryOperator::CreateShl(Rplcmnt, Lo, "", result);
Value* Rslt = BinaryOperator::CreateOr(t5, t6, "part_set", result);
ReturnInst::Create(Rslt, result);
Value* t0 = Builder.CreateIntCast(NumBits, ValTy, /* isSigned */ false);
Value* t1 = Builder.CreateShl(ValMask, Lo);
Value* t2 = Builder.CreateNot(t1);
Value* t3 = Builder.CreateShl(t1, t0);
Value* t4 = Builder.CreateOr(t2, t3);
Value* t5 = Builder.CreateAnd(t4, Val);
Value* t6 = Builder.CreateShl(Rplcmnt, Lo);
Value* Rslt = Builder.CreateOr(t5, t6, "part_set");
Builder.CreateRet(Rslt);
}
// Return a call to the implementation function
Value *Args[] = {
CI->getOperand(1),
CI->getOperand(2),
CI->getOperand(3),
CI->getOperand(4)
};
return CallInst::Create(F, Args, array_endof(Args), CI->getName(), CI);
Builder.SetInsertPoint(CI->getParent(), CI);
CallInst *NewCI = Builder.CreateCall4(F, CI->getOperand(1),
CI->getOperand(2), CI->getOperand(3),
CI->getOperand(4));
NewCI->setName(CI->getName());
return NewCI;
}
static void ReplaceFPIntrinsicWithCall(CallInst *CI, Constant *FCache,
@ -647,23 +631,25 @@ static void ReplaceFPIntrinsicWithCall(CallInst *CI, Constant *FCache,
switch (CI->getOperand(1)->getType()->getTypeID()) {
default: assert(0 && "Invalid type in intrinsic"); abort();
case Type::FloatTyID:
ReplaceCallWith(Fname, CI, CI->op_begin()+1, CI->op_end(),
ReplaceCallWith(Fname, CI, CI->op_begin() + 1, CI->op_end(),
Type::FloatTy, FCache);
break;
case Type::DoubleTyID:
ReplaceCallWith(Dname, CI, CI->op_begin()+1, CI->op_end(),
ReplaceCallWith(Dname, CI, CI->op_begin() + 1, CI->op_end(),
Type::DoubleTy, DCache);
break;
case Type::X86_FP80TyID:
case Type::FP128TyID:
case Type::PPC_FP128TyID:
ReplaceCallWith(LDname, CI, CI->op_begin()+1, CI->op_end(),
ReplaceCallWith(LDname, CI, CI->op_begin() + 1, CI->op_end(),
CI->getOperand(1)->getType(), LDCache);
break;
}
}
void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
IRBuilder<> Builder(CI->getParent(), CI);
Function *Callee = CI->getCalledFunction();
assert(Callee && "Cannot lower an indirect call!");
@ -683,7 +669,7 @@ void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
// convert the call to an explicit setjmp or longjmp call.
case Intrinsic::setjmp: {
static Constant *SetjmpFCache = 0;
Value *V = ReplaceCallWith("setjmp", CI, CI->op_begin()+1, CI->op_end(),
Value *V = ReplaceCallWith("setjmp", CI, CI->op_begin() + 1, CI->op_end(),
Type::Int32Ty, SetjmpFCache);
if (CI->getType() != Type::VoidTy)
CI->replaceAllUsesWith(V);
@ -696,7 +682,7 @@ void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
case Intrinsic::longjmp: {
static Constant *LongjmpFCache = 0;
ReplaceCallWith("longjmp", CI, CI->op_begin()+1, CI->op_end(),
ReplaceCallWith("longjmp", CI, CI->op_begin() + 1, CI->op_end(),
Type::VoidTy, LongjmpFCache);
break;
}
@ -723,10 +709,11 @@ void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
case Intrinsic::cttz: {
// cttz(x) -> ctpop(~X & (X-1))
Value *Src = CI->getOperand(1);
Value *NotSrc = BinaryOperator::CreateNot(Src, Src->getName()+".not", CI);
Value *NotSrc = Builder.CreateNot(Src);
NotSrc->setName(Src->getName() + ".not");
Value *SrcM1 = ConstantInt::get(Src->getType(), 1);
SrcM1 = BinaryOperator::CreateSub(Src, SrcM1, "", CI);
Src = LowerCTPOP(BinaryOperator::CreateAnd(NotSrc, SrcM1, "", CI), CI);
SrcM1 = Builder.CreateSub(Src, SrcM1);
Src = LowerCTPOP(Builder.CreateAnd(NotSrc, SrcM1), CI);
CI->replaceAllUsesWith(Src);
break;
}
@ -798,7 +785,8 @@ void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
case Intrinsic::memcpy: {
static Constant *MemcpyFCache = 0;
const IntegerType *IntPtr = TD.getIntPtrType();
Value *Size = getZExtOrTrunc(CI->getOperand(3), IntPtr, CI);
Value *Size = Builder.CreateIntCast(CI->getOperand(3), IntPtr,
/* isSigned */ false);
Value *Ops[3];
Ops[0] = CI->getOperand(1);
Ops[1] = CI->getOperand(2);
@ -810,7 +798,8 @@ void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
case Intrinsic::memmove: {
static Constant *MemmoveFCache = 0;
const IntegerType *IntPtr = TD.getIntPtrType();
Value *Size = getZExtOrTrunc(CI->getOperand(3), IntPtr, CI);
Value *Size = Builder.CreateIntCast(CI->getOperand(3), IntPtr,
/* isSigned */ false);
Value *Ops[3];
Ops[0] = CI->getOperand(1);
Ops[1] = CI->getOperand(2);
@ -822,11 +811,13 @@ void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
case Intrinsic::memset: {
static Constant *MemsetFCache = 0;
const IntegerType *IntPtr = TD.getIntPtrType();
Value *Size = getZExtOrTrunc(CI->getOperand(3), IntPtr, CI);
Value *Size = Builder.CreateIntCast(CI->getOperand(3), IntPtr,
/* isSigned */ false);
Value *Ops[3];
Ops[0] = CI->getOperand(1);
// Extend the amount to i32.
Ops[1] = getZExtOrTrunc(CI->getOperand(2), Type::Int32Ty, CI);
Ops[1] = Builder.CreateIntCast(CI->getOperand(2), Type::Int32Ty,
/* isSigned */ false);
Ops[2] = Size;
ReplaceCallWith("memset", CI, Ops, Ops+3, CI->getOperand(1)->getType(),
MemsetFCache);