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For PR1297:

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Support overloaded intrinsics bswap, ctpop, cttz, ctlz.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35547 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-04-01 07:35:23 +00:00
parent a4f9c4d29a
commit e9391fd9b5
3 changed files with 28 additions and 65 deletions
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40
lib/Analysis/ConstantFolding.cpp
View File

@ -317,24 +317,12 @@ llvm::canConstantFoldCallTo(Function *F) {
switch (F->getIntrinsicID()) {
case Intrinsic::sqrt_f32:
case Intrinsic::sqrt_f64:
case Intrinsic::bswap_i16:
case Intrinsic::bswap_i32:
case Intrinsic::bswap_i64:
case Intrinsic::powi_f32:
case Intrinsic::powi_f64:
// FIXME: these should be constant folded as well
//case Intrinsic::ctpop_i8:
//case Intrinsic::ctpop_i16:
//case Intrinsic::ctpop_i32:
//case Intrinsic::ctpop_i64:
//case Intrinsic::ctlz_i8:
//case Intrinsic::ctlz_i16:
//case Intrinsic::ctlz_i32:
//case Intrinsic::ctlz_i64:
//case Intrinsic::cttz_i8:
//case Intrinsic::cttz_i16:
//case Intrinsic::cttz_i32:
//case Intrinsic::cttz_i64:
case Intrinsic::bswap:
case Intrinsic::ctpop:
case Intrinsic::ctlz:
case Intrinsic::cttz:
return true;
default: break;
}
@ -445,13 +433,19 @@ llvm::ConstantFoldCall(Function *F, Constant** Operands, unsigned NumOperands) {
break;
}
} else if (ConstantInt *Op = dyn_cast<ConstantInt>(Operands[0])) {
uint64_t V = Op->getZExtValue();
if (Name == "llvm.bswap.i16")
return ConstantInt::get(Ty, ByteSwap_16(V));
else if (Name == "llvm.bswap.i32")
return ConstantInt::get(Ty, ByteSwap_32(V));
else if (Name == "llvm.bswap.i64")
return ConstantInt::get(Ty, ByteSwap_64(V));
const IntegerType *OpTy = cast<IntegerType>(Op->getType());
if (Name.size() > 11 && !memcmp(&Name[0], "llvm.bswap", 10)) {
return ConstantInt::get(Op->getValue().byteSwap());
} else if (Name.size() > 11 && !memcmp(&Name[0],"llvm.ctpop",10)) {
uint64_t ctpop = Op->getValue().countPopulation();
return ConstantInt::get(OpTy, ctpop);
} else if (Name.size() > 10 && !memcmp(&Name[0], "llvm.cttz", 9)) {
uint64_t cttz = Op->getValue().countTrailingZeros();
return ConstantInt::get(OpTy, cttz);
} else if (Name.size() > 10 && !memcmp(&Name[0], "llvm.ctlz", 9)) {
uint64_t ctlz = Op->getValue().countLeadingZeros();
return ConstantInt::get(OpTy, ctlz);
}
}
} else if (NumOperands == 2) {
if (ConstantFP *Op1 = dyn_cast<ConstantFP>(Operands[0])) {

21
lib/CodeGen/IntrinsicLowering.cpp
View File

@ -236,8 +236,6 @@ static Value *LowerCTLZ(Value *V, Instruction *IP) {
return LowerCTPOP(V, IP);
}
void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
Function *Callee = CI->getCalledFunction();
assert(Callee && "Cannot lower an indirect call!");
@ -283,30 +281,19 @@ void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
Type::VoidTy, AbortFCache);
break;
}
case Intrinsic::ctpop_i8:
case Intrinsic::ctpop_i16:
case Intrinsic::ctpop_i32:
case Intrinsic::ctpop_i64:
case Intrinsic::ctpop:
CI->replaceAllUsesWith(LowerCTPOP(CI->getOperand(1), CI));
break;
case Intrinsic::bswap_i16:
case Intrinsic::bswap_i32:
case Intrinsic::bswap_i64:
case Intrinsic::bswap:
CI->replaceAllUsesWith(LowerBSWAP(CI->getOperand(1), CI));
break;
case Intrinsic::ctlz_i8:
case Intrinsic::ctlz_i16:
case Intrinsic::ctlz_i32:
case Intrinsic::ctlz_i64:
case Intrinsic::ctlz:
CI->replaceAllUsesWith(LowerCTLZ(CI->getOperand(1), CI));
break;
case Intrinsic::cttz_i8:
case Intrinsic::cttz_i16:
case Intrinsic::cttz_i32:
case Intrinsic::cttz_i64: {
case Intrinsic::cttz: {
// cttz(x) -> ctpop(~X & (X-1))
Value *Src = CI->getOperand(1);
Value *NotSrc = BinaryOperator::createNot(Src, Src->getName()+".not", CI);

32
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -3624,11 +3624,11 @@ Instruction *InstCombiner::MatchBSwap(BinaryOperator &I) {
Module *M = I.getParent()->getParent()->getParent();
const char *FnName = 0;
if (I.getType() == Type::Int16Ty)
FnName = "llvm.bswap.i16";
FnName = "llvm.bswap.i16.i16";
else if (I.getType() == Type::Int32Ty)
FnName = "llvm.bswap.i32";
FnName = "llvm.bswap.i32.i32";
else if (I.getType() == Type::Int64Ty)
FnName = "llvm.bswap.i64";
FnName = "llvm.bswap.i64.i64";
else
assert(0 && "Unknown integer type!");
Constant *F = M->getOrInsertFunction(FnName, I.getType(), I.getType(), NULL);
@ -5173,29 +5173,11 @@ Instruction *InstCombiner::visitICmpInst(ICmpInst &I) {
default: break;
}
} else if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(Op0)) {
// Handle set{eq|ne} <intrinsic>, intcst.
switch (II->getIntrinsicID()) {
default: break;
case Intrinsic::bswap_i16:
// icmp eq (bswap(x)), c -> icmp eq (x,bswap(c))
AddToWorkList(II); // Dead?
// Handle icmp {eq|ne} <intrinsic>, intcst.
if (II->getIntrinsicID() == Intrinsic::bswap) {
AddToWorkList(II);
I.setOperand(0, II->getOperand(1));
I.setOperand(1, ConstantInt::get(Type::Int16Ty,
ByteSwap_16(CI->getZExtValue())));
return &I;
case Intrinsic::bswap_i32:
// icmp eq (bswap(x)), c -> icmp eq (x,bswap(c))
AddToWorkList(II); // Dead?
I.setOperand(0, II->getOperand(1));
I.setOperand(1, ConstantInt::get(Type::Int32Ty,
ByteSwap_32(CI->getZExtValue())));
return &I;
case Intrinsic::bswap_i64:
// icmp eq (bswap(x)), c -> icmp eq (x,bswap(c))
AddToWorkList(II); // Dead?
I.setOperand(0, II->getOperand(1));
I.setOperand(1, ConstantInt::get(Type::Int64Ty,
ByteSwap_64(CI->getZExtValue())));
I.setOperand(1, ConstantInt::get(CI->getValue().byteSwap()));
return &I;
}
}