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Add support for constant folding the pow intrinsic.

Browse Source 
rdar://10514247

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145730 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier 2011-12-03 00:00:03 +00:00
parent 587f5062b9
commit 24fbf2bf16
2 changed files with 15 additions and 3 deletions
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9
lib/Analysis/ConstantFolding.cpp
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@ -1053,6 +1053,7 @@ bool
llvm::canConstantFoldCallTo(const Function *F) {
switch (F->getIntrinsicID()) {
case Intrinsic::sqrt:
case Intrinsic::pow:
case Intrinsic::powi:
case Intrinsic::bswap:
case Intrinsic::ctpop:
@ -1346,9 +1347,6 @@ llvm::ConstantFoldCall(Function *F, ArrayRef<Constant *> Operands,
(double)Op1->getValueAPF().convertToFloat() :
Op1->getValueAPF().convertToDouble();
if (ConstantFP *Op2 = dyn_cast<ConstantFP>(Operands[1])) {
if (!TLI)
return 0;
if (Op2->getType() != Op1->getType())
return 0;
@ -1356,6 +1354,11 @@ llvm::ConstantFoldCall(Function *F, ArrayRef<Constant *> Operands,
(double)Op2->getValueAPF().convertToFloat():
Op2->getValueAPF().convertToDouble();
if (F->getIntrinsicID() == Intrinsic::pow) {
return ConstantFoldBinaryFP(pow, Op1V, Op2V, Ty);
}
if (!TLI)
return 0;
if (Name == "pow" && TLI->has(LibFunc::pow))
return ConstantFoldBinaryFP(pow, Op1V, Op2V, Ty);
if (Name == "fmod" && TLI->has(LibFunc::fmod))

9
test/Transforms/ConstProp/calls.ll
View File

@ -61,6 +61,15 @@ declare i32 @llvm.x86.sse2.cvttsd2si(<2 x double>) nounwind readnone
declare i64 @llvm.x86.sse2.cvtsd2si64(<2 x double>) nounwind readnone
declare i64 @llvm.x86.sse2.cvttsd2si64(<2 x double>) nounwind readnone
define double @test_intrinsic_pow() nounwind uwtable ssp {
entry:
; CHECK: @test_intrinsic_pow
; CHECK-NOT: call
%0 = call double @llvm.pow.f64(double 1.500000e+00, double 3.000000e+00)
ret double %0
}
declare double @llvm.pow.f64(double, double) nounwind readonly
; Shouldn't fold because of -fno-builtin
define double @sin_() nounwind uwtable ssp {
; FNOBUILTIN: @sin_