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SimplifyLibCalls: Remove checks for fabs

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Use the intrinsic instead of emitting the libcall which
will be replaced by the intrinsic.

llvm-svn: 292176
This commit is contained in:
Matt Arsenault 2017-01-17 00:30:31 +00:00
parent 4212c78a62
commit 018a8adda0
2 changed files with 12 additions and 7 deletions
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12
lib/Transforms/Utils/SimplifyLibCalls.cpp
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@ -1094,9 +1094,7 @@ Value *LibCallSimplifier::optimizePow(CallInst *CI, IRBuilder<> &B) {
if (Op2C->isExactlyValue(0.5) &&
hasUnaryFloatFn(TLI, Op2->getType(), LibFunc::sqrt, LibFunc::sqrtf,
LibFunc::sqrtl) &&
hasUnaryFloatFn(TLI, Op2->getType(), LibFunc::fabs, LibFunc::fabsf,
LibFunc::fabsl)) {
LibFunc::sqrtl)) {
// In -ffast-math, pow(x, 0.5) -> sqrt(x).
if (CI->hasUnsafeAlgebra()) {
@ -1116,8 +1114,12 @@ Value *LibCallSimplifier::optimizePow(CallInst *CI, IRBuilder<> &B) {
Value *Inf = ConstantFP::getInfinity(CI->getType());
Value *NegInf = ConstantFP::getInfinity(CI->getType(), true);
Value *Sqrt = emitUnaryFloatFnCall(Op1, "sqrt", B, Callee->getAttributes());
Value *FAbs =
emitUnaryFloatFnCall(Sqrt, "fabs", B, Callee->getAttributes());
Module *M = Callee->getParent();
Function *FabsF = Intrinsic::getDeclaration(M, Intrinsic::fabs,
CI->getType());
Value *FAbs = B.CreateCall(FabsF, Sqrt);
Value *FCmp = B.CreateFCmpOEQ(Op1, NegInf);
Value *Sel = B.CreateSelect(FCmp, Inf, FAbs);
return Sel;

7
test/Transforms/InstCombine/win-math.ll
View File

@ -279,9 +279,12 @@ define float @float_powsqrt(float %x) nounwind readnone {
; WIN32-LABEL: @float_powsqrt(
; WIN32-NOT: float @sqrtf
; WIN32: float @powf
; WIN64-LABEL: @float_powsqrt(
; WIN64-NOT: float @sqrtf
; WIN64: float @powf
; WIN64: float @sqrtf
; WIN64: float @llvm.fabs.f32(
; WIN64-NOT: float @powf
; MINGW32-LABEL: @float_powsqrt(
; MINGW32: float @sqrtf
; MINGW32: float @llvm.fabs.f32