[SLC] Emit an intrinsic instead of a libcall for pow.
Differential Revision: https://reviews.llvm.org/D22104
llvm-svn: 277963
diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
index c298695..5e648db 100644
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -993,16 +993,20 @@
Ret = optimizeUnaryDoubleFP(CI, B, true);
Value *Op1 = CI->getArgOperand(0), *Op2 = CI->getArgOperand(1);
+
+ // pow(1.0, x) -> 1.0
+ if (match(Op1, m_SpecificFP(1.0)))
+ return Op1;
+ // pow(2.0, x) -> llvm.exp2(x)
+ if (match(Op1, m_SpecificFP(2.0))) {
+ Value *Exp2 = Intrinsic::getDeclaration(CI->getModule(), Intrinsic::exp2,
+ CI->getType());
+ return B.CreateCall(Exp2, Op2, "exp2");
+ }
+
+ // There's no llvm.exp10 intrinsic yet, but, maybe, some day there will
+ // be one.
if (ConstantFP *Op1C = dyn_cast<ConstantFP>(Op1)) {
- // pow(1.0, x) -> 1.0
- if (Op1C->isExactlyValue(1.0))
- return Op1C;
- // pow(2.0, x) -> exp2(x)
- if (Op1C->isExactlyValue(2.0) &&
- hasUnaryFloatFn(TLI, Op1->getType(), LibFunc::exp2, LibFunc::exp2f,
- LibFunc::exp2l))
- return emitUnaryFloatFnCall(Op2, TLI->getName(LibFunc::exp2), B,
- Callee->getAttributes());
// pow(10.0, x) -> exp10(x)
if (Op1C->isExactlyValue(10.0) &&
hasUnaryFloatFn(TLI, Op1->getType(), LibFunc::exp10, LibFunc::exp10f,