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| author | Sanjay Patel <spatel@rotateright.com> | 2016-01-12 19:06:35 +0000 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2016-01-12 19:06:35 +0000 |
| commit | 53ba88dbb042132bbaf7e5ca6ccc2d5051272581 (patch) | |
| tree | 70b2762ffa49886f774ef53b8d8902e262cf39fb /llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp | |
| parent | 87b0fe075ea2573a0009ceef8cc84f05f7b2f782 (diff) | |
| download | bcm5719-llvm-53ba88dbb042132bbaf7e5ca6ccc2d5051272581.tar.gz bcm5719-llvm-53ba88dbb042132bbaf7e5ca6ccc2d5051272581.zip | |
[LibCallSimplifier] use instruction-level fast-math-flags to transform pow(x, 0.5) calls
Also, propagate the FMF to the newly created sqrt() call.
llvm-svn: 257503
Diffstat (limited to 'llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp index 2551abef75b..dc074406014 100644 --- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp +++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp @@ -1164,9 +1164,12 @@ Value *LibCallSimplifier::optimizePow(CallInst *CI, IRBuilder<> &B) { LibFunc::fabsl)) { // In -ffast-math, pow(x, 0.5) -> sqrt(x). - if (UnsafeFPMath) + if (CI->hasUnsafeAlgebra()) { + IRBuilder<>::FastMathFlagGuard Guard(B); + B.setFastMathFlags(CI->getFastMathFlags()); return EmitUnaryFloatFnCall(Op1, TLI->getName(LibFunc::sqrt), B, Callee->getAttributes()); + } // Expand pow(x, 0.5) to (x == -infinity ? +infinity : fabs(sqrt(x))). // This is faster than calling pow, and still handles negative zero |
