diff options
Diffstat (limited to 'llvm/lib/Transforms/Utils')
| -rw-r--r-- | llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp index c3e2f3aec00..caae06c4211 100644 --- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp +++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp @@ -40,6 +40,13 @@ static cl::opt<bool> ColdErrorCalls("error-reporting-is-cold", cl::init(true), cl::Hidden, cl::desc("Treat error-reporting calls as cold")); +static cl::opt<bool> + EnableUnsafeFPShrink("enable-double-float-shrink", cl::Hidden, + cl::init(false), + cl::desc("Enable unsafe double to float " + "shrinking for math lib calls")); + + //===----------------------------------------------------------------------===// // Helper Functions //===----------------------------------------------------------------------===// @@ -1989,6 +1996,20 @@ Value *LibCallSimplifier::optimizeCall(CallInst *CI) { IRBuilder<> Builder(CI); bool isCallingConvC = CI->getCallingConv() == llvm::CallingConv::C; + // Command-line parameter overrides function attribute. + if (EnableUnsafeFPShrink.getNumOccurrences() > 0) + UnsafeFPShrink = EnableUnsafeFPShrink; + else if (Callee->hasFnAttribute("unsafe-fp-math")) { + // FIXME: This is the same problem as described in optimizeSqrt(). + // If calls gain access to IR-level FMF, then use that instead of a + // function attribute. + + // Check for unsafe-fp-math = true. + Attribute Attr = Callee->getFnAttribute("unsafe-fp-math"); + if (Attr.getValueAsString() == "true") + UnsafeFPShrink = true; + } + // Next check for intrinsics. if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(CI)) { if (!isCallingConvC) @@ -2182,11 +2203,10 @@ Value *LibCallSimplifier::optimizeCall(CallInst *CI) { } LibCallSimplifier::LibCallSimplifier(const DataLayout *DL, - const TargetLibraryInfo *TLI, - bool UnsafeFPShrink) : + const TargetLibraryInfo *TLI) : DL(DL), TLI(TLI), - UnsafeFPShrink(UnsafeFPShrink) { + UnsafeFPShrink(false) { } void LibCallSimplifier::replaceAllUsesWith(Instruction *I, Value *With) const { |
