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It's not safe to fold (fptrunc (sqrt (fpext x))) to (sqrtf x) if there is another use of sqrt. rdar://9763193

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135058 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2011-07-13 19:08:16 +00:00
parent 59642c2600
commit 93a635c82c
3 changed files with 23 additions and 3 deletions
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3
lib/Transforms/InstCombine/InstCombineCasts.cpp
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@ -1216,7 +1216,8 @@ Instruction *InstCombiner::visitFPTrunc(FPTruncInst &CI) {
CallInst *Call = dyn_cast<CallInst>(CI.getOperand(0));
if (Call && Call->getCalledFunction() &&
Call->getCalledFunction()->getName() == "sqrt" &&
Call->getNumArgOperands() == 1) {
Call->getNumArgOperands() == 1 &&
Call->hasOneUse()) {
CastInst *Arg = dyn_cast<CastInst>(Call->getArgOperand(0));
if (Arg && Arg->getOpcode() == Instruction::FPExt &&
CI.getType()->isFloatTy() &&