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Reimplement r108639 in InstCombine rather than DAGCombine.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108687 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2010-07-19 08:09:34 +00:00
parent 926f2bb3d8
commit d90290127b
1 changed files with 26 additions and 0 deletions
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26
lib/Transforms/InstCombine/InstCombineCasts.cpp
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@ -1097,6 +1097,32 @@ Instruction *InstCombiner::visitFPTrunc(FPTruncInst &CI) {
break;
}
}
// Fold (fptrunc (sqrt (fpext x))) -> (sqrtf x)
// NOTE: This should be disabled by -fno-builtin-sqrt if we ever support it.
CallInst *Call = dyn_cast<CallInst>(CI.getOperand(0));
if (Call && Call->getCalledFunction() &&
Call->getCalledFunction()->getName() == "sqrt" &&
Call->getNumArgOperands() == 1) {
CastInst *Arg = dyn_cast<CastInst>(Call->getArgOperand(0));
if (Arg && Arg->getOpcode() == Instruction::FPExt &&
CI.getType() == Builder->getFloatTy() &&
Call->getType() == Builder->getDoubleTy() &&
Arg->getType() == Builder->getDoubleTy() &&
Arg->getOperand(0)->getType() == Builder->getFloatTy()) {
Module* M = CI.getParent()->getParent()->getParent();
Constant* SqrtfFunc = M->getOrInsertFunction("sqrtf",
Call->getAttributes(),
Builder->getFloatTy(),
Builder->getFloatTy(),
NULL);
CallInst *ret = CallInst::Create(SqrtfFunc, Arg->getOperand(0),
"sqrtfcall");
ret->setAttributes(Call->getAttributes());
return ret;
}
}
return 0;
}