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[SimplifyLibCalls] Erase replaced instructions

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After RAUWing an instruction, also erase it. This makes sure we
don't perform extra InstCombine iterations to clean up the garbage.
This commit is contained in:
Nikita Popov 2020-03-29 19:10:19 +02:00
parent fba73700fd
commit 6583fd399c
1 changed files with 4 additions and 1 deletions
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5
lib/Transforms/Utils/SimplifyLibCalls.cpp
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@ -832,6 +832,7 @@ Value *LibCallSimplifier::optimizeStrStr(CallInst *CI, IRBuilderBase &B) {
B.CreateICmp(Old->getPredicate(), StrNCmp, B.CreateICmp(Old->getPredicate(), StrNCmp,
ConstantInt::getNullValue(StrNCmp->getType()), "cmp"); ConstantInt::getNullValue(StrNCmp->getType()), "cmp");
replaceAllUsesWith(Old, Cmp); replaceAllUsesWith(Old, Cmp);
eraseFromParent(Old);
} }
return CI; return CI;
} }
@ -2170,8 +2171,10 @@ Value *LibCallSimplifier::optimizeSinCosPi(CallInst *CI, IRBuilderBase &B) {
auto replaceTrigInsts = [this](SmallVectorImpl<CallInst *> &Calls, auto replaceTrigInsts = [this](SmallVectorImpl<CallInst *> &Calls,
Value *Res) { Value *Res) {
for (CallInst *C : Calls) for (CallInst *C : Calls) {
replaceAllUsesWith(C, Res); replaceAllUsesWith(C, Res);
eraseFromParent(C);
}
}; };
replaceTrigInsts(SinCalls, Sin); replaceTrigInsts(SinCalls, Sin);