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enhance RecursivelyDeleteTriviallyDeadInstructions to make

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PHIs dead if they are single-value.

llvm-svn: 60194
This commit is contained in:
Chris Lattner 2008-11-27 23:18:11 +00:00
parent 8b382de4e0
commit 53ebef9cbb
1 changed files with 9 additions and 0 deletions
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9
lib/Transforms/Utils/Local.cpp
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@ -190,6 +190,15 @@ void llvm::RecursivelyDeleteTriviallyDeadInstructions(Value *V,
while (!Insts.empty()) {
I = *Insts.begin();
Insts.erase(I);
// If this is a PHI node, we may be able to make it dead if we know all the
// input values are the same.
if (PHINode *PN = dyn_cast<PHINode>(I)) {
if (Value *PNV = PN->hasConstantValue())
PN->replaceAllUsesWith(PNV);
}
// Okay, if the instruction is dead, delete it.
if (!isInstructionTriviallyDead(I))
continue;