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Make sure the instruction combiner doesn't lose track of instructions

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when replacing them, missing the opportunity to do simplifications

llvm-svn: 13308
This commit is contained in:
Chris Lattner 2004-05-01 23:19:52 +00:00
parent 911e21e8ca
commit f5a5668cf6
1 changed files with 6 additions and 3 deletions
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9
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -2934,9 +2934,8 @@ bool InstCombiner::runOnFunction(Function &F) {
bool Changed = false; bool Changed = false;
TD = &getAnalysis<TargetData>(); TD = &getAnalysis<TargetData>();
for (inst_iterator i = inst_begin(F), e = inst_end(F); i != e; ++i) { for (inst_iterator i = inst_begin(F), e = inst_end(F); i != e; ++i)
WorkList.push_back(&*i); WorkList.push_back(&*i);
}
while (!WorkList.empty()) { while (!WorkList.empty()) {
@ -2998,6 +2997,10 @@ bool InstCombiner::runOnFunction(Function &F) {
BasicBlock *InstParent = I->getParent(); BasicBlock *InstParent = I->getParent();
InstParent->getInstList().insert(I, Result); InstParent->getInstList().insert(I, Result);
for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
if (Instruction *OpI = dyn_cast<Instruction>(I->getOperand(i)))
WorkList.push_back(OpI);
// Everything uses the new instruction now... // Everything uses the new instruction now...
I->replaceAllUsesWith(Result); I->replaceAllUsesWith(Result);