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Use RecursivelyDeleteTriviallyDeadInstructions in EliminateIVComparisons,

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instead of deleting just the user. This makes it more consistent with
other code in IndVarSimplify, and theoretically can eliminate more users
earlier.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101027 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-04-12 07:29:15 +00:00
parent 09010a30fd
commit dd842e34c8
1 changed files with 12 additions and 3 deletions
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15
lib/Transforms/Scalar/IndVarSimplify.cpp
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@ -338,9 +338,11 @@ void IndVarSimplify::RewriteNonIntegerIVs(Loop *L) {
} }
void IndVarSimplify::EliminateIVComparisons() { void IndVarSimplify::EliminateIVComparisons() {
SmallVector<WeakVH, 16> DeadInsts;
// Look for ICmp users. // Look for ICmp users.
for (IVUsers::iterator I = IU->begin(), E = IU->end(); I != E;) { for (IVUsers::iterator I = IU->begin(), E = IU->end(); I != E; ++I) {
IVStrideUse &UI = *I++; IVStrideUse &UI = *I;
ICmpInst *ICmp = dyn_cast<ICmpInst>(UI.getUser()); ICmpInst *ICmp = dyn_cast<ICmpInst>(UI.getUser());
if (!ICmp) continue; if (!ICmp) continue;
@ -367,8 +369,15 @@ void IndVarSimplify::EliminateIVComparisons() {
continue; continue;
DEBUG(dbgs() << "INDVARS: Eliminated comparison: " << *ICmp << '\n'); DEBUG(dbgs() << "INDVARS: Eliminated comparison: " << *ICmp << '\n');
ICmp->eraseFromParent(); DeadInsts.push_back(ICmp);
} }
// Now that we're done iterating through lists, clean up any instructions
// which are now dead.
while (!DeadInsts.empty())
if (Instruction *Inst =
dyn_cast_or_null<Instruction>(DeadInsts.pop_back_val()))
RecursivelyDeleteTriviallyDeadInstructions(Inst);
} }
bool IndVarSimplify::runOnLoop(Loop *L, LPPassManager &LPM) { bool IndVarSimplify::runOnLoop(Loop *L, LPPassManager &LPM) {