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Allow PeepholeOptimizer to fold a few more cases

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The condition for clearing the folding candidate list was clamped together
with the "uninteresting instruction" condition. This is too conservative,
e.g. we don't need to clear the list when encountering an IMPLICIT_DEF.

Differential Revision: http://reviews.llvm.org/D11591

llvm-svn: 244577
This commit is contained in:
Michael Kuperstein
2015-08-11 08:19:43 +00:00
parent c186ac7aea
commit 82814f63c0
3 changed files with 14 additions and 18 deletions
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9
llvm/lib/CodeGen/PeepholeOptimizer.cpp
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@@ -1236,14 +1236,13 @@ bool PeepholeOptimizer::runOnMachineFunction(MachineFunction &MF) {
// If there exists an instruction which belongs to the following
// categories, we will discard the load candidates.
if (MI->mayStore() || MI->isCall() || MI->hasUnmodeledSideEffects())
FoldAsLoadDefCandidates.clear();
if (MI->isPosition() || MI->isPHI() || MI->isImplicitDef() ||
MI->isKill() || MI->isInlineAsm() ||
MI->hasUnmodeledSideEffects()) {
FoldAsLoadDefCandidates.clear();
MI->hasUnmodeledSideEffects())
continue;
}
if (MI->mayStore() || MI->isCall())
FoldAsLoadDefCandidates.clear();
if ((isUncoalescableCopy(*MI) &&
optimizeUncoalescableCopy(MI, LocalMIs)) ||