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[AArch64] Add early exit to promoteLoadFromStore.

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There should be at most a single kill flag for the
promoted operand between the store/load pair.
Discussed in https://reviews.llvm.org/D34402.

llvm-svn: 305889
This commit is contained in:
Florian Hahn 2017-06-21 09:51:52 +00:00
parent d269a6e090
commit 355b94d060
1 changed files with 4 additions and 1 deletions
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5
lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
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@ -877,7 +877,10 @@ AArch64LoadStoreOpt::promoteLoadFromStore(MachineBasicBlock::iterator LoadI,
// Clear kill flags between store and load.
for (MachineInstr &MI : make_range(StoreI->getIterator(),
BitExtMI->getIterator()))
MI.clearRegisterKills(StRt, TRI);
if (MI.killsRegister(StRt, TRI)) {
MI.clearRegisterKills(StRt, TRI);
break;
}
DEBUG(dbgs() << "Promoting load by replacing :\n ");
DEBUG(StoreI->print(dbgs()));