AArch64LoadStoreOptimizer: Correctly clear kill flags
When promoting the Load of a Store-Load pair to a COPY all kill flags
between the store and the load need to be cleared.
rdar://30402435
Differential Revision: https://reviews.llvm.org/D30110
llvm-svn: 295512
diff --git a/llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp b/llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
index 443a14f..8ec7262 100644
--- a/llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
+++ b/llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
@@ -866,9 +866,11 @@
.addImm(Imms);
}
}
- StoreI->clearRegisterKills(StRt, TRI);
- (void)BitExtMI;
+ // Clear kill flags between store and load.
+ for (MachineInstr &MI : make_range(StoreI->getIterator(),
+ BitExtMI->getIterator()))
+ MI.clearRegisterKills(StRt, TRI);
DEBUG(dbgs() << "Promoting load by replacing :\n ");
DEBUG(StoreI->print(dbgs()));