Add a utility function for conservatively clearing kill flags, and make
use of it in MachineCSE.
llvm-svn: 103726
diff --git a/llvm/lib/CodeGen/MachineCSE.cpp b/llvm/lib/CodeGen/MachineCSE.cpp
index 84c3d71..cfe5040 100644
--- a/llvm/lib/CodeGen/MachineCSE.cpp
+++ b/llvm/lib/CodeGen/MachineCSE.cpp
@@ -112,6 +112,7 @@
DEBUG(dbgs() << "Coalescing: " << *DefMI);
DEBUG(dbgs() << "*** to: " << *MI);
MO.setReg(SrcReg);
+ MRI->clearKillFlags(SrcReg);
if (NewRC != SRC)
MRI->setRegClass(SrcReg, NewRC);
DefMI->eraseFromParent();
@@ -365,8 +366,10 @@
// Actually perform the elimination.
if (DoCSE) {
- for (unsigned i = 0, e = CSEPairs.size(); i != e; ++i)
+ for (unsigned i = 0, e = CSEPairs.size(); i != e; ++i) {
MRI->replaceRegWith(CSEPairs[i].first, CSEPairs[i].second);
+ MRI->clearKillFlags(CSEPairs[i].second);
+ }
MI->eraseFromParent();
++NumCSEs;
} else {