Fix a couple of places where changes are made but not tracked.

llvm-svn: 129287

1 files changed, 6 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/MachineCSE.cpp b/llvm/lib/CodeGen/MachineCSE.cpp
index 07a7d27b019..f97ccf65790 100644
--- a/llvm/lib/CodeGen/MachineCSE.cpp
+++ b/llvm/lib/CodeGen/MachineCSE.cpp
@@ -365,6 +365,8 @@ bool MachineCSE::ProcessBlock(MachineBasicBlock *MBB) {
     if (!FoundCSE) {
       // Look for trivial copy coalescing opportunities.
       if (PerformTrivialCoalescing(MI, MBB)) {
+        Changed = true;
+
         // After coalescing MI itself may become a copy.
         if (MI->isCopyLike())
           continue;
@@ -379,10 +381,11 @@ bool MachineCSE::ProcessBlock(MachineBasicBlock *MBB) {
       if (NewMI) {
         Commuted = true;
         FoundCSE = VNT.count(NewMI);
-        if (NewMI != MI)
+        if (NewMI != MI) {
           // New instruction. It doesn't need to be kept.
           NewMI->eraseFromParent();
-        else if (!FoundCSE)
+          Changed = true;
+        } else if (!FoundCSE)
           // MI was changed but it didn't help, commute it back!
           (void)TII->commuteInstruction(MI);
       }
@@ -450,6 +453,7 @@ bool MachineCSE::ProcessBlock(MachineBasicBlock *MBB) {
         ++NumPhysCSEs;
       if (Commuted)
         ++NumCommutes;
+      Changed = true;
     } else {
       DEBUG(dbgs() << "*** Not profitable, avoid CSE!\n");
       VNT.insert(MI, CurrVN++);