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| author | dim <dim@FreeBSD.org> | 2011-05-02 19:34:44 +0000 |
|---|---|---|
| committer | dim <dim@FreeBSD.org> | 2011-05-02 19:34:44 +0000 |
| commit | 2b066988909948dc3d53d01760bc2d71d32f3feb (patch) | |
| tree | fc5f365fb9035b2d0c622bbf06c9bbe8627d7279 /lib/CodeGen/MachineCSE.cpp | |
| parent | c80ac9d286b8fcc6d1ee5d76048134cf80aa9edc (diff) | |
| download | FreeBSD-src-2b066988909948dc3d53d01760bc2d71d32f3feb.zip FreeBSD-src-2b066988909948dc3d53d01760bc2d71d32f3feb.tar.gz | |
Vendor import of llvm trunk r130700:
http://llvm.org/svn/llvm-project/llvm/trunk@130700
Diffstat (limited to 'lib/CodeGen/MachineCSE.cpp')
| -rw-r--r-- | lib/CodeGen/MachineCSE.cpp | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/lib/CodeGen/MachineCSE.cpp b/lib/CodeGen/MachineCSE.cpp index 07a7d27..f97ccf6 100644 --- a/lib/CodeGen/MachineCSE.cpp +++ b/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++); |
