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| author | Dan Gohman <gohman@apple.com> | 2010-05-13 19:24:00 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2010-05-13 19:24:00 +0000 |
| commit | 7767d2747b06725697036bb4cd9a2ea95b92684c (patch) | |
| tree | e95b68c00150c6371f9abaf443757b8f3d890eef /llvm/lib/CodeGen/MachineCSE.cpp | |
| parent | 5b510c14742650615c9a3129a97fb4a634c1f77a (diff) | |
| download | bcm5719-llvm-7767d2747b06725697036bb4cd9a2ea95b92684c.tar.gz bcm5719-llvm-7767d2747b06725697036bb4cd9a2ea95b92684c.zip | |
Add a utility function for conservatively clearing kill flags, and make
use of it in MachineCSE.
llvm-svn: 103726
Diffstat (limited to 'llvm/lib/CodeGen/MachineCSE.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/MachineCSE.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/MachineCSE.cpp b/llvm/lib/CodeGen/MachineCSE.cpp index 84c3d717f7f..cfe50408e6e 100644 --- a/llvm/lib/CodeGen/MachineCSE.cpp +++ b/llvm/lib/CodeGen/MachineCSE.cpp @@ -112,6 +112,7 @@ bool MachineCSE::PerformTrivialCoalescing(MachineInstr *MI, 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 @@ bool MachineCSE::ProcessBlock(MachineBasicBlock *MBB) { // 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 { |
