diff options
| 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 | 49b4589978ca181537c8ae694ac4c8d58d27a09a (patch) | |
| tree | 4ce239768a2457c5c072f64be5f7889343988370 /lib/CodeGen/MachineCSE.cpp | |
| parent | e1308d86ed2402483aa9d056af531fd773e1121f (diff) | |
| download | llvm-49b4589978ca181537c8ae694ac4c8d58d27a09a.tar.gz llvm-49b4589978ca181537c8ae694ac4c8d58d27a09a.tar.bz2 llvm-49b4589978ca181537c8ae694ac4c8d58d27a09a.tar.xz | |
Add a utility function for conservatively clearing kill flags, and make
use of it in MachineCSE.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103726 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineCSE.cpp')
| -rw-r--r-- | lib/CodeGen/MachineCSE.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/CodeGen/MachineCSE.cpp b/lib/CodeGen/MachineCSE.cpp index 84c3d717f7..cfe50408e6 100644 --- a/lib/CodeGen/MachineCSE.cpp +++ b/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 { |