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| author | Lang Hames <lhames@gmail.com> | 2012-02-25 02:01:00 +0000 |
|---|---|---|
| committer | Lang Hames <lhames@gmail.com> | 2012-02-25 02:01:00 +0000 |
| commit | c69cbd0a7431b047dbc4a9758e81bf122926ba0a (patch) | |
| tree | d63e9986ada59a2a1a98fe90400311d20334be9b /lib/CodeGen/PeepholeOptimizer.cpp | |
| parent | ff16eb64f5248df439a7b006f4aefd470606287a (diff) | |
| download | llvm-c69cbd0a7431b047dbc4a9758e81bf122926ba0a.tar.gz llvm-c69cbd0a7431b047dbc4a9758e81bf122926ba0a.tar.bz2 llvm-c69cbd0a7431b047dbc4a9758e81bf122926ba0a.tar.xz | |
Make the peephole optimizer clear kill flags on a vreg if it's about to add new
uses of the vreg, since the old kills may no longer be valid. This was causing
-verify-machineinstrs to complain about uses after kills, and could potentially
have been causing subtle register allocation issues, but I haven't come across a
test case yet.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151425 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/PeepholeOptimizer.cpp')
| -rw-r--r-- | lib/CodeGen/PeepholeOptimizer.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/CodeGen/PeepholeOptimizer.cpp b/lib/CodeGen/PeepholeOptimizer.cpp index 203f2bffb7..9c5c029000 100644 --- a/lib/CodeGen/PeepholeOptimizer.cpp +++ b/lib/CodeGen/PeepholeOptimizer.cpp @@ -237,6 +237,10 @@ OptimizeExtInstr(MachineInstr *MI, MachineBasicBlock *MBB, if (PHIBBs.count(UseMBB)) continue; + // About to add uses of DstReg, clear DstReg's kill flags. + if (!Changed) + MRI->clearKillFlags(DstReg); + unsigned NewVR = MRI->createVirtualRegister(RC); BuildMI(*UseMBB, UseMI, UseMI->getDebugLoc(), TII->get(TargetOpcode::COPY), NewVR) |