diff options
| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-01-26 17:52:15 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-01-26 17:52:15 +0000 |
| commit | 1a96c914315b0286d84c507d696484e2c95875a4 (patch) | |
| tree | 58b1f0a6bb6afe302f820c7970a4e6fe1cb5d1b7 /lib/CodeGen/MachineInstr.cpp | |
| parent | ef4d3ebe2a36ebfd9370e1efbe74dff13f64c40f (diff) | |
Clear kill flags before propagating a copy.
The live range of the source register may be extended when a redundant
copy is eliminated. Make sure any kill flags between the two copies are
cleared.
This fixes PR11765.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149069 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineInstr.cpp')
| -rw-r--r-- | lib/CodeGen/MachineInstr.cpp | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp index 18e9f1a855..c281cd1149 100644 --- a/lib/CodeGen/MachineInstr.cpp +++ b/lib/CodeGen/MachineInstr.cpp @@ -1707,6 +1707,20 @@ bool MachineInstr::addRegisterKilled(unsigned IncomingReg, return Found; } +void MachineInstr::clearRegisterKills(unsigned Reg, + const TargetRegisterInfo *RegInfo) { + if (!TargetRegisterInfo::isPhysicalRegister(Reg)) + RegInfo = 0; + for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { + MachineOperand &MO = getOperand(i); + if (!MO.isReg() || !MO.isUse() || !MO.isKill()) + continue; + unsigned OpReg = MO.getReg(); + if (OpReg == Reg || (RegInfo && RegInfo->isSuperRegister(Reg, OpReg))) + MO.setIsKill(false); + } +} + bool MachineInstr::addRegisterDead(unsigned IncomingReg, const TargetRegisterInfo *RegInfo, bool AddIfNotFound) { |