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| 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 | 8c139a51259aed287c5e2c16bd10d799a25d43dd (patch) | |
| tree | 5b4d4d2299efa5a47b3a1e23d666932cd5eee2ed /llvm/lib/CodeGen/MachineInstr.cpp | |
| parent | fabfcd8beabdaaf713b5b40b851f999c9cc0da75 (diff) | |
| download | llvm-8c139a51259aed287c5e2c16bd10d799a25d43dd.zip llvm-8c139a51259aed287c5e2c16bd10d799a25d43dd.tar.gz llvm-8c139a51259aed287c5e2c16bd10d799a25d43dd.tar.bz2 | |
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.
llvm-svn: 149069
Diffstat (limited to 'llvm/lib/CodeGen/MachineInstr.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/MachineInstr.cpp | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/MachineInstr.cpp b/llvm/lib/CodeGen/MachineInstr.cpp index 18e9f1a..c281cd1 100644 --- a/llvm/lib/CodeGen/MachineInstr.cpp +++ b/llvm/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) { |