diff options
| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2009-08-04 20:09:25 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2009-08-04 20:09:25 +0000 |
| commit | efb8e3e113cbf359d6a838c3b37fedc8305d19bb (patch) | |
| tree | b59d2a13fc2395df49dfa90e074abe586d5e137c /lib | |
| parent | ded2e3b0d02998b3bb99b5089d05fca1e0097868 (diff) | |
Don't tamper with <undef> operands in MachineInstr::addRegisterKilled.
For an undef operand, MO.getReg() is meaningless and we should not use it.
Undef operands should be skipped entirely.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78095 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/CodeGen/MachineInstr.cpp | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp index c29a6e339e..dd2fef7ff0 100644 --- a/lib/CodeGen/MachineInstr.cpp +++ b/lib/CodeGen/MachineInstr.cpp @@ -1030,7 +1030,7 @@ bool MachineInstr::addRegisterKilled(unsigned IncomingReg, SmallVector<unsigned,4> DeadOps; for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { MachineOperand &MO = getOperand(i); - if (!MO.isReg() || !MO.isUse()) + if (!MO.isReg() || !MO.isUse() || MO.isUndef()) continue; unsigned Reg = MO.getReg(); if (!Reg) @@ -1041,8 +1041,6 @@ bool MachineInstr::addRegisterKilled(unsigned IncomingReg, if (MO.isKill()) // The register is already marked kill. return true; - // This operand can no longer be undef since Reg is live-in. - MO.setIsUndef(false); if (isPhysReg && isRegTiedToDefOperand(i)) // Two-address uses of physregs must not be marked kill. return true; |