diff options
| -rw-r--r-- | lib/CodeGen/DeadMachineInstructionElim.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/CodeGen/DeadMachineInstructionElim.cpp b/lib/CodeGen/DeadMachineInstructionElim.cpp index ba135e19f4..aeb0b3ed02 100644 --- a/lib/CodeGen/DeadMachineInstructionElim.cpp +++ b/lib/CodeGen/DeadMachineInstructionElim.cpp @@ -173,6 +173,13 @@ bool DeadMachineInstructionElim::runOnMachineFunction(MachineFunction &MF) { *SubRegs; ++SubRegs) LivePhysRegs.reset(*SubRegs); } + } else if (MO.isRegMask()) { + // Register mask of preserved registers. All clobbers are dead. + if (const uint32_t *Mask = MO.getRegMask()) + LivePhysRegs.clearBitsNotInMask(Mask); + else + LivePhysRegs.reset(); + LivePhysRegs |= ReservedRegs; } } // Record the physreg uses, after the defs, in case a physreg is |