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Handle register masks in DeadMachineInstructionElim. 

Don't track live physregs that are clobbered by a register mask operand.

llvm-svn: 148588
This commit is contained in:
Jakob Stoklund Olesen 2012-01-20 22:27:09 +00:00
parent 9139892728
commit 58614f2f5a
1 changed files with 7 additions and 0 deletions
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7
llvm/lib/CodeGen/DeadMachineInstructionElim.cpp
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@ -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