Handle register masks in DeadMachineInstructionElim.
Don't track live physregs that are clobbered by a register mask operand.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148588 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/DeadMachineInstructionElim.cpp b/lib/CodeGen/DeadMachineInstructionElim.cpp
index ba135e1..aeb0b3e 100644
--- a/lib/CodeGen/DeadMachineInstructionElim.cpp
+++ b/lib/CodeGen/DeadMachineInstructionElim.cpp
@@ -173,6 +173,13 @@
*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