Require non-NULL register masks.

It doesn't seem worthwhile to give meaning to a NULL register mask
pointer. It complicates all the code using register mask operands.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149646 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 4 deletions

diff --git a/lib/CodeGen/DeadMachineInstructionElim.cpp b/lib/CodeGen/DeadMachineInstructionElim.cpp
index aeb0b3ed02..020b64d883 100644
--- a/lib/CodeGen/DeadMachineInstructionElim.cpp
+++ b/lib/CodeGen/DeadMachineInstructionElim.cpp
@@ -175,10 +175,7 @@ bool DeadMachineInstructionElim::runOnMachineFunction(MachineFunction &MF) {
           }
         } 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.clearBitsNotInMask(MO.getRegMask());
           LivePhysRegs |= ReservedRegs;
         }
       }