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

3 files changed, 3 insertions, 9 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;
         }
       }
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index c281cd1149..7cf282c25c 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -327,7 +327,7 @@ void MachineOperand::print(raw_ostream &OS, const TargetMachine *TM) const {
     OS << '>';
     break;
   case MachineOperand::MO_RegisterMask:
-    OS << (getRegMask() ? "<regmask>" : "<regmask:null>");
+    OS << "<regmask>";
     break;
   case MachineOperand::MO_Metadata:
     OS << '<';
diff --git a/lib/CodeGen/MachineLICM.cpp b/lib/CodeGen/MachineLICM.cpp
index 49a109e252..9b058c3416 100644
--- a/lib/CodeGen/MachineLICM.cpp
+++ b/lib/CodeGen/MachineLICM.cpp
@@ -417,10 +417,7 @@ void MachineLICM::ProcessMI(MachineInstr *MI,
     // We can't hoist an instruction defining a physreg that is clobbered in
     // the loop.
     if (MO.isRegMask()) {
-      if (const uint32_t *Mask = MO.getRegMask())
-        PhysRegClobbers.setBitsNotInMask(Mask);
-      else
-        PhysRegClobbers.set();
+      PhysRegClobbers.setBitsNotInMask(MO.getRegMask());
       continue;
     }