Subzero: Prototype to make use of RegNumT::No Register more concise

src/IceTargetLoweringMIPS32.cpp

Index: src/IceTargetLoweringMIPS32.cpp
diff --git a/src/IceTargetLoweringMIPS32.cpp b/src/IceTargetLoweringMIPS32.cpp
index e34dd5d86c675ed01d2129c57e1aaa0bb63088f3..3b2ad78d7f4211b146a7f8bd77ba40144702b58c 100644
--- a/src/IceTargetLoweringMIPS32.cpp
+++ b/src/IceTargetLoweringMIPS32.cpp
@@ -360,7 +360,7 @@ Variable *TargetMIPS32::makeReg(Type Type, RegNumT RegNum) {
   // There aren't any 64-bit integer registers for Mips32.
   assert(Type != IceType_i64);
   Variable *Reg = Func->makeVariable(Type);
-  if (RegNum == RegNumT::NoRegister)
+  if (RegNum.hasNoValue())

[Jim Stichnoth, 2016/02/12 18:29:54]

if (RegNum.hasValue()) ...
as in the ARM file

[rkotlerimgtec, 2016/02/12 22:02:01]

Done.

     Reg->setMustHaveReg();
   else
     Reg->setRegNum(RegNum);
@@ -1253,7 +1253,7 @@ Operand *TargetMIPS32::legalize(Operand *From, LegalMask Allowed,
     // Also try the inverse and use MVN if possible.
     // Do a movw/movt to a register.
     Variable *Reg;
-    if (RegNum == RegNumT::NoRegister)
+    if (RegNum.hasNoValue())

[Jim Stichnoth, 2016/02/12 18:29:54]

if (RegNum.hasValue()) ...

[rkotlerimgtec, 2016/02/12 22:02:01]

Done.

       Reg = makeReg(Ty, RegNum);
     else
       Reg = getPhysicalRegister(RegNum);
@@ -1281,7 +1281,7 @@ Operand *TargetMIPS32::legalize(Operand *From, LegalMask Allowed,
     //   register, or
     //   RegNum is required and Var->getRegNum() doesn't match.
     if ((!(Allowed & Legal_Mem) && !MustHaveRegister) ||
-        (RegNum != RegNumT::NoRegister && RegNum != Var->getRegNum())) {
+        (RegNum.hasValue() && RegNum != Var->getRegNum())) {
       From = copyToReg(From, RegNum);
     }
     return From;