[Subzero][MIPS32] Implement bitcast operation for both 32-bit and 64-bit operands

src/IceInstMIPS32.h

Index: src/IceInstMIPS32.h
diff --git a/src/IceInstMIPS32.h b/src/IceInstMIPS32.h
index 05f9bdf35120bd55ad7256fb73c2f06aa109ff68..583a09e8e5af3da526b1e1c0e3760416ea0e4eb1 100644
--- a/src/IceInstMIPS32.h
+++ b/src/IceInstMIPS32.h
@@ -1200,9 +1200,12 @@ class InstMIPS32Mov final : public InstMIPS32 {
   InstMIPS32Mov &operator=(const InstMIPS32Mov &) = delete;
 
 public:
-  static InstMIPS32Mov *create(Cfg *Func, Variable *Dest, Operand *Src) {
-    return new (Func->allocate<InstMIPS32Mov>()) InstMIPS32Mov(Func, Dest, Src);
+  static InstMIPS32Mov *create(Cfg *Func, Variable *Dest, Operand *Src,
+                               Operand *Src2) {
+    return new (Func->allocate<InstMIPS32Mov>())
+        InstMIPS32Mov(Func, Dest, Src, Src2);
   }
+
   bool isRedundantAssign() const override {
     return !isMultiDest() && !isMultiSource() &&
            checkForRedundantAssign(getDest(), getSrc(0));
@@ -1213,17 +1216,14 @@ public:
   void dump(const Cfg *Func) const override;
   static bool classof(const Inst *Inst) { return isClassof(Inst, Mov); }
 
-  bool isMultiDest() const { return DestHi != nullptr; }
+  bool isMultiDest() const { return false; }

[Jim Stichnoth, 2016/10/10 17:07:49]

Are these meant to be permanent changes?  (i.e. isMultiDest() and
isMultiSource() always return false)
If so, can you just remove these functions and change their users accordingly?

[sagar.thakur, 2016/10/12 06:07:06]

Yes, a mov instruction will always have single destination and source.
Removed these functions and their uses.

 
-  bool isMultiSource() const {
-    assert(getSrcSize() == 1 || getSrcSize() == 2);
-    return getSrcSize() == 2;
-  }
+  bool isMultiSource() const { return false; }
 
   Variable *getDestHi() const { return DestHi; }
 
 private:
-  InstMIPS32Mov(Cfg *Func, Variable *Dest, Operand *Src);
+  InstMIPS32Mov(Cfg *Func, Variable *Dest, Operand *Src, Operand *Src2);
 
   void emitMultiDestSingleSource(const Cfg *Func) const;
   void emitSingleDestMultiSource(const Cfg *Func) const;