Subzero. Eliminates the use of Variable64On32 as operands in ARM.

src/IceTargetLoweringARM32.h

 //===- subzero/src/IceTargetLoweringARM32.h - ARM32 lowering ----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 262 matching lines @@
   /// all types (integer, floating point, and vectors), as well as moves between
   /// Core and VFP registers. This is not a panacea: you must obey the (weird,
   /// confusing, non-uniform) rules for data moves in ARM.
   void _mov(Variable *Dest, Operand *Src0,
             CondARM32::Cond Pred = CondARM32::AL) {
     // _mov used to be unique in the sense that it would create a temporary
     // automagically if Dest was nullptr. It won't do that anymore, so we keep
     // an assert around just in case there is some untested code path where Dest
     // is nullptr.
     assert(Dest != nullptr);
-    Context.insert(InstARM32Mov::create(Func, Dest, Src0, Pred));
+    auto *Instr = InstARM32Mov::create(Func, Dest, Src0, Pred);
+
+    Context.insert(Instr);
+    if (Instr->isMultiDest()) {
+      // If Instr is multi-dest, then Dest must be a Variable64On32. We add a
+      // fake-def for Instr.DestHi here.
+      assert(llvm::isa<Variable64On32>(Dest));
+      Context.insert(InstFakeDef::create(Func, Instr->getDestHi()));
+    }
   }
   void _mov_redefined(Variable *Dest, Operand *Src0,
                       CondARM32::Cond Pred = CondARM32::AL) {
-    Inst *NewInst = InstARM32Mov::create(Func, Dest, Src0, Pred);
-    NewInst->setDestRedefined();
-    Context.insert(NewInst);
+    auto *Instr = InstARM32Mov::create(Func, Dest, Src0, Pred);
+    Instr->setDestRedefined();
+    Context.insert(Instr);
+    if (Instr->isMultiDest()) {
+      // If Instr is multi-dest, then Dest must be a Variable64On32. We add a
+      // fake-def for Instr.DestHi here.
+      assert(llvm::isa<Variable64On32>(Dest));
+      Context.insert(InstFakeDef::create(Func, Instr->getDestHi()));
+    }
   }
   /// The Operand can only be a 16-bit immediate or a ConstantRelocatable (with
   /// an upper16 relocation).
   void _movt(Variable *Dest, Operand *Src0,
              CondARM32::Cond Pred = CondARM32::AL) {
     Context.insert(InstARM32Movt::create(Func, Dest, Src0, Pred));
   }
   void _movw(Variable *Dest, Operand *Src0,
              CondARM32::Cond Pred = CondARM32::AL) {
     Context.insert(InstARM32Movw::create(Func, Dest, Src0, Pred));
@@ skipping 241 matching lines @@
 
 private:
   ~TargetHeaderARM32() = default;
 
   TargetARM32Features CPUFeatures;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGARM32_H