A64: Add LSubS instruction.

src/a64/lithium-a64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2254 matching lines @@
   ASSERT(instr->right()->representation().IsTagged());
   LOperand* left = UseFixed(instr->left(), x1);
   LOperand* right = UseFixed(instr->right(), x0);
   LStringCompareAndBranch* result =
       new(zone()) LStringCompareAndBranch(left, right);
   return MarkAsCall(result, instr);
 }
 
 
 LInstruction* LChunkBuilder::DoSub(HSub* instr) {
-  // TODO(jbramley): Add smi support.
-  if (instr->representation().IsInteger32()) {
-    ASSERT(instr->left()->representation().IsInteger32());
-    ASSERT(instr->right()->representation().IsInteger32());
-
+  if (instr->representation().IsSmiOrInteger32()) {
+    ASSERT(instr->left()->representation().Equals(instr->representation()));
+    ASSERT(instr->right()->representation().Equals(instr->representation()));
     LOperand *left;
     if (instr->left()->IsConstant() &&
        (HConstant::cast(instr->left())->Integer32Value() == 0)) {
       left = UseConstant(instr->left());
     } else {
       left = UseRegisterAtStart(instr->left());
     }
     LOperand* right = UseRegisterOrConstantAtStart(instr->right());
-    LSubI* sub = new(zone()) LSubI(left, right);
-    LInstruction* result = DefineAsRegister(sub);
+    LInstruction* result = instr->representation().IsSmi() ?
+        DefineAsRegister(new(zone()) LSubS(left, right)) :
+        DefineAsRegister(new(zone()) LSubI(left, right));
     if (instr->CheckFlag(HValue::kCanOverflow)) {
       result = AssignEnvironment(result);
     }
     return result;
   } else if (instr->representation().IsDouble()) {
     return DoArithmeticD(Token::SUB, instr);
   } else {
     return DoArithmeticT(Token::SUB, instr);
   }
 }
@@ skipping 236 matching lines @@
 LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) {
   LOperand* receiver = UseRegister(instr->receiver());
   LOperand* function = UseRegisterAtStart(instr->function());
   LOperand* temp = TempRegister();
   LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function, temp);
   return AssignEnvironment(DefineAsRegister(result));
 }
 
 
 } }  // namespace v8::internal