Slightly improved register assignment for %_IsObject on IA32 and ARM.

src/ia32/lithium-ia32.cc

 // Copyright 2011 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 1078 matching lines @@
         UseRegisterAtStart(compare->value()));
   } else if (v->IsIsNull()) {
     HIsNull* compare = HIsNull::cast(v);
     ASSERT(compare->value()->representation().IsTagged());
     // We only need a temp register for non-strict compare.
     LOperand* temp = compare->is_strict() ? NULL : TempRegister();
     return new LIsNullAndBranch(UseRegisterAtStart(compare->value()), temp);
   } else if (v->IsIsObject()) {
     HIsObject* compare = HIsObject::cast(v);
     ASSERT(compare->value()->representation().IsTagged());
-    LOperand* temp1 = TempRegister();
-    LOperand* temp2 = TempRegister();
-    return new LIsObjectAndBranch(UseRegister(compare->value()),
-                                  temp1,
-                                  temp2);
+    LOperand* temp = TempRegister();
+    return new LIsObjectAndBranch(UseRegister(compare->value()), temp);
   } else if (v->IsCompareObjectEq()) {
     HCompareObjectEq* compare = HCompareObjectEq::cast(v);
     return new LCmpObjectEqAndBranch(UseRegisterAtStart(compare->left()),
                                      UseRegisterAtStart(compare->right()));
   } else if (v->IsCompareConstantEq()) {
     HCompareConstantEq* compare = HCompareConstantEq::cast(v);
     return new LCmpConstantEqAndBranch(UseRegisterAtStart(compare->value()));
   } else if (v->IsTypeofIs()) {
     HTypeofIs* typeof_is = HTypeofIs::cast(v);
     return new LTypeofIsAndBranch(UseTempRegister(typeof_is->value()));
@@ skipping 425 matching lines @@
   LOperand* value = UseRegisterAtStart(instr->value());
 
   return DefineAsRegister(new LIsNull(value));
 }
 
 
 LInstruction* LChunkBuilder::DoIsObject(HIsObject* instr) {
   ASSERT(instr->value()->representation().IsTagged());
   LOperand* value = UseRegister(instr->value());
 
-  return DefineAsRegister(new LIsObject(value, TempRegister()));
+  return DefineAsRegister(new LIsObject(value));
 }
 
 
 LInstruction* LChunkBuilder::DoIsSmi(HIsSmi* instr) {
   ASSERT(instr->value()->representation().IsTagged());
   LOperand* value = UseAtStart(instr->value());
 
   return DefineAsRegister(new LIsSmi(value));
 }
 
@@ skipping 726 matching lines @@
   LOperand* key = UseOrConstantAtStart(instr->key());
   LOperand* object = UseOrConstantAtStart(instr->object());
   LIn* result = new LIn(key, object);
   return MarkAsCall(DefineFixed(result, eax), instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32