MIPS: Use SmiTst and TrySmiTag MacroAssembler instructions.

src/mips/builtins-mips.cc

 // Copyright 2012 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 104 matching lines @@
   //  -- sp[...]: constructor arguments
   // -----------------------------------
   Label generic_array_code, one_or_more_arguments, two_or_more_arguments;
 
   // Get the InternalArray function.
   GenerateLoadInternalArrayFunction(masm, a1);
 
   if (FLAG_debug_code) {
     // Initial map for the builtin InternalArray functions should be maps.
     __ lw(a2, FieldMemOperand(a1, JSFunction::kPrototypeOrInitialMapOffset));
-    __ And(t0, a2, Operand(kSmiTagMask));
+    __ SmiTst(a2, t0);
     __ Assert(ne, kUnexpectedInitialMapForInternalArrayFunction,
               t0, Operand(zero_reg));
     __ GetObjectType(a2, a3, t0);
     __ Assert(eq, kUnexpectedInitialMapForInternalArrayFunction,
               t0, Operand(MAP_TYPE));
   }
 
   // Run the native code for the InternalArray function called as a normal
   // function.
   // Tail call a stub.
   InternalArrayConstructorStub stub(masm->isolate());
   __ TailCallStub(&stub);
 }
 
 
 void Builtins::Generate_ArrayCode(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- a0     : number of arguments
   //  -- ra     : return address
   //  -- sp[...]: constructor arguments
   // -----------------------------------
   Label generic_array_code;
 
   // Get the Array function.
   GenerateLoadArrayFunction(masm, a1);
 
   if (FLAG_debug_code) {
     // Initial map for the builtin Array functions should be maps.
     __ lw(a2, FieldMemOperand(a1, JSFunction::kPrototypeOrInitialMapOffset));
-    __ And(t0, a2, Operand(kSmiTagMask));
+    __ SmiTst(a2, t0);
     __ Assert(ne, kUnexpectedInitialMapForArrayFunction1,
               t0, Operand(zero_reg));
     __ GetObjectType(a2, a3, t0);
     __ Assert(eq, kUnexpectedInitialMapForArrayFunction2,
               t0, Operand(MAP_TYPE));
   }
 
   // Run the native code for the Array function called as a normal function.
   // Tail call a stub.
   Handle<Object> undefined_sentinel(
@@ skipping 1341 matching lines @@
   __ bind(&dont_adapt_arguments);
   __ Jump(a3);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS