MIPS: Tag length of FixedArrayBase and smi-array[x] as smi representation

src/mips/lithium-codegen-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 4918 matching lines @@
       __ And(scratch1, scratch1, Operand(HeapNumber::kSignMask));
       DeoptimizeIf(ne, instr->environment(), scratch1, Operand(zero_reg));
       __ bind(&done);
     }
   }
   __ SmiTagCheckOverflow(result_reg, result_reg, scratch1);
   DeoptimizeIf(lt, instr->environment(), scratch1, Operand(zero_reg));
 }
 
 
+void LCodeGen::DoCheckSmiAndReturn(LCheckSmiAndReturn* instr) {
+  LOperand* input = instr->value();
+  __ And(at, ToRegister(input), Operand(kSmiTagMask));
+  DeoptimizeIf(ne, instr->environment(), at, Operand(zero_reg));
+}
+
+
 void LCodeGen::DoCheckSmi(LCheckSmi* instr) {
   LOperand* input = instr->value();
   __ And(at, ToRegister(input), Operand(kSmiTagMask));
   DeoptimizeIf(ne, instr->environment(), at, Operand(zero_reg));
 }
 
 
 void LCodeGen::DoCheckNonSmi(LCheckNonSmi* instr) {
   LOperand* input = instr->value();
   __ And(at, ToRegister(input), Operand(kSmiTagMask));
@@ skipping 790 matching lines @@
   __ Subu(scratch, result, scratch);
   __ lw(result, FieldMemOperand(scratch,
                                 FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal