MIPS: Use SmiTst and TrySmiTag MacroAssembler instructions.

src/mips/macro-assembler-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 4825 matching lines @@
     STATIC_ASSERT(kSmiTag == 0);
     andi(at, object, kSmiTagMask);
     Check(eq, kOperandIsASmi, at, Operand(zero_reg));
   }
 }
 
 
 void MacroAssembler::AssertString(Register object) {
   if (emit_debug_code()) {
     STATIC_ASSERT(kSmiTag == 0);
-    And(t0, object, Operand(kSmiTagMask));
+    SmiTst(object, t0);
     Check(ne, kOperandIsASmiAndNotAString, t0, Operand(zero_reg));
     push(object);
     lw(object, FieldMemOperand(object, HeapObject::kMapOffset));
     lbu(object, FieldMemOperand(object, Map::kInstanceTypeOffset));
     Check(lo, kOperandIsNotAString, object, Operand(FIRST_NONSTRING_TYPE));
     pop(object);
   }
 }
 
 
 void MacroAssembler::AssertName(Register object) {
   if (emit_debug_code()) {
     STATIC_ASSERT(kSmiTag == 0);
-    And(t0, object, Operand(kSmiTagMask));
+    SmiTst(object, t0);
     Check(ne, kOperandIsASmiAndNotAName, t0, Operand(zero_reg));
     push(object);
     lw(object, FieldMemOperand(object, HeapObject::kMapOffset));
     lbu(object, FieldMemOperand(object, Map::kInstanceTypeOffset));
     Check(le, kOperandIsNotAName, object, Operand(LAST_NAME_TYPE));
     pop(object);
   }
 }
 
 
@@ skipping 179 matching lines @@
   return stack_passed_words;
 }
 
 
 void MacroAssembler::EmitSeqStringSetCharCheck(Register string,
                                                Register index,
                                                Register value,
                                                Register scratch,
                                                uint32_t encoding_mask) {
   Label is_object;
-  And(at, string, Operand(kSmiTagMask));
+  SmiTst(string, at);
   ThrowIf(eq, kNonObject, at, Operand(zero_reg));
 
   lw(at, FieldMemOperand(string, HeapObject::kMapOffset));
   lbu(at, FieldMemOperand(at, Map::kInstanceTypeOffset));
 
   andi(at, at, kStringRepresentationMask | kStringEncodingMask);
   li(scratch, Operand(encoding_mask));
   ThrowIf(ne, kUnexpectedStringType, at, Operand(scratch));
 
   // The index is assumed to be untagged coming in, tag it to compare with the
   // string length without using a temp register, it is restored at the end of
   // this function.
   Label index_tag_ok, index_tag_bad;
-  // On ARM TrySmiTag is used here.
-  AdduAndCheckForOverflow(index, index, index, scratch);
-  BranchOnOverflow(&index_tag_bad, scratch);
+  TrySmiTag(index, scratch, &index_tag_bad);
   Branch(&index_tag_ok);
   bind(&index_tag_bad);
   Throw(kIndexIsTooLarge);
   bind(&index_tag_ok);
 
   lw(at, FieldMemOperand(string, String::kLengthOffset));
   ThrowIf(ge, kIndexIsTooLarge, index, Operand(at));
 
   li(at, Operand(Smi::FromInt(0)));
   ThrowIf(lt, kIndexIsNegative, index, Operand(at));
@@ skipping 662 matching lines @@
        opcode == BGTZL);
   opcode = (cond == eq) ? BEQ : BNE;
   instr = (instr & ~kOpcodeMask) | opcode;
   masm_.emit(instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS