MIPS: Support Smi in CompareIDAndBranch

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 2029 matching lines @@
       // jump to false block label.
       __ BranchF(NULL, chunk_->GetAssemblyLabel(false_block), eq,
                  left_reg, right_reg);
 
       EmitBranchF(true_block, false_block, cond, left_reg, right_reg);
     } else {
       Register cmp_left;
       Operand cmp_right = Operand(0);
 
       if (right->IsConstantOperand()) {
-        cmp_left = ToRegister(left);
-        cmp_right = Operand(ToInteger32(LConstantOperand::cast(right)));
+        int32_t value = ToInteger32(LConstantOperand::cast(right));
+        if (instr->hydrogen_value()->representation().IsSmi()) {
+          cmp_left = ToRegister(left);
+          cmp_right = Operand(Smi::FromInt(value));
+        } else {
+          cmp_left = ToRegister(left);
+          cmp_right = Operand(value);
+        }
       } else if (left->IsConstantOperand()) {
-        cmp_left = ToRegister(right);
-        cmp_right = Operand(ToInteger32(LConstantOperand::cast(left)));
+        int32_t value = ToInteger32(LConstantOperand::cast(left));
+        if (instr->hydrogen_value()->representation().IsSmi()) {
+           cmp_left = ToRegister(right);
+           cmp_right = Operand(Smi::FromInt(value));
+        } else {
+          cmp_left = ToRegister(right);
+          cmp_right = Operand(value);
+        }
         // We transposed the operands. Reverse the condition.
         cond = ReverseCondition(cond);
       } else {
         cmp_left = ToRegister(left);
         cmp_right = Operand(ToRegister(right));
       }
 
       EmitBranch(true_block, false_block, cond, cmp_left, cmp_right);
     }
   }
@@ skipping 3673 matching lines @@
   __ Subu(scratch, result, scratch);
   __ lw(result, FieldMemOperand(scratch,
                                 FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal