MIPS: Improve code generation for bounds checks.

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 2073 matching lines @@
           r2 = scratch;
           li(r2, rt);
           sltu(scratch, rs, r2);
           offset = shifted_branch_offset(L, false);
           bne(scratch, zero_reg, offset);
         }
         break;
       case Uless_equal:
         if (rt.imm32_ == 0) {
           offset = shifted_branch_offset(L, false);
-          b(offset);
+          beq(rs, zero_reg, offset);
         } else {
           ASSERT(!scratch.is(rs));
           r2 = scratch;
           li(r2, rt);
           sltu(scratch, r2, rs);
           offset = shifted_branch_offset(L, false);
           beq(scratch, zero_reg, offset);
         }
         break;
       default:
@@ skipping 3669 matching lines @@
   }
   if (ms.shift() > 0) sra(result, result, ms.shift());
   srl(at, dividend, 31);
   Addu(result, result, Operand(at));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS