Uses slt and sltu for signed vs. unsigned comparison by the MIPS assembler.

runtime/vm/intermediate_language_mips.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_MIPS.
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 1008 matching lines @@
       break;
     case kTypedDataUint16ArrayCid:
     case kTwoByteStringCid:
       __ lhu(result, element_address);
       __ SmiTag(result);
       break;
     case kTypedDataInt32ArrayCid: {
         Label* deopt = compiler->AddDeoptStub(deopt_id(), kDeoptInt32Load);
         __ lw(result, element_address);
         // Verify that the signed value in 'result' can fit inside a Smi.
-        __ BranchLess(result, 0xC0000000, deopt);
+        __ BranchSignedLess(result, 0xC0000000, deopt);
         __ SmiTag(result);
       }
       break;
     case kTypedDataUint32ArrayCid: {
         Label* deopt = compiler->AddDeoptStub(deopt_id(), kDeoptUint32Load);
         __ lw(result, element_address);
         // Verify that the unsigned value in 'result' can fit inside a Smi.
         __ LoadImmediate(TMP1, 0xC0000000);
         __ and_(CMPRES, result, TMP1);
         __ bne(CMPRES, ZR, deopt);
@@ skipping 1652 matching lines @@
                          &label,
                          PcDescriptors::kOther,
                          locs());
   __ Drop(2);  // Discard type arguments and receiver.
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS