MIPS: Add cvt_d_s to disassembler.

src/mips/disasm-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A Disassembler object is used to disassemble a block of code instruction by
 // instruction. The default implementation of the NameConverter object can be
 // overriden to modify register names or to do symbol lookup on addresses.
 //
 // The example below will disassemble a block of code and print it to stdout.
 //
@@ skipping 537 matching lines @@
               break;
             case C_ULE_D:
               Format(instr, "c.ule.d 'fs, 'ft, 'Cc");
               break;
             default:
               Format(instr, "unknown.cop1.d");
               break;
           }
           break;
         case S:
-          UNIMPLEMENTED_MIPS();
+          switch (instr->FunctionFieldRaw()) {
+            case CVT_D_S:
+              Format(instr, "cvt.d.s 'fd, 'fs");
+              break;
+            default:
+              UNIMPLEMENTED_MIPS();
+          }
           break;
         case W:
           switch (instr->FunctionFieldRaw()) {
             case CVT_S_W:   // Convert word to float (single).
               Format(instr, "cvt.s.w 'fd, 'fs");
               break;
             case CVT_D_W:   // Convert word to double.
               Format(instr, "cvt.d.w 'fd, 'fs");
               break;
             default:
@@ skipping 775 matching lines @@
         prev_pc, *reinterpret_cast<int32_t*>(prev_pc), buffer.start());
   }
 }
 
 
 #undef UNSUPPORTED
 
 }  // namespace disasm
 
 #endif  // V8_TARGET_ARCH_MIPS