MIPS64: Fix TruncatingDiv.

src/mips64/simulator-mips64.cc

 // Copyright 2011 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.
 
 #include <limits.h>
 #include <stdarg.h>
 #include <stdlib.h>
 #include <cmath>
 
 #include "src/v8.h"
@@ skipping 2067 matching lines @@
           }
           break;
         case MFLO:
           *alu_out = get_register(LO);
           break;
         case MULT:  // MULT == D_MUL_MUH.
           // TODO(plind) - Unify MULT/DMULT with single set of 64-bit HI/Lo
           // regs.
           // TODO(plind) - make the 32-bit MULT ops conform to spec regarding
           //   checking of 32-bit input values, and un-define operations of HW.
-          *i64hilo = static_cast<int64_t>((int32_t)rs) *
-              static_cast<int64_t>((int32_t)rt);
+          *i64hilo = rs * rt;
           break;
         case MULTU:
           *u64hilo = static_cast<uint64_t>(rs_u) * static_cast<uint64_t>(rt_u);
           break;
         case DMULT:  // DMULT == D_MUL_MUH.
           if (kArchVariant != kMips64r6) {
             *i128resultH = MultiplyHighSigned(rs, rt);
             *i128resultL = rs * rt;
           } else {
             switch (instr->SaValue()) {
@@ skipping 1337 matching lines @@
 }
 
 
 #undef UNSUPPORTED
 
 } }  // namespace v8::internal
 
 #endif  // USE_SIMULATOR
 
 #endif  // V8_TARGET_ARCH_MIPS64