Use Rotate*() functions instead of doing this manually.

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 1994 matching lines @@
           break;
         case SRL:
           if (rs_reg == 0) {
             // Regular logical right shift of a word by a fixed number of
             // bits instruction. RS field is always equal to 0.
             *alu_out = (uint32_t)rt_u >> sa;
           } else {
             // Logical right-rotate of a word by a fixed number of bits. This
             // is special case of SRL instruction, added in MIPS32 Release 2.
             // RS field is equal to 00001.
-            *alu_out = ((uint32_t)rt_u >> sa) | ((uint32_t)rt_u << (32 - sa));
+            *alu_out = base::bits::RotateRight32((uint32_t)rt_u, sa);
           }
           break;
         case DSRL:
           *alu_out = rt_u >> sa;
           break;
         case DSRL32:
           *alu_out = rt_u >> sa >> 32;
           break;
         case SRA:
           *alu_out = (int32_t)rt >> sa;
@@ skipping 12 matching lines @@
           break;
         case SRLV:
           if (sa == 0) {
             // Regular logical right-shift of a word by a variable number of
             // bits instruction. SA field is always equal to 0.
             *alu_out = (uint32_t)rt_u >> rs;
           } else {
             // Logical right-rotate of a word by a variable number of bits.
             // This is special case od SRLV instruction, added in MIPS32
             // Release 2. SA field is equal to 00001.
-            *alu_out =
-                ((uint32_t)rt_u >> rs_u) | ((uint32_t)rt_u << (32 - rs_u));
+            *alu_out = base::bits::RotateRight32(((uint32_t)rt_u, rs_u);
           }
           break;
         case DSRLV:
           if (sa == 0) {
             // Regular logical right-shift of a word by a variable number of
             // bits instruction. SA field is always equal to 0.
             *alu_out = rt_u >> rs;
           } else {
             // Logical right-rotate of a word by a variable number of bits.
             // This is special case od SRLV instruction, added in MIPS32
             // Release 2. SA field is equal to 00001.
-            *alu_out = (rt_u >> rs_u) | (rt_u << (32 - rs_u));
+            *alu_out = base::bits::RotateRight32(rt_u, rs_u);
           }
           break;
         case SRAV:
           *alu_out = (int32_t)rt >> rs;
           break;
         case DSRAV:
           *alu_out = rt >> rs;
           break;
         case MFHI:  // MFHI == CLZ on R6.
           if (kArchVariant != kMips64r6) {
@@ skipping 1376 matching lines @@
 }
 
 
 #undef UNSUPPORTED
 
 } }  // namespace v8::internal
 
 #endif  // USE_SIMULATOR
 
 #endif  // V8_TARGET_ARCH_MIPS64