MIPS: Enable logical shift right and bitwise And matching to Ext, Dext.

src/compiler/mips/code-generator-mips.cc

 // Copyright 2014 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 "src/compiler/code-generator.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/osr.h"
 #include "src/mips/macro-assembler-mips.h"
@@ skipping 645 matching lines @@
       }
       break;
     case kMipsSar:
       if (instr->InputAt(1)->IsRegister()) {
         __ srav(i.OutputRegister(), i.InputRegister(0), i.InputRegister(1));
       } else {
         int32_t imm = i.InputOperand(1).immediate();
         __ sra(i.OutputRegister(), i.InputRegister(0), imm);
       }
       break;
+    case kMipsExt:
+      __ Ext(i.OutputRegister(), i.InputRegister(0), i.InputInt8(1),
+             i.InputInt8(2));
+      break;
     case kMipsRor:
       __ Ror(i.OutputRegister(), i.InputRegister(0), i.InputOperand(1));
       break;
     case kMipsTst:
       // Pseudo-instruction used for tst/branch. No opcode emitted here.
       break;
     case kMipsCmp:
       // Pseudo-instruction used for cmp/branch. No opcode emitted here.
       break;
     case kMipsMov:
@@ skipping 900 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8