MIPS64: [turbofan] Combine untagging shifts with Mul, Div and Mod.

src/compiler/mips64/code-generator-mips64.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 600 matching lines @@
       break;
     case kMips64Mul:
       __ Mul(i.OutputRegister(), i.InputRegister(0), i.InputOperand(1));
       break;
     case kMips64MulHigh:
       __ Mulh(i.OutputRegister(), i.InputRegister(0), i.InputOperand(1));
       break;
     case kMips64MulHighU:
       __ Mulhu(i.OutputRegister(), i.InputRegister(0), i.InputOperand(1));
       break;
+    case kMips64DMulHigh:
+      __ Dmulh(i.OutputRegister(), i.InputRegister(0), i.InputOperand(1));
+      break;
     case kMips64Div:
       __ Div(i.OutputRegister(), i.InputRegister(0), i.InputOperand(1));
       break;
     case kMips64DivU:
       __ Divu(i.OutputRegister(), i.InputRegister(0), i.InputOperand(1));
       break;
     case kMips64Mod:
       __ Mod(i.OutputRegister(), i.InputRegister(0), i.InputOperand(1));
       break;
     case kMips64ModU:
@@ skipping 1057 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8