Fix 'MIPS: [turbofan] Support for %_DoubleHi, %_DoubleLo and %_ConstructDouble.'

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/mips/macro-assembler-mips.h"
 #include "src/scopes.h"
@@ skipping 669 matching lines @@
       break;
     }
     case kMips64TruncUwD: {
       FPURegister scratch = kScratchDoubleReg;
       // TODO(plind): Fix wrong param order of Trunc_uw_d() macro-asm function.
       __ Trunc_uw_d(i.InputDoubleRegister(0), i.OutputRegister(), scratch);
       break;
     }
     case kMips64FmoveLowUwD:
       __ FmoveLow(i.OutputRegister(), i.InputDoubleRegister(0));
-      // remove sign.
-      __ dsll32(i.OutputRegister(), i.OutputRegister(), 0);
-      __ dsrl32(i.OutputRegister(), i.OutputRegister(), 0);
       break;
     case kMips64FmoveLowDUw:
       __ FmoveLow(i.OutputDoubleRegister(), i.InputRegister(1));
       break;
     case kMips64FmoveHighUwD:
       __ FmoveHigh(i.OutputRegister(), i.InputDoubleRegister(0));
       break;
     case kMips64FmoveHighDUw:
       __ FmoveHigh(i.OutputDoubleRegister(), i.InputRegister(1));
       break;
@@ skipping 677 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8