[turbofan] Remove the FloatXXSubPreserveNan operators.

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/ast/scopes.h"
 #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"
@@ skipping 1246 matching lines @@
       break;
     case kMips64AddS:
       // TODO(plind): add special case: combine mult & add.
       __ add_s(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
                i.InputDoubleRegister(1));
       break;
     case kMips64SubS:
       __ sub_s(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
                i.InputDoubleRegister(1));
       break;
-    case kMips64SubPreserveNanS:
-      __ SubNanPreservePayloadAndSign_s(i.OutputDoubleRegister(),
-                                        i.InputDoubleRegister(0),
-                                        i.InputDoubleRegister(1));
-      break;
     case kMips64MulS:
       // TODO(plind): add special case: right op is -1.0, see arm port.
       __ mul_s(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
                i.InputDoubleRegister(1));
       break;
     case kMips64DivS:
       __ div_s(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
                i.InputDoubleRegister(1));
       break;
     case kMips64ModS: {
@@ skipping 33 matching lines @@
       break;
     case kMips64AddD:
       // TODO(plind): add special case: combine mult & add.
       __ add_d(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
                i.InputDoubleRegister(1));
       break;
     case kMips64SubD:
       __ sub_d(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
                i.InputDoubleRegister(1));
       break;
-    case kMips64SubPreserveNanD:
-      __ SubNanPreservePayloadAndSign_d(i.OutputDoubleRegister(),
-                                        i.InputDoubleRegister(0),
-                                        i.InputDoubleRegister(1));
-      break;
     case kMips64MulD:
       // TODO(plind): add special case: right op is -1.0, see arm port.
       __ mul_d(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
                i.InputDoubleRegister(1));
       break;
     case kMips64DivD:
       __ div_d(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
                i.InputDoubleRegister(1));
       break;
     case kMips64ModD: {
@@ skipping 1126 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8