[turbofan][arm64] Match fneg for -0.0 - x pattern.

src/compiler/arm64/code-generator-arm64.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/arm64/macro-assembler-arm64.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 671 matching lines @@
       // TODO(dcarney): implement directly. See note in lithium-codegen-arm64.cc
       FrameScope scope(masm(), StackFrame::MANUAL);
       DCHECK(d0.is(i.InputDoubleRegister(0)));
       DCHECK(d1.is(i.InputDoubleRegister(1)));
       DCHECK(d0.is(i.OutputDoubleRegister()));
       // TODO(dcarney): make sure this saves all relevant registers.
       __ CallCFunction(ExternalReference::mod_two_doubles_operation(isolate()),
                        0, 2);
       break;
     }
+    case kArm64Float64Neg:
+      __ Fneg(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
+      break;
     case kArm64Float64Sqrt:
       __ Fsqrt(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;
     case kArm64Float32ToFloat64:
       __ Fcvt(i.OutputDoubleRegister(), i.InputDoubleRegister(0).S());
       break;
     case kArm64Float64ToFloat32:
       __ Fcvt(i.OutputDoubleRegister().S(), i.InputDoubleRegister(0));
       break;
     case kArm64Float64ToInt32:
@@ skipping 517 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8