[builtins] Migrate Math.log to TurboFan.

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/frames-arm64.h"
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
@@ skipping 1224 matching lines @@
       break;
     case kArm64Float64Min:
       // (a < b) ? a : b
       __ Fcmp(i.InputDoubleRegister(0), i.InputDoubleRegister(1));
       __ Fcsel(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
                i.InputDoubleRegister(1), lo);
       break;
     case kArm64Float64Abs:
       __ Fabs(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;
+    case kArm64Float64Log: {
+      // TODO(dcarney): implement directly. See note in lithium-codegen-arm64.cc

[Yang, 2016/06/03 09:41:43]

TODO(dcarney)....?

[Benedikt Meurer, 2016/06/03 09:45:03]

Copy and paste :-)

+      FrameScope scope(masm(), StackFrame::MANUAL);
+      DCHECK(d0.is(i.InputDoubleRegister(0)));
+      DCHECK(d0.is(i.OutputDoubleRegister()));
+      // TODO(dcarney): make sure this saves all relevant registers.
+      __ CallCFunction(ExternalReference::math_log_double_function(isolate()),
+                       0, 1);
+      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:
@@ skipping 662 matching lines @@
       padding_size -= kInstructionSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8