[builtins] Migrate Math.log to TurboFan.

src/compiler/x64/code-generator-x64.cc

 // Copyright 2013 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/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 985 matching lines @@
         __ Popcntq(i.OutputRegister(), i.InputOperand(0));
       }
       break;
     case kX64Popcnt32:
       if (instr->InputAt(0)->IsRegister()) {
         __ Popcntl(i.OutputRegister(), i.InputRegister(0));
       } else {
         __ Popcntl(i.OutputRegister(), i.InputOperand(0));
       }
       break;
+    case kX87Float64Log:
+      __ subq(rsp, Immediate(kDoubleSize));
+      __ Movsd(Operand(rsp, 0), i.InputDoubleRegister(0));
+      __ fldln2();
+      __ fld_d(Operand(rsp, 0));
+      __ fyl2x();
+      __ fstp_d(Operand(rsp, 0));
+      __ Movsd(i.OutputDoubleRegister(), Operand(rsp, 0));
+      __ addq(rsp, Immediate(kDoubleSize));
+      break;
     case kSSEFloat32Cmp:
       ASSEMBLE_SSE_BINOP(Ucomiss);
       break;
     case kSSEFloat32Add:
       ASSEMBLE_SSE_BINOP(addss);
       break;
     case kSSEFloat32Sub:
       ASSEMBLE_SSE_BINOP(subss);
       break;
     case kSSEFloat32Mul:
@@ skipping 1293 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8