X87: [builtins] Migrate Math.log to TurboFan.

src/compiler/x87/code-generator-x87.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 880 matching lines @@
       } else {
         __ ror_cl(i.OutputOperand());
       }
       break;
     case kX87Lzcnt:
       __ Lzcnt(i.OutputRegister(), i.InputOperand(0));
       break;
     case kX87Popcnt:
       __ Popcnt(i.OutputRegister(), i.InputOperand(0));
       break;
+    case kX87Float64Log:
+      if (FLAG_debug_code && FLAG_enable_slow_asserts) {
+        __ VerifyX87StackDepth(1);
+      }
+      __ X87SetFPUCW(0x027F);
+      __ fstp(0);
+      __ fldln2();
+      __ fld_d(MemOperand(esp, 0));
+      __ fyl2x();
+      __ lea(esp, Operand(esp, kDoubleSize));
+      __ X87SetFPUCW(0x037F);
+      break;
     case kX87LoadFloat64Constant: {
       InstructionOperand* source = instr->InputAt(0);
       InstructionOperand* destination = instr->Output();
       DCHECK(source->IsConstant());
       X87OperandConverter g(this, nullptr);
       Constant src_constant = g.ToConstant(source);
 
       DCHECK_EQ(Constant::kFloat64, src_constant.type());
       uint64_t src = bit_cast<uint64_t>(src_constant.ToFloat64());
       uint32_t lower = static_cast<uint32_t>(src);
@@ skipping 1584 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8