[builtins] Introduce proper base::ieee754::log.

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

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index 28aacfe2c463d59e578dd4d91259fb352ab1ac84..9ed183a391668cc076f9c03a4e56e2257daa02c9 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -840,6 +840,10 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       __ leaq(i.OutputRegister(), Operand(base, offset.offset()));
       break;
     }
+    case kIeee754Float64Log:
+      __ PrepareCallCFunction(1);
+      __ CallCFunction(ExternalReference::ieee754_log_function(isolate()), 1);
+      break;
     case kX64Add32:
       ASSEMBLE_BINOP(addl);
       break;
@@ -1008,16 +1012,6 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
         __ 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;