[builtins] Introduce proper Float64Exp operator.

src/ia32/codegen-ia32.cc

Index: src/ia32/codegen-ia32.cc
diff --git a/src/ia32/codegen-ia32.cc b/src/ia32/codegen-ia32.cc
index 267fe5c596d2d14e13d8bfc25f722e26be3353b5..18e53641e676d2ba2ea35f2a3ba2af5640ca48cf 100644
--- a/src/ia32/codegen-ia32.cc
+++ b/src/ia32/codegen-ia32.cc
@@ -34,43 +34,6 @@ void StubRuntimeCallHelper::AfterCall(MacroAssembler* masm) const {
 #define __ masm.
 
 
-UnaryMathFunctionWithIsolate CreateExpFunction(Isolate* isolate) {
-  size_t actual_size;
-  byte* buffer =
-      static_cast<byte*>(base::OS::Allocate(1 * KB, &actual_size, true));
-  if (buffer == nullptr) return nullptr;
-  ExternalReference::InitializeMathExpData();
-
-  MacroAssembler masm(isolate, buffer, static_cast<int>(actual_size),
-                      CodeObjectRequired::kNo);
-  // esp[1 * kPointerSize]: raw double input
-  // esp[0 * kPointerSize]: return address
-  {
-    XMMRegister input = xmm1;
-    XMMRegister result = xmm2;
-    __ movsd(input, Operand(esp, 1 * kPointerSize));
-    __ push(eax);
-    __ push(ebx);
-
-    MathExpGenerator::EmitMathExp(&masm, input, result, xmm0, eax, ebx);
-
-    __ pop(ebx);
-    __ pop(eax);
-    __ movsd(Operand(esp, 1 * kPointerSize), result);
-    __ fld_d(Operand(esp, 1 * kPointerSize));
-    __ Ret();
-  }
-
-  CodeDesc desc;
-  masm.GetCode(&desc);
-  DCHECK(!RelocInfo::RequiresRelocation(desc));
-
-  Assembler::FlushICache(isolate, buffer, actual_size);
-  base::OS::ProtectCode(buffer, actual_size);
-  return FUNCTION_CAST<UnaryMathFunctionWithIsolate>(buffer);
-}
-
-
 UnaryMathFunctionWithIsolate CreateSqrtFunction(Isolate* isolate) {
   size_t actual_size;
   // Allocate buffer in executable space.
@@ -928,64 +891,6 @@ void StringCharLoadGenerator::Generate(MacroAssembler* masm,
   __ bind(&done);
 }
 
-
-static Operand ExpConstant(int index) {
-  return Operand::StaticVariable(ExternalReference::math_exp_constants(index));
-}
-
-
-void MathExpGenerator::EmitMathExp(MacroAssembler* masm,
-                                   XMMRegister input,
-                                   XMMRegister result,
-                                   XMMRegister double_scratch,
-                                   Register temp1,
-                                   Register temp2) {
-  DCHECK(!input.is(double_scratch));
-  DCHECK(!input.is(result));
-  DCHECK(!result.is(double_scratch));
-  DCHECK(!temp1.is(temp2));
-  DCHECK(ExternalReference::math_exp_constants(0).address() != NULL);
-  DCHECK(!masm->serializer_enabled());  // External references not serializable.
-
-  Label done;
-
-  __ movsd(double_scratch, ExpConstant(0));
-  __ xorpd(result, result);
-  __ ucomisd(double_scratch, input);
-  __ j(above_equal, &done);
-  __ ucomisd(input, ExpConstant(1));
-  __ movsd(result, ExpConstant(2));
-  __ j(above_equal, &done);
-  __ movsd(double_scratch, ExpConstant(3));
-  __ movsd(result, ExpConstant(4));
-  __ mulsd(double_scratch, input);
-  __ addsd(double_scratch, result);
-  __ movd(temp2, double_scratch);
-  __ subsd(double_scratch, result);
-  __ movsd(result, ExpConstant(6));
-  __ mulsd(double_scratch, ExpConstant(5));
-  __ subsd(double_scratch, input);
-  __ subsd(result, double_scratch);
-  __ movsd(input, double_scratch);
-  __ mulsd(input, double_scratch);
-  __ mulsd(result, input);
-  __ mov(temp1, temp2);
-  __ mulsd(result, ExpConstant(7));
-  __ subsd(result, double_scratch);
-  __ add(temp1, Immediate(0x1ff800));
-  __ addsd(result, ExpConstant(8));
-  __ and_(temp2, Immediate(0x7ff));
-  __ shr(temp1, 11);
-  __ shl(temp1, 20);
-  __ movd(input, temp1);
-  __ pshufd(input, input, static_cast<uint8_t>(0xe1));  // Order: 11 10 00 01
-  __ movsd(double_scratch, Operand::StaticArray(
-      temp2, times_8, ExternalReference::math_exp_log_table()));
-  __ orps(input, double_scratch);
-  __ mulsd(result, input);
-  __ bind(&done);
-}
-
 #undef __