Remove custom win64 modulo code

src/x64/codegen-x64.cc

Index: src/x64/codegen-x64.cc
diff --git a/src/x64/codegen-x64.cc b/src/x64/codegen-x64.cc
index 4f9c87b30105361d1a1906977d1dd6d116f64391..f5a8ec35619f4da0862ea52b1af7368676036f1c 100644
--- a/src/x64/codegen-x64.cc
+++ b/src/x64/codegen-x64.cc
@@ -87,97 +87,6 @@ UnaryMathFunctionWithIsolate CreateSqrtFunction(Isolate* isolate) {
   return FUNCTION_CAST<UnaryMathFunctionWithIsolate>(buffer);
 }
 
-
-#ifdef _WIN64
-typedef double (*ModuloFunction)(double, double);
-// Define custom fmod implementation.
-ModuloFunction CreateModuloFunction() {
-  size_t actual_size;
-  byte* buffer = static_cast<byte*>(
-      base::OS::Allocate(Assembler::kMinimalBufferSize, &actual_size, true));
-  CHECK(buffer);
-  MacroAssembler masm(NULL, buffer, static_cast<int>(actual_size),
-                      CodeObjectRequired::kNo);
-  // Generated code is put into a fixed, unmovable, buffer, and not into
-  // the V8 heap. We can't, and don't, refer to any relocatable addresses
-  // (e.g. the JavaScript nan-object).
-
-  // Windows 64 ABI passes double arguments in xmm0, xmm1 and
-  // returns result in xmm0.
-  // Argument backing space is allocated on the stack above
-  // the return address.
-
-  // Compute x mod y.
-  // Load y and x (use argument backing store as temporary storage).
-  __ Movsd(Operand(rsp, kRegisterSize * 2), xmm1);
-  __ Movsd(Operand(rsp, kRegisterSize), xmm0);
-  __ fld_d(Operand(rsp, kRegisterSize * 2));
-  __ fld_d(Operand(rsp, kRegisterSize));
-
-  // Clear exception flags before operation.
-  {
-    Label no_exceptions;
-    __ fwait();
-    __ fnstsw_ax();
-    // Clear if Illegal Operand or Zero Division exceptions are set.
-    __ testb(rax, Immediate(5));
-    __ j(zero, &no_exceptions);
-    __ fnclex();
-    __ bind(&no_exceptions);
-  }
-
-  // Compute st(0) % st(1)
-  {
-    Label partial_remainder_loop;
-    __ bind(&partial_remainder_loop);
-    __ fprem();
-    __ fwait();
-    __ fnstsw_ax();
-    __ testl(rax, Immediate(0x400 /* C2 */));
-    // If C2 is set, computation only has partial result. Loop to
-    // continue computation.
-    __ j(not_zero, &partial_remainder_loop);
-  }
-
-  Label valid_result;
-  Label return_result;
-  // If Invalid Operand or Zero Division exceptions are set,
-  // return NaN.
-  __ testb(rax, Immediate(5));
-  __ j(zero, &valid_result);
-  __ fstp(0);  // Drop result in st(0).
-  int64_t kNaNValue = V8_INT64_C(0x7ff8000000000000);
-  __ movq(rcx, kNaNValue);
-  __ movq(Operand(rsp, kRegisterSize), rcx);
-  __ Movsd(xmm0, Operand(rsp, kRegisterSize));
-  __ jmp(&return_result);
-
-  // If result is valid, return that.
-  __ bind(&valid_result);
-  __ fstp_d(Operand(rsp, kRegisterSize));
-  __ Movsd(xmm0, Operand(rsp, kRegisterSize));
-
-  // Clean up FPU stack and exceptions and return xmm0
-  __ bind(&return_result);
-  __ fstp(0);  // Unload y.
-
-  Label clear_exceptions;
-  __ testb(rax, Immediate(0x3f /* Any Exception*/));
-  __ j(not_zero, &clear_exceptions);
-  __ ret(0);
-  __ bind(&clear_exceptions);
-  __ fnclex();
-  __ ret(0);
-
-  CodeDesc desc;
-  masm.GetCode(&desc);
-  base::OS::ProtectCode(buffer, actual_size);
-  // Call the function from C++ through this pointer.
-  return FUNCTION_CAST<ModuloFunction>(buffer);
-}
-
-#endif
-
 #undef __
 
 // -------------------------------------------------------------------------