C++ using x87 FSQRT instruction

fsqrt.cpp

#include <iostream>

using namespace std;

double x      = 1.25;
double result = 0.00;

int main()
{
  asm(
    ".intel_syntax noprefix;"
    "finit;"
    "fld    qword ptr [x];"
    "fsqrt;"
    "fst    qword ptr [result];"
  );

  cout.precision(16);
  cout << result << endl;

  return 0;
}