github.com/afumu/libc@v0.0.6/musl/src/math/x86_64/sqrt.c (about)

     1  #include <math.h>
     2  
     3  double sqrt(double x)
     4  {
     5  	__asm__ ("sqrtsd %1, %0" : "=x"(x) : "x"(x));
     6  	return x;
     7  }