fusl/src/math/arm/sqrt.c

#include <math.h>

#if __VFP_FP__ && !__SOFTFP__

double sqrt(double x) {
  __asm__("vsqrt.f64 %P0, %P1" : "=w"(x) : "w"(x));
  return x;
}

#else

#include "../sqrt.c"

#endif