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

     1  #include <math.h>
     2  
     3  #if __ARM_PCS_VFP || (__VFP_FP__ && !__SOFTFP__)
     4  
     5  double sqrt(double x)
     6  {
     7  	__asm__ ("vsqrt.f64 %P0, %P1" : "=w"(x) : "w"(x));
     8  	return x;
     9  }
    10  
    11  #else
    12  
    13  #include "../sqrt.c"
    14  
    15  #endif