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

     1  #include <math.h>
     2  #include <stdint.h>
     3  
     4  float fabsf(float x)
     5  {
     6  	union {float f; uint32_t i;} u = {x};
     7  	u.i &= 0x7fffffff;
     8  	return u.f;
     9  }