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

     1  #include "libm.h"
     2  
     3  #if (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
     4  int __signbitl(long double x)
     5  {
     6  	union ldshape u = {x};
     7  	return u.i.se >> 15;
     8  }
     9  #elif LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
    10  int __signbitl(long double x)
    11  {
    12  	return __signbit(x);
    13  }
    14  #endif