text: #include "libm.h"
  
  #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
  long double copysignl(long double x, long double y) { return copysign(x, y); }
  #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
  long double copysignl(long double x, long double y) {
    union ldshape ux = {x}, uy = {y};
    ux.i.se &= 0x7fff;
    ux.i.se |= uy.i.se & 0x8000;
    return ux.f;
  }
  #endif
  