#include "libm.h"

#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
long double nextafterl(long double x, long double y) {
  return nextafter(x, y);
}
#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
long double nextafterl(long double x, long double y) {
  union ldshape ux, uy;

  if (isnan(x) || isnan(y))
    return x + y;
  if (x == y)
    return y;
  ux.f = x;
  if (x == 0) {
    uy.f = y;
    ux.i.m = 1;
    ux.i.se = uy.i.se & 0x8000;
  } else if ((x < y) == !(ux.i.se & 0x8000)) {
    ux.i.m++;
    if (ux.i.m << 1 == 0) {
      ux.i.m = 1ULL << 63;
      ux.i.se++;
    }
  } else {
    if (ux.i.m << 1 == 0) {
      ux.i.se--;
      if (ux.i.se)
        ux.i.m = 0;
    }
    ux.i.m--;
  }
  /* raise overflow if ux is infinite and x is finite */
  if ((ux.i.se & 0x7fff) == 0x7fff)
    return x + x;
  /* raise underflow if ux is subnormal or zero */
  if ((ux.i.se & 0x7fff) == 0)
    FORCE_EVAL(x * x + ux.f * ux.f);
  return ux.f;
}
#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
long double nextafterl(long double x, long double y) {
  union ldshape ux, uy;

  if (isnan(x) || isnan(y))
    return x + y;
  if (x == y)
    return y;
  ux.f = x;
  if (x == 0) {
    uy.f = y;
    ux.i.lo = 1;
    ux.i.se = uy.i.se & 0x8000;
  } else if ((x < y) == !(ux.i.se & 0x8000)) {
    ux.i2.lo++;
    if (ux.i2.lo == 0)
      ux.i2.hi++;
  } else {
    if (ux.i2.lo == 0)
      ux.i2.hi--;
    ux.i2.lo--;
  }
  /* raise overflow if ux is infinite and x is finite */
  if ((ux.i.se & 0x7fff) == 0x7fff)
    return x + x;
  /* raise underflow if ux is subnormal or zero */
  if ((ux.i.se & 0x7fff) == 0)
    FORCE_EVAL(x * x + ux.f * ux.f);
  return ux.f;
}
#endif