#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