#include <limits.h>
#include "libm.h"

#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
int ilogbl(long double x)
{
        return ilogb(x);
}
#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
int ilogbl(long double x)
{
        #pragma STDC FENV_ACCESS ON
        union ldshape u = {x};
        uint64_t m = u.i.m;
        int e = u.i.se & 0x7fff;

        if (!e) {
                if (m == 0) {
                        FORCE_EVAL(0/0.0f);
                        return FP_ILOGB0;
                }
                /* subnormal x */
                for (e = -0x3fff+1; m>>63 == 0; e--, m<<=1);
                return e;
        }
        if (e == 0x7fff) {
                FORCE_EVAL(0/0.0f);
                return m<<1 ? FP_ILOGBNAN : INT_MAX;
        }
        return e - 0x3fff;
}
#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
int ilogbl(long double x)
{
        #pragma STDC FENV_ACCESS ON
        union ldshape u = {x};
        int e = u.i.se & 0x7fff;

        if (!e) {
                if (x == 0) {
                        FORCE_EVAL(0/0.0f);
                        return FP_ILOGB0;
                }
                /* subnormal x */
                x *= 0x1p120;
                return ilogbl(x) - 120;
        }
        if (e == 0x7fff) {
                FORCE_EVAL(0/0.0f);
                u.i.se = 0;
                return u.f ? FP_ILOGBNAN : INT_MAX;
        }
        return e - 0x3fff;
}
#endif