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#include "tommath_private.h"
#ifdef BN_MP_CNT_LSB_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */
static const int lnz[16] = {
4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0
};
/* Counts the number of lsbs which are zero before the first zero bit */
int mp_cnt_lsb(const mp_int *a)
{
int x;
mp_digit q, qq;
/* easy out */
if (MP_IS_ZERO(a)) {
return 0;
}
/* scan lower digits until non-zero */
for (x = 0; (x < a->used) && (a->dp[x] == 0u); x++) {}
q = a->dp[x];
x *= MP_DIGIT_BIT;
/* now scan this digit until a 1 is found */
if ((q & 1u) == 0u) {
do {
qq = q & 15u;
x += lnz[qq];
q >>= 4;
} while (qq == 0u);
}
return x;
}
#endif
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