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/* See LICENSE file for copyright and license details. */
ZAHL_INLINE void zinit(z_t a) { a->alloced = 0; a->chars = 0; }
ZAHL_INLINE int zeven(z_t a) { return !a->sign || !(a->chars[0] & 1); }
ZAHL_INLINE int zodd(z_t a) { return a->sign && (a->chars[0] & 1); }
ZAHL_INLINE int zeven_nonzero(z_t a) { return !(a->chars[0] & 1); }
ZAHL_INLINE int zodd_nonzero(z_t a) { return (a->chars[0] & 1); }
ZAHL_INLINE int zzero(z_t a) { return !a->sign; }
ZAHL_INLINE int zsignum(z_t a) { return a->sign; }
ZAHL_INLINE void zabs(z_t a, z_t b) { ZAHL_SET(a, b); a->sign = !!a->sign; }
ZAHL_INLINE void zneg(z_t a, z_t b) { ZAHL_SET(a, b); a->sign = -a->sign; }
ZAHL_INLINE void
zswap(z_t a, z_t b)
{
z_t t;
t->sign = a->sign;
a->sign = b->sign;
b->sign = t->sign;
t->used = b->used;
b->used = a->used;
a->used = t->used;
t->alloced = a->alloced;
a->alloced = b->alloced;
b->alloced = t->alloced;
t->chars = b->chars;
b->chars = a->chars;
a->chars = t->chars;
}
ZAHL_INLINE void
zseti(z_t a, int64_t b)
{
if (ZAHL_UNLIKELY(b >= 0)) {
zsetu(a, (uint64_t)b);
} else {
zsetu(a, (uint64_t)-b);
ZAHL_SET_SIGNUM(a, -1);
}
}
ZAHL_INLINE size_t
zlsb(z_t a)
{
size_t i = 0;
if (ZAHL_UNLIKELY(zzero(a)))
return SIZE_MAX;
for (; !a->chars[i]; i++);
i *= 8 * sizeof(zahl_char_t);
ZAHL_ADD_CTZ(i, a->chars[i]);
return i;
}
ZAHL_INLINE size_t
zbits(z_t a)
{
size_t rc;
if (ZAHL_UNLIKELY(zzero(a)))
return 1;
while (!a->chars[a->used - 1]) a->used--; /* TODO should not be necessary */
rc = a->used * 8 * sizeof(zahl_char_t);
ZAHL_SUB_CLZ(rc, a->chars[a->used - 1]);
return rc;
}
ZAHL_INLINE int
zcmpmag(z_t a, z_t b)
{
size_t i, j;
if (ZAHL_UNLIKELY(zzero(a))) return -!zzero(b);
if (ZAHL_UNLIKELY(zzero(b))) return 1;
i = a->used - 1;
j = b->used - 1;
#if 0 /* TODO this should be sufficient. */
if (i != j)
return (i > j) * 2 - 1;
#else
for (; i > j; i--) {
if (a->chars[i])
return +1;
a->used--;
}
for (; j > i; j--) {
if (b->chars[j])
return -1;
b->used--;
}
#endif
for (; i && a->chars[i] == b->chars[i]; i--);
return a->chars[i] < b->chars[i] ? -1 : a->chars[i] > b->chars[i];
}
ZAHL_INLINE int
zcmp(z_t a, z_t b)
{
if (zsignum(a) != zsignum(b))
return zsignum(a) < zsignum(b) ? -1 : zsignum(a) > zsignum(b);
return zsignum(a) * zcmpmag(a, b);
}
ZAHL_INLINE int
zcmpu(z_t a, uint64_t b)
{
extern z_t libzahl_tmp_cmp;
if (ZAHL_UNLIKELY(!b))
return zsignum(a);
if (ZAHL_UNLIKELY(zsignum(a) <= 0))
return -1;
libzahl_tmp_cmp->chars[0] = b;
return zcmpmag(a, libzahl_tmp_cmp);
}
ZAHL_INLINE int
zcmpi(z_t a, int64_t b)
{
extern z_t libzahl_tmp_cmp;
if (ZAHL_UNLIKELY(!b))
return zsignum(a);
if (ZAHL_UNLIKELY(zzero(a)))
return ZAHL_LIKELY(b < 0) ? 1 : -1;
if (ZAHL_LIKELY(b < 0)) {
if (zsignum(a) > 0)
return +1;
libzahl_tmp_cmp->chars[0] = (zahl_char_t)-b;
return -zcmpmag(a, libzahl_tmp_cmp);
} else {
if (zsignum(a) < 0)
return -1;
libzahl_tmp_cmp->chars[0] = (zahl_char_t)b;
return +zcmpmag(a, libzahl_tmp_cmp);
}
}
void zbset_impl_set(z_t a, size_t bit);
void zbset_impl_clear(z_t a, size_t bit);
void zbset_impl_flip(z_t a, size_t bit);
ZAHL_INLINE void
zbset(z_t a, z_t b, size_t bit, int action)
{
if (ZAHL_UNLIKELY(a != b))
zset(a, b);
#ifdef ZAHL_CONST_P
if (ZAHL_CONST_P(action) && ZAHL_CONST_P(bit)) {
zahl_char_t mask = 1;
if (zzero(a) || ZAHL_FLOOR_BITS_TO_CHARS(bit) >= a->used) {
if (!action)
return;
goto fallback;
}
mask <<= ZAHL_BITS_IN_LAST_CHAR(bit);
if (action > 0) {
a->chars[ZAHL_FLOOR_BITS_TO_CHARS(bit)] |= mask;
return;
} else if (action < 0) {
a->chars[ZAHL_FLOOR_BITS_TO_CHARS(bit)] ^= mask;
} else {
a->chars[ZAHL_FLOOR_BITS_TO_CHARS(bit)] &= ~mask;
}
ZAHL_TRIM_AND_ZERO(a);
return;
}
fallback:
#endif
if (action > 0)
zbset_impl_set(a, bit);
else if (action < 0)
zbset_impl_flip(a, bit);
else
zbset_impl_clear(a, bit);
}
ZAHL_INLINE int
zbtest(z_t a, size_t bit)
{
size_t chars;
if (ZAHL_UNLIKELY(zzero(a)))
return 0;
chars = ZAHL_FLOOR_BITS_TO_CHARS(bit);
if (ZAHL_UNLIKELY(chars >= a->used))
return 0;
bit &= ZAHL_BITS_IN_LAST_CHAR(bit);
return (a->chars[chars] >> bit) & 1;
}
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