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/*
* Copyright © 2013 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <ao_int64.h>
void ao_plus64(ao_int64_t *r, ao_int64_t *a, ao_int64_t *b) {
uint32_t t;
r->high = a->high + b->high;
t = a->low + b->low;
if (t < a->low)
r->high++;
r->low = t;
}
void ao_rshift64(ao_int64_t *r, ao_int64_t *a, uint8_t d) {
if (d < 32) {
r->low = a->low >> d;
if (d)
r->low |= a->high << (32 - d);
r->high = (int32_t) a->high >> d;
} else {
d &= 0x1f;
r->low = (int32_t) a->high >> d;
r->high = 0;
}
}
void ao_lshift64(ao_int64_t *r, ao_int64_t *a, uint8_t d) {
if (d < 32) {
r->high = a->high << d;
if (d)
r->high |= a->low >> (32 - d);
r->low = a->low << d;
} else {
d &= 0x1f;
r->high = a->low << d;
r->low = 0;
}
}
static void ao_umul64_32_32(ao_int64_t *r, uint32_t a, uint32_t b)
{
uint32_t r1;
uint32_t r2, r3, r4;
ao_int64_t s,t,u,v;
r1 = (uint32_t) (uint16_t) a * (uint16_t) b;
r2 = (uint32_t) (uint16_t) (a >> 16) * (uint16_t) b;
r3 = (uint32_t) (uint16_t) a * (uint16_t) (b >> 16);
r4 = (uint32_t) (uint16_t) (a >> 16) * (uint16_t) (b >> 16);
s.low = r1;
s.high = r4;
t.high = r2 >> 16;
t.low = r2 << 16;
ao_plus64(&u, &s, &t);
v.high = r3 >> 16;
v.low = r3 << 16;
ao_plus64(r, &u, &v);
}
void ao_neg64(ao_int64_t *r, ao_int64_t *a) {
r->high = ~a->high;
r->low = ~a->low;
if (!++r->low)
r->high++;
}
void ao_mul64_32_32(ao_int64_t *r, int32_t a, int32_t b) {
uint8_t negative = 0;
if (a < 0) {
a = -a;
negative = ~0;
}
if (b < 0) {
b = -b;
negative = ~negative;
}
ao_umul64_32_32(r, a, b);
if (negative)
ao_neg64(r, r);
}
static void ao_umul64(ao_int64_t *r, ao_int64_t *a, ao_int64_t *b) {
ao_int64_t r2, r3;
ao_umul64_32_32(&r2, a->high, b->low);
ao_umul64_32_32(&r3, a->low, b->high);
ao_umul64_32_32(r, a->low, b->low);
r->high += r2.low + r3.low;
}
void ao_mul64(ao_int64_t *r, ao_int64_t *a, ao_int64_t *b) {
uint8_t negative = 0;
ao_int64_t ap, bp;
if (ao_int64_negativep(a)) {
ao_neg64(&ap, a);
a = ≈
negative = ~0;
}
if (ao_int64_negativep(b)) {
ao_neg64(&bp, b);
b = &bp;
negative = ~negative;
}
ao_umul64(r, a, b);
if (negative)
ao_neg64(r, r);
}
void ao_umul64_64_16(ao_int64_t *r, ao_int64_t *a, uint16_t b) {
uint32_t h = a->high * b;
ao_umul64_32_32(r, a->low, b);
r->high += h;
}
void ao_mul64_64_16(ao_int64_t *r, ao_int64_t *a, uint16_t b) {
ao_int64_t ap;
uint8_t negative = 0;
if ((int32_t) a->high < 0) {
ao_neg64(&ap, a);
a = ≈
negative = ~0;
} else
ao_umul64_64_16(r, a, b);
if (negative)
ao_neg64(r, r);
}
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