mp *x = MP_ONE, *X = MP_ZERO;
mp *y = MP_ZERO, *Y = MP_ONE;
mp *u, *v;
- mp *q = MP_NEW;
+ mp *q = MP_NEW, *t, *spare = MP_NEW;
unsigned f = 0;
#define f_swap 1u
*/
if (MPX_UCMP(a->v, a->vl, <, b->v, b->vl)) {
- { mp *t = a; a = b; b = t; }
+ t = a; a = b; b = t;
f |= f_swap;
}
v = MP_COPY(b);
while (!MP_ZEROP(v)) {
- mp *t;
gf_div(&q, &u, u, v);
if (f & f_ext) {
- t = gf_mul(MP_NEW, X, q);
+ t = gf_mul(spare, X, q);
t = gf_add(t, t, x);
- MP_DROP(x); x = X; X = t;
- t = gf_mul(MP_NEW, Y, q);
+ spare = x; x = X; X = t;
+ t = gf_mul(spare, Y, q);
t = gf_add(t, t, y);
- MP_DROP(y); y = Y; Y = t;
+ spare = y; y = Y; Y = t;
}
t = u; u = v; v = t;
}
- MP_DROP(q);
+ MP_DROP(q); if (spare) MP_DROP(spare);
if (!gcd)
MP_DROP(u);
else {
/* --- If @a@ and @b@ got swapped, swap the coefficients back --- */
if (f & f_swap) {
- mp *t = x; x = y; y = t;
+ t = x; x = y; y = t;
t = a; a = b; b = t;
}
mp *x = MP_ONE, *X = MP_ZERO;
mp *y = MP_ZERO, *Y = MP_ONE;
mp *u, *v;
- mp *q = MP_NEW;
+ mp *q = MP_NEW, *t, *spare = MP_NEW;
unsigned f = 0;
#define f_swap 1u
*/
if (MPX_UCMP(a->v, a->vl, <, b->v, b->vl)) {
- { mp *t = a; a = b; b = t; }
+ t = a; a = b; b = t;
f |= f_swap;
}
/* --- Check for zeroness --- */
- if (MP_EQ(b, MP_ZERO)) {
+ if (MP_ZEROP(b)) {
/* --- Store %$|a|$% as the GCD --- */
if (f & f_ext) {
if (f & f_swap) {
- mp **t = xx; xx = yy; yy = t;
+ mp **tt = xx; xx = yy; yy = tt;
}
if (xx) {
if (*xx) MP_DROP(*xx);
/* --- Main extended Euclidean algorithm --- */
while (!MP_ZEROP(v)) {
- mp *t;
mp_div(&q, &u, u, v);
if (f & f_ext) {
- t = mp_mul(MP_NEW, X, q);
+ t = mp_mul(spare, X, q);
t = mp_sub(t, x, t);
- MP_DROP(x); x = X; X = t;
- t = mp_mul(MP_NEW, Y, q);
+ spare = x; x = X; X = t;
+ t = mp_mul(spare, Y, q);
t = mp_sub(t, y, t);
- MP_DROP(y); y = Y; Y = t;
+ spare = y; y = Y; Y = t;
}
t = u; u = v; v = t;
}
- MP_DROP(q);
+ MP_DROP(q); if (spare) MP_DROP(spare);
if (!gcd)
MP_DROP(u);
else {
/* --- If @a@ and @b@ got swapped, swap the coefficients back --- */
if (f & f_swap) {
- mp *t = x; x = y; y = t;
+ t = x; x = y; y = t;
t = a; a = b; b = t;
}