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Reset nmod_poly_factor_t before writing to it #1603

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3 changes: 3 additions & 0 deletions src/nmod_poly_factor/factor.c
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Original file line number Diff line number Diff line change
Expand Up @@ -154,20 +154,23 @@ mp_limb_t
nmod_poly_factor_with_berlekamp(nmod_poly_factor_t result,
const nmod_poly_t input)
{
result->num = 0;
return __nmod_poly_factor_deflation(result, input, BERLEKAMP);
}

mp_limb_t
nmod_poly_factor_with_cantor_zassenhaus(nmod_poly_factor_t result,
const nmod_poly_t input)
{
result->num = 0;
return __nmod_poly_factor_deflation(result, input, ZASSENHAUS);
}

mp_limb_t
nmod_poly_factor_with_kaltofen_shoup(nmod_poly_factor_t result,
const nmod_poly_t input)
{
result->num = 0;
return __nmod_poly_factor_deflation(result, input, KALTOFEN);
}

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2 changes: 2 additions & 0 deletions src/nmod_poly_factor/factor_cantor_zassenhaus.c
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Expand Up @@ -31,6 +31,8 @@ nmod_poly_factor_cantor_zassenhaus(nmod_poly_factor_t res, const nmod_poly_t f)

nmod_poly_make_monic(v, f);

res->num = 0;

i = 0;
do
{
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2 changes: 2 additions & 0 deletions src/nmod_poly_factor/factor_distinct_deg.c
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Expand Up @@ -38,6 +38,8 @@ void nmod_poly_factor_distinct_deg(nmod_poly_factor_t res,

nmod_poly_make_monic(v, poly);

res->num = 0;

if (n == 1)
{
nmod_poly_factor_insert(res, v, 1);
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2 changes: 2 additions & 0 deletions src/nmod_poly_factor/factor_distinct_deg_threaded.c
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Expand Up @@ -176,6 +176,8 @@ void nmod_poly_factor_distinct_deg_threaded(nmod_poly_factor_t res,

nmod_poly_make_monic(v, poly);

res->num = 0;

if (n == 1)
{
nmod_poly_factor_insert(res, v, 1);
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8 changes: 4 additions & 4 deletions src/nmod_poly_factor/factor_kaltofen_shoup.c
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Expand Up @@ -18,13 +18,15 @@ void nmod_poly_factor_kaltofen_shoup(nmod_poly_factor_t res,
{
nmod_poly_t v;
nmod_poly_factor_t sq_free, dist_deg;
slong i, j, k, l, res_num, dist_deg_num;
slong i, j, k, l, res_num;
slong * degs;

nmod_poly_init_mod(v, poly->mod);

nmod_poly_make_monic(v, poly);

res->num = 0;

if (poly->length <= 2)
{
nmod_poly_factor_insert (res, v, 1);
Expand All @@ -48,8 +50,6 @@ void nmod_poly_factor_kaltofen_shoup(nmod_poly_factor_t res,
nmod_poly_factor_init(dist_deg);
for (i = 0; i < sq_free->num; i++)
{
dist_deg_num = dist_deg->num;

if ((flint_get_num_threads() > 1) &&
((sq_free->p + i)->length > (1024*flint_get_num_threads())/4))
nmod_poly_factor_distinct_deg_threaded(dist_deg, sq_free->p + i,
Expand All @@ -58,7 +58,7 @@ void nmod_poly_factor_kaltofen_shoup(nmod_poly_factor_t res,
nmod_poly_factor_distinct_deg(dist_deg, sq_free->p + i, &degs);

/* compute equal-degree factorisation */
for (j = dist_deg_num, l = 0; j < dist_deg->num; j++, l++)
for (j = 0, l = 0; j < dist_deg->num; j++, l++)
{
res_num = res->num;

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3 changes: 2 additions & 1 deletion src/nmod_poly_factor/factor_squarefree.c
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Expand Up @@ -22,9 +22,10 @@ nmod_poly_factor_squarefree(nmod_poly_factor_t res, const nmod_poly_t f)
mp_limb_t p;
slong deg, i;

res->num = 0;

if (f->length <= 1)
{
res->num = 0;
return;
}

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