pqc/external/flint-2.4.3/qsieve/ll_insert_relations.c

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2014-05-18 22:03:37 +00:00
/*============================================================================
This file is part of FLINT.
FLINT 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; either version 2 of the License, or
(at your option) any later version.
FLINT 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 FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===============================================================================*/
/******************************************************************************
linear_algebra.c
Routines for dealing with building the final F_2 matrix
(C) 2006, 2011 William Hart
******************************************************************************/
#define ulong ulongxx /* interferes with system includes */
#include <stdlib.h>
#include <stdio.h>
#undef ulong
#define ulong mp_limb_t
#include <gmp.h>
#include "flint.h"
#include "ulong_extras.h"
#include "qsieve.h"
#include "fmpz.h"
/*=========================================================================
Compare relations:
Function: Compare two relations; used by qsort
==========================================================================*/
int qsieve_ll_relations_cmp(const void * a, const void * b)
{
la_col_t * ra = *((la_col_t **) a);
la_col_t * rb = *((la_col_t **) b);
slong point;
if (ra->weight > rb->weight) return 1;
else if (ra->weight < rb->weight) return -1;
for (point = ra->weight - 1; point >= 0
&& (ra->data[point] == rb->data[point]); point--)
{
;
}
if (point == -1) return 0;
if (ra->data[point] > rb->data[point]) return 1;
else if (ra->data[point] < rb->data[point]) return -1;
return 0;
}
int qsieve_ll_relations_cmp2(const void * a, const void * b)
{
la_col_t * ra = (la_col_t *) a;
la_col_t * rb = (la_col_t *) b;
slong point;
if (ra->weight > rb->weight) return 1;
else if (ra->weight < rb->weight) return -1;
for (point = ra->weight - 1; point >= 0
&& (ra->data[point] == rb->data[point]); point--)
{
;
}
if (point == -1) return 0;
if (ra->data[point] > rb->data[point]) return 1;
else if (ra->data[point] < rb->data[point]) return -1;
return 0;
}
/*==========================================================================
Merge sort:
Function: Merge a list of sorted new relations into a list of existing
sorted relations. Sort is done using a merge sort algorithm
with a short stack.
===========================================================================*/
slong qsieve_ll_merge_sort(qs_t qs_inf)
{
la_col_t * matrix = qs_inf->matrix;
slong columns = qs_inf->columns;
la_col_t ** qsort_arr = qs_inf->qsort_arr;
slong num_unmerged = qs_inf->num_unmerged;
slong dups = 0;
int comp;
slong i;
for (i = columns + num_unmerged - WORD(1); i >= dups; i--)
{
if (!columns) comp = -1;
else if (!num_unmerged) comp = 1;
else
comp = qsieve_ll_relations_cmp2(matrix + columns - WORD(1), qsort_arr[num_unmerged - WORD(1)]);
switch (comp)
{
case -1:
{
copy_col(matrix + i, qsort_arr[num_unmerged - WORD(1)]);
clear_col(qsort_arr[num_unmerged - WORD(1)]);
num_unmerged--;
break;
}
case 1:
{
copy_col(matrix + i, matrix + columns - WORD(1));
columns--;
break;
}
case 0:
{
free_col(qsort_arr[num_unmerged - WORD(1)]);
clear_col(qsort_arr[num_unmerged - WORD(1)]);
num_unmerged--;
copy_col(matrix + i, matrix + columns - WORD(1));
columns--;
dups++;
break;
}
}
}
columns = qs_inf->columns + qs_inf->num_unmerged - dups;
if (dups)
{
slong i;
for (i = 0; i < columns; i++)
copy_col(matrix + i, matrix + i + dups);
for ( ; i < columns + dups; i++)
clear_col(matrix + i);
}
qs_inf->columns = columns;
columns = qs_inf->num_unmerged - dups;
qs_inf->num_unmerged = 0;
#if (QS_DEBUG & 64)
flint_printf("%wd new, %wd dups\n", columns, dups);
#endif
return columns;
}
/*==========================================================================
Merge relations:
Function: Merge unmerged relations into the matrix
===========================================================================*/
slong qsieve_ll_merge_relations(qs_t qs_inf)
{
const slong num_unmerged = qs_inf->num_unmerged;
la_col_t * unmerged = qs_inf->unmerged;
la_col_t ** qsort_arr = qs_inf->qsort_arr;
if (num_unmerged)
{
slong i;
for (i = 0; i < num_unmerged; i++)
qsort_arr[i] = unmerged + i;
qsort(qsort_arr, num_unmerged, sizeof(la_col_t *), qsieve_ll_relations_cmp);
return qsieve_ll_merge_sort(qs_inf);
}
return 0;
}
/*==========================================================================
Insert relation:
Function: Insert the relation into the matrix and store the Y value
===========================================================================*/
slong qsieve_ll_insert_relation(qs_t qs_inf, fmpz_t Y)
{
la_col_t * unmerged = qs_inf->unmerged;
slong num_unmerged = qs_inf->num_unmerged;
slong * small = qs_inf->small;
slong num_factors = qs_inf->num_factors;
fac_t * factor = qs_inf->factor;
slong * curr_rel = qs_inf->curr_rel;
slong fac_num = 0;
slong i;
clear_col(unmerged + num_unmerged);
for (i = 0; i < qs_inf->small_primes; i++)
{
if (small[i] & 1) insert_col_entry(unmerged + num_unmerged, i);
if (small[i])
{
curr_rel[2*fac_num + 1] = i;
curr_rel[2*fac_num + 2] = small[i];
fac_num++;
}
}
for (i = 0; i < num_factors; i++)
{
if (factor[i].exp & 1) insert_col_entry(unmerged + num_unmerged, factor[i].ind);
curr_rel[2*fac_num + 1] = factor[i].ind;
curr_rel[2*fac_num + 2] = factor[i].exp;
fac_num++;
}
curr_rel[0] = fac_num;
unmerged[num_unmerged].orig = qs_inf->num_relations;
fmpz_set(qs_inf->Y_arr + qs_inf->num_relations, Y);
qs_inf->curr_rel += qs_inf->max_factors*2;
qs_inf->num_unmerged++;
qs_inf->num_relations++;
if (qs_inf->num_unmerged == qs_inf->qsort_rels)
return qsieve_ll_merge_relations(qs_inf);
return 0;
}