/**
- * collectd - src/sn_network.c
- * Copyright (C) 2008 Florian octo Forster
+ * libsortnetwork - src/sn_network.c
+ * Copyright (C) 2008-2010 Florian octo Forster
*
* 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
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors:
- * Florian octo Forster <octo at verplant.org>
+ * Florian octo Forster <ff at octo.it>
**/
#ifndef _ISOC99_SOURCE
free (n);
} /* }}} void sn_network_destroy */
+sn_network_t *sn_network_create_odd_even_mergesort (int inputs_num) /* {{{ */
+{
+ sn_network_t *n;
+
+ n = sn_network_create (inputs_num);
+
+ assert (inputs_num > 0);
+ if (inputs_num == 1)
+ {
+ return (n);
+ }
+ if (inputs_num == 2)
+ {
+ sn_stage_t *s;
+ sn_comparator_t c;
+
+ c.min = 0;
+ c.max = 1;
+
+ s = sn_stage_create (/* depth = */ 0);
+ sn_stage_comparator_add (s, &c);
+ sn_network_stage_add (n, s);
+
+ return (n);
+ }
+ else
+ {
+ sn_network_t *n_left;
+ sn_network_t *n_right;
+ int inputs_left;
+ int inputs_right;
+
+ inputs_left = inputs_num / 2;
+ inputs_right = inputs_num - inputs_left;
+
+ n_left = sn_network_create_odd_even_mergesort (inputs_left);
+ if (n_left == NULL)
+ return (NULL);
+
+ n_right = sn_network_create_odd_even_mergesort (inputs_right);
+ if (n_right == NULL)
+ {
+ sn_network_destroy (n_left);
+ return (NULL);
+ }
+
+ n = sn_network_combine_odd_even_merge (n_left, n_right);
+
+ sn_network_destroy (n_left);
+ sn_network_destroy (n_right);
+
+ if (n != NULL)
+ sn_network_compress (n);
+
+ return (n);
+ }
+} /* }}} sn_network_t *sn_network_create_odd_even_mergesort */
+
int sn_network_stage_add (sn_network_t *n, sn_stage_t *s) /* {{{ */
{
sn_stage_t **temp;
if (nmemb > 0)
{
memmove (n->stages + s_num, n->stages + (s_num + 1),
- nmemb * sizeof (sn_stage_t *));
+ nmemb * sizeof (sn_stage_t *));
n->stages[n->stages_num - 1] = NULL;
}
n->stages_num--;
else
{
temp = (sn_stage_t **) realloc (n->stages,
- n->stages_num * sizeof (sn_stage_t *));
+ n->stages_num * sizeof (sn_stage_t *));
if (temp == NULL)
return (-1);
n->stages = temp;
return (n_copy);
} /* }}} sn_network_t *sn_network_clone */
+int sn_network_comparator_add (sn_network_t *n, /* {{{ */
+ const sn_comparator_t *c)
+{
+ sn_stage_t *s;
+
+ if ((n == NULL) || (c == NULL))
+ return (-1);
+
+ if (n->stages_num > 0)
+ {
+ s = n->stages[n->stages_num - 1];
+
+ if (sn_stage_comparator_check_conflict (s, c) == 0)
+ {
+ sn_stage_comparator_add (s, c);
+ return (0);
+ }
+ }
+
+ s = sn_stage_create (n->stages_num);
+ sn_stage_comparator_add (s, c);
+ sn_network_stage_add (n, s);
+
+ return (0);
+} /* }}} int sn_network_comparator_add */
+
+int sn_network_get_comparator_num (const sn_network_t *n) /* {{{ */
+{
+ int num;
+ int i;
+
+ if (n == NULL)
+ return (-1);
+
+ num = 0;
+ for (i = 0; i < n->stages_num; i++)
+ num += n->stages[i]->comparators_num;
+
+ return (num);
+} /* }}} int sn_network_get_comparator_num */
+
int sn_network_show (sn_network_t *n) /* {{{ */
{
int i;
for (i = 1; i < n->stages_num; i++)
{
sn_stage_t *s;
-
+
s = n->stages[i];
-
+
for (j = 0; j < SN_STAGE_COMP_NUM (s); j++)
{
sn_comparator_t *c = SN_STAGE_COMP_GET (s, j);
for (k = i - 1; k >= 0; k--)
{
- int conflict;
-
- conflict = sn_stage_comparator_check_conflict (n->stages[k], c);
- if (conflict == 0)
- {
- move_to = k;
- continue;
- }
-
- if (conflict == 2)
- move_to = -1;
- break;
+ int conflict;
+
+ conflict = sn_stage_comparator_check_conflict (n->stages[k], c);
+ if (conflict == 0)
+ {
+ move_to = k;
+ continue;
+ }
+
+ if (conflict == 2)
+ move_to = -1;
+ break;
}
if (move_to < i)
{
- if (move_to >= 0)
- sn_stage_comparator_add (n->stages[move_to], c);
- sn_stage_comparator_remove (s, j);
- j--;
+ if (move_to >= 0)
+ sn_stage_comparator_add (n->stages[move_to], c);
+ sn_stage_comparator_remove (s, j);
+ j--;
}
}
}
{
int i;
- for (i = n->stages_num - 1; i >= 0; i--)
+ for (i = 0; i < n->stages_num; i++)
{
sn_stage_t *s;
int j;
if (min > max)
{
- int k;
+ int k;
+
+ for (k = i; k < n->stages_num; k++)
+ sn_stage_swap (n->stages[k], min, max);
- for (k = i; k >= 0; k--)
- sn_stage_swap (n->stages[k], min, max);
+ i = -1;
+ break; /* for (j) */
}
} /* for (j = 0 .. #comparators) */
} /* for (i = n->stages_num - 1 .. 0) */
int j;
for (j = 0; j < i; j++)
- sn_stage_swap (n->stages[j], position, new_position);
+ sn_stage_swap (n->stages[j], position, new_position);
}
position = new_position;
if (i < n0->stages_num)
for (j = 0; j < SN_STAGE_COMP_NUM (n0->stages[i]); j++)
{
- sn_comparator_t *c = SN_STAGE_COMP_GET (n0->stages[i], j);
- sn_stage_comparator_add (s, c);
+ sn_comparator_t *c = SN_STAGE_COMP_GET (n0->stages[i], j);
+ sn_stage_comparator_add (s, c);
}
if (i < n1->stages_num)
for (j = 0; j < SN_STAGE_COMP_NUM (n1->stages[i]); j++)
{
- sn_comparator_t *c_orig = SN_STAGE_COMP_GET (n1->stages[i], j);
- sn_comparator_t c_copy;
+ sn_comparator_t *c_orig = SN_STAGE_COMP_GET (n1->stages[i], j);
+ sn_comparator_t c_copy;
- SN_COMP_MIN(&c_copy) = SN_COMP_MIN(c_orig) + n0->inputs_num;
- SN_COMP_MAX(&c_copy) = SN_COMP_MAX(c_orig) + n0->inputs_num;
+ SN_COMP_MIN(&c_copy) = SN_COMP_MIN(c_orig) + n0->inputs_num;
+ SN_COMP_MAX(&c_copy) = SN_COMP_MAX(c_orig) + n0->inputs_num;
- sn_stage_comparator_add (s, &c_copy);
+ sn_stage_comparator_add (s, &c_copy);
}
sn_network_stage_add (n, s);
return (0);
} /* }}} int sn_network_add_bitonic_merger */
-static int sn_network_add_odd_even_merger_recursive (sn_network_t *n, /* {{{ */
- int *indizes, int indizes_num)
+static int sn_network_add_odd_even_merger (sn_network_t *n, /* {{{ */
+ int *indizes_left, int indizes_left_num,
+ int *indizes_right, int indizes_right_num)
{
- if (indizes_num > 2)
+ int tmp_left[indizes_left_num];
+ int tmp_left_num;
+ int tmp_right[indizes_left_num];
+ int tmp_right_num;
+ int max_index;
+ sn_stage_t *s;
+ int i;
+
+ if ((indizes_left_num == 0) || (indizes_right_num == 0))
+ {
+ return (0);
+ }
+ else if ((indizes_left_num == 1) && (indizes_right_num == 1))
{
sn_comparator_t c;
sn_stage_t *s;
- int indizes_half_num;
- int *indizes_half;
- int status;
- int i;
- indizes_half_num = indizes_num / 2;
- indizes_half = (int *) malloc (indizes_num * sizeof (int));
- if (indizes_half == NULL)
+ c.min = *indizes_left;
+ c.max = *indizes_right;
+
+ s = sn_stage_create (n->stages_num);
+ if (s == NULL)
return (-1);
- for (i = 0; i < indizes_half_num; i++)
- {
- indizes_half[i] = indizes[2 * i];
- indizes_half[indizes_half_num + i] = indizes[(2 * i) + 1];
- }
+ sn_stage_comparator_add (s, &c);
+ sn_network_stage_add (n, s);
- status = sn_network_add_odd_even_merger_recursive (n,
- indizes_half, indizes_half_num);
- if (status != 0)
- {
- free (indizes_half);
- return (status);
- }
+ return (0);
+ }
- status = sn_network_add_odd_even_merger_recursive (n,
- indizes_half + indizes_half_num, indizes_half_num);
- if (status != 0)
- {
- free (indizes_half);
- return (status);
- }
+ /* Merge odd sequences */
+ tmp_left_num = (indizes_left_num + 1) / 2;
+ for (i = 0; i < tmp_left_num; i++)
+ tmp_left[i] = indizes_left[2 * i];
- free (indizes_half);
+ tmp_right_num = (indizes_right_num + 1) / 2;
+ for (i = 0; i < tmp_right_num; i++)
+ tmp_right[i] = indizes_right[2 * i];
- s = sn_stage_create (n->stages_num);
- if (s == NULL)
- return (-1);
+ sn_network_add_odd_even_merger (n,
+ tmp_left, tmp_left_num,
+ tmp_right, tmp_right_num);
- for (i = 1; i < (indizes_num - 2); i += 2)
- {
- c.min = indizes[i];
- c.max = indizes[i + 1];
+ /* Merge even sequences */
+ tmp_left_num = indizes_left_num / 2;
+ for (i = 0; i < tmp_left_num; i++)
+ tmp_left[i] = indizes_left[(2 * i) + 1];
- sn_stage_comparator_add (s, &c);
- }
+ tmp_right_num = indizes_right_num / 2;
+ for (i = 0; i < tmp_right_num; i++)
+ tmp_right[i] = indizes_right[(2 * i) + 1];
- sn_network_stage_add (n, s);
- }
+ sn_network_add_odd_even_merger (n,
+ tmp_left, tmp_left_num,
+ tmp_right, tmp_right_num);
+
+ /* Apply ``comparison-interchange'' operations. */
+ s = sn_stage_create (n->stages_num);
+
+ max_index = indizes_left_num + indizes_right_num;
+ if ((max_index % 2) == 0)
+ max_index -= 3;
else
+ max_index -= 2;
+
+ for (i = 1; i <= max_index; i += 2)
{
sn_comparator_t c;
- sn_stage_t *s;
-
- assert (indizes_num == 2);
- c.min = indizes[0];
- c.max = indizes[1];
+ if (i < indizes_left_num)
+ c.min = indizes_left[i];
+ else
+ c.min = indizes_right[i - indizes_left_num];
- s = sn_stage_create (n->stages_num);
- if (s == NULL)
- return (-1);
+ if ((i + 1) < indizes_left_num)
+ c.max = indizes_left[i + 1];
+ else
+ c.max = indizes_right[i + 1 - indizes_left_num];
sn_stage_comparator_add (s, &c);
- sn_network_stage_add (n, s);
}
- return (0);
-} /* }}} int sn_network_add_odd_even_merger_recursive */
-
-static int sn_network_add_odd_even_merger (sn_network_t *n) /* {{{ */
-{
- int *indizes;
- int indizes_num;
- int status;
- int i;
-
- indizes_num = n->inputs_num;
- indizes = (int *) malloc (indizes_num * sizeof (int));
- if (indizes == NULL)
- return (-1);
-
- for (i = 0; i < indizes_num; i++)
- indizes[i] = i;
+ sn_network_stage_add (n, s);
- status = sn_network_add_odd_even_merger_recursive (n,
- indizes, indizes_num);
-
- free (indizes);
- return (status);
-} /* }}} int sn_network_add_bitonic_merger */
+ return (0);
+} /* }}} int sn_network_add_odd_even_merger */
-static sn_network_t *sn_network_combine_bitonic (sn_network_t *n0, /* {{{ */
- sn_network_t *n1)
+static sn_network_t *sn_network_combine_bitonic_shift (sn_network_t *n0, /* {{{ */
+ sn_network_t *n1, int do_shift)
{
sn_network_t *n;
sn_network_t *n1_clone;
sn_network_destroy (n1_clone);
- shift = sn_bounded_random (0, SN_NETWORK_INPUT_NUM (n) - 1);
+ if (do_shift)
+ shift = sn_bounded_random (0, SN_NETWORK_INPUT_NUM (n) - 1);
+ else
+ shift = 0;
+
if (shift > 0)
{
- DPRINTF ("sn_network_combine_bitonic: Shifting by %i.\n", shift);
+ DPRINTF ("sn_network_combine_bitonic_shift: Shifting by %i.\n", shift);
sn_network_shift (n, shift);
}
sn_network_add_bitonic_merger (n);
return (n);
+} /* }}} sn_network_t *sn_network_combine_bitonic_shift */
+
+sn_network_t *sn_network_combine_bitonic (sn_network_t *n0, /* {{{ */
+ sn_network_t *n1)
+{
+ return (sn_network_combine_bitonic_shift (n0, n1, /* do_shift = */ 0));
} /* }}} sn_network_t *sn_network_combine_bitonic */
-sn_network_t *sn_network_combine (sn_network_t *n0, /* {{{ */
+sn_network_t *sn_network_combine_odd_even_merge (sn_network_t *n0, /* {{{ */
sn_network_t *n1)
{
sn_network_t *n;
+ int indizes_left[n0->inputs_num];
+ int indizes_left_num;
+ int indizes_right[n1->inputs_num];
+ int indizes_right_num;
+ int status;
+ int i;
+
+ indizes_left_num = n0->inputs_num;
+ indizes_right_num = n1->inputs_num;
+ for (i = 0; i < indizes_left_num; i++)
+ indizes_left[i] = i;
+ for (i = 0; i < indizes_right_num; i++)
+ indizes_right[i] = indizes_left_num + i;
+
+ n = sn_network_concatenate (n0, n1);
+ if (n == NULL)
+ return (NULL);
+
+ status = sn_network_add_odd_even_merger (n,
+ indizes_left, indizes_left_num,
+ indizes_right, indizes_right_num);
+ if (status != 0)
+ {
+ sn_network_destroy (n);
+ return (NULL);
+ }
+
+ sn_network_compress (n);
+ return (n);
+} /* }}} sn_network_t *sn_network_combine */
+
+sn_network_t *sn_network_combine (sn_network_t *n0, /* {{{ */
+ sn_network_t *n1, int is_power_of_two)
+{
+ sn_network_t *n;
- if (sn_bounded_random (0, 2) < 2)
+ if ((is_power_of_two != 0) && (sn_bounded_random (0, 9) == 0))
{
DPRINTF ("sn_network_combine: Using the bitonic merger.\n");
- n = sn_network_combine_bitonic (n0, n1);
+ n = sn_network_combine_bitonic_shift (n0, n1, /* do_shift = */ 1);
}
else
{
DPRINTF ("sn_network_combine: Using the odd-even merger.\n");
- n = sn_network_concatenate (n0, n1);
- if (n == NULL)
- return (NULL);
- sn_network_add_odd_even_merger (n);
+ n = sn_network_combine_odd_even_merge (n0, n1);
}
sn_network_compress (n);
for (i = 1; i < n->inputs_num; i++)
{
if (previous > values[i])
- return (1);
+ return (1);
previous = values[i];
}
{
if (test_pattern[i] == 0)
{
- test_pattern[i] = 1;
- overflow = 0;
- break;
+ test_pattern[i] = 1;
+ overflow = 0;
+ break;
}
else
{
- test_pattern[i] = 0;
- overflow = 1;
+ test_pattern[i] = 0;
+ overflow = 1;
}
}
int buffer_len = strlen (buffer);
while ((buffer_len > 0) && ((buffer[buffer_len - 1] == '\n')
- || (buffer[buffer_len - 1] == '\r')))
+ || (buffer[buffer_len - 1] == '\r')))
{
buffer_len--;
buffer[buffer_len] = '\0';
#define SNPRINTF_OR_FAIL(...) \
status = snprintf (buffer, buffer_size, __VA_ARGS__); \
- if ((status < 1) || (status >= buffer_size)) \
+ if ((status < 1) || (((size_t) status) >= buffer_size)) \
return (-1); \
buffer += status; \
buffer_size -= status;