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/* This file is part of the gf2x library.
Copyright 2007, 2008, 2009, 2010, 2013, 2014, 2015
Richard Brent, Pierrick Gaudry, Emmanuel Thome', Paul Zimmermann
This program is free software; you can redistribute it and/or modify it
under the terms of either:
- If the archive contains a file named toom-gpl.c (not a trivial
placeholder), the GNU General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
- If the archive contains a file named toom-gpl.c which is a trivial
placeholder, the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
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 license text for more details.
You should have received a copy of the GNU General Public License as
well as the GNU Lesser General Public License along with this program;
see the files COPYING and COPYING.LIB. If not, write to the Free
Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301, USA.
*/
#include "gf2x/gf2x-config.h"
#include "gf2x/gf2x-thresholds.h"
#include "test-tools.h"
/* Fill the ulong* array a by n1 32-bit values in geometric progression.
* Returns a value which is appropriate for chaining.
*/
uint32_t fill(unsigned long * a, int n1, uint32_t startvalue, uint32_t ratio)
{
int i;
uint32_t v = startvalue;
#if GF2X_WORDSIZE == 32
for(i = 0 ; i < n1 ; i++) { a[i] = v; v *= ratio; }
#elif GF2X_WORDSIZE == 64
int N1 = n1 / 2 + (n1 & 1);
unsigned long w = 1;
for(i = 0 ; i < N1 ; i++) {
w = (unsigned long) v * (unsigned long) ratio;
a[i] = w << 32 | (unsigned long) v;
v = w * ratio;
}
if (n1 & 1) { v = w; a[N1-1] &= (1UL << 32) - 1; }
#else
#error "Config problem"
#endif
return v;
}
#define RED(l,h) do { \
/* Compute crc mod x^32 + x^7 + x^6 + x^2 + 1 */ \
l ^= h ^ h << 2 ^ h << 6 ^ h << 7; \
h = h >> 30 ^ h >> 26 ^ h >> 25; \
/* h is at most 7 bits now. */ \
l ^= h ^ h << 2 ^ h << 6 ^ h << 7; \
h = 0; \
} while (0)
uint32_t crc32(unsigned long * c, int n3, uint32_t v)
{
int i;
#if GF2X_WORDSIZE == 32
for(i = 0 ; i < n3 ; i++) {
uint32_t l,h;
l = c[n3-1-i];
h = v;
RED(l,h);
v = l;
}
#elif GF2X_WORDSIZE == 64
int N3 = n3 / 2 + (n3 & 1);
i = 0;
for(int j = 0 ; j < N3 ; j++) {
uint32_t l, h;
unsigned long cj = c[N3-1-j];
if (2*(N3-1-j) + 1 < n3) {
h = v;
l = cj >> 32;
RED(l,h);
i++;
v = l;
}
if (i == n3) break;
if (2*(N3-1-j) < n3) {
h = v;
l = cj;
RED(l,h);
i++;
v = l;
}
if (i == n3) break;
}
#endif
return v;
}
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