/usr/include/m4ri/xor.h is in libm4ri-dev 20140914-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Functions for adding vectors.
*
* \author Martin Albrecht <martinralbrecht@googlemail.com>
*
*/
#ifndef M4RI_XOR_H
#define M4RI_XOR_H
/*******************************************************************
*
* M4RI: Linear Algebra over GF(2)
*
* Copyright (C) 2008-2013 Martin Albrecht <martinralbrecht@googlemail.com>
*
* Distributed under the terms of the GNU General Public License (GPL)
* version 2 or higher.
*
* This code 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.
*
* The full text of the GPL is available at:
*
* http://www.gnu.org/licenses/
*
********************************************************************/
#include <m4ri/m4ri_config.h>
#if __M4RI_HAVE_SSE2
#include <emmintrin.h>
#endif
#include <m4ri/misc.h>
/**
* Compute c[i] += t1[i] for 0 <= i < wide
*
*/
static inline void _mzd_combine(word *c, word const *t1, wi_t wide_in) {
wi_t wide = wide_in;
#if __M4RI_HAVE_SSE2
/* assuming c, t1 are alligned the same way */
if (__M4RI_ALIGNMENT(c,16)==8 && wide) {
*c++ ^= *t1++;
wide--;
}
__m128i *__c = (__m128i*)c;
__m128i *__t1 = (__m128i*)t1;
const __m128i *eof = (__m128i*)((unsigned long)(c + wide) & ~0xFUL);
__m128i xmm1;
while(__c < eof-1) {
xmm1 = _mm_xor_si128(*__c, *__t1++);
*__c++ = xmm1;
xmm1 = _mm_xor_si128(*__c, *__t1++);
*__c++ = xmm1;
}
if(__c < eof) {
xmm1 = _mm_xor_si128(*__c, *__t1++);
*__c++ = xmm1;
}
c = (word*)__c;
t1 = (word*)__t1;
wide = ((sizeof(word) * wide) % 16) / sizeof(word);
if(!wide) {
__M4RI_DD_RAWROW(c, wide_in);
return;
}
#endif // __M4RI_HAVE_SSE2
wi_t n = (wide + 7) / 8;
switch (wide % 8) {
case 0: do { *c++ ^= *t1++;
case 7: *c++ ^= *t1++;
case 6: *c++ ^= *t1++;
case 5: *c++ ^= *t1++;
case 4: *c++ ^= *t1++;
case 3: *c++ ^= *t1++;
case 2: *c++ ^= *t1++;
case 1: *c++ ^= *t1++;
} while (--n > 0);
}
__M4RI_DD_RAWROW(c, wide_in);
}
#define N 2
#include "xor_template.h"
#undef N
#define N 3
#include "xor_template.h"
#undef N
#define N 4
#include "xor_template.h"
#undef N
#define N 5
#include "xor_template.h"
#undef N
#define N 6
#include "xor_template.h"
#undef N
#define N 7
#include "xor_template.h"
#undef N
#define N 8
#include "xor_template.h"
#undef N
#endif // M4RI_XOR_H
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