/usr/include/gf2x/gf2x_mul1.h is in libgf2x-dev 1.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 | /* This file is part of the gf2x library.
Copyright 2007, 2008, 2009
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 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.
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 GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along
with this program; see the file COPYING. If not, write to the Free
Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02111-1307, USA.
*/
#ifndef GF2X_MUL1_H_
#define GF2X_MUL1_H_
#include "gf2x.h"
#include "gf2x/gf2x-impl.h"
/* All gf2x source files for lowlevel functions must include gf2x-small.h
* This is mandatory for the tuning mechanism. */
#include "gf2x/gf2x-small.h"
#include <stdint.h>
#include <wmmintrin.h>
#if GF2X_WORDSIZE != 64
#error "This code is for 64-bit only"
#endif
#include "gf2x/gf2x-config.h"
#ifndef HAVE_PCLMUL_SUPPORT
#error "This code needs pclmul support"
#endif
GF2X_STORAGE_CLASS_mul1 void
gf2x_mul1 (unsigned long *c, unsigned long a, unsigned long b)
{
__v2di aa = (__v2di) { a, 0 };
__v2di bb = (__v2di) { b, 0 };
_mm_storeu_si128((__v2di*)c, _mm_clmulepi64_si128(aa, bb, 0));
}
GF2X_STORAGE_CLASS_mul_1_n unsigned long
gf2x_mul_1_n (unsigned long *cp, const unsigned long *bp, long sb, unsigned long a)
{
long i;
typedef union {
__v2di s;
unsigned long x[2];
} __v2di_proxy;
__v2di y = (__v2di) { a, a };
__v2di x;
__v2di_proxy cc;
// do two at a time
for (i = 0; i + 2 < sb; i += 2) {
x = (__v2di) { bp[i], bp[i+1] };
cc.s = _mm_clmulepi64_si128(x, y, 0);
if (i == 0)
cp[i] = cc.x[0];
else
cp[i] ^= cc.x[0];
cp[i+1] = cc.x[1];
cc.s = _mm_clmulepi64_si128(x, y, 1);
cp[i+1] ^= cc.x[0];
cp[i+2] = cc.x[1];
}
// last is different, to handle carry out
unsigned long cy;
if (i == sb - 2) { // case bp is even
x = (__v2di) { bp[i], bp[i+1] };
cc.s = _mm_clmulepi64_si128(x, y, 0);
if (i == 0)
cp[i] = cc.x[0];
else
cp[i] ^= cc.x[0];
cp[i+1] = cc.x[1];
cc.s = _mm_clmulepi64_si128(x, y, 1);
cp[i+1] ^= cc.x[0];
cy = cc.x[1];
} else { //case bp is odd
x = (__v2di) { bp[i], 0 };
cc.s = _mm_clmulepi64_si128(x, y, 0);
if (i == 0)
cp[i] = cc.x[0];
else
cp[i] ^= cc.x[0];
cy = cc.x[1];
}
return cy;
}
GF2X_STORAGE_CLASS_addmul_1_n unsigned long
gf2x_addmul_1_n (unsigned long *dp, const unsigned long *cp, const unsigned long* bp, long sb, unsigned long a)
{
long i;
typedef union {
__v2di s;
unsigned long x[2];
} __v2di_proxy;
__v2di y = (__v2di) { a, a };
__v2di x;
__v2di_proxy dd;
// do two at a time
for (i = 0; i + 2 < sb; i += 2) {
x = (__v2di) { bp[i], bp[i+1] };
dd.s = _mm_clmulepi64_si128(x, y, 0);
if (i == 0)
dp[i] = cp[i] ^ dd.x[0];
else
dp[i] ^= dd.x[0];
dp[i+1] = cp[i+1] ^ dd.x[1];
dd.s = _mm_clmulepi64_si128(x, y, 1);
dp[i+1] ^= dd.x[0];
dp[i+2] = cp[i+2] ^ dd.x[1];
}
unsigned long cy;
if (i == sb - 2) { // case bp is even
x = (__v2di) { bp[i], bp[i+1] };
dd.s = _mm_clmulepi64_si128(x, y, 0);
if (i == 0)
dp[i] = cp[i] ^ dd.x[0];
else
dp[i] ^= dd.x[0];
dp[i+1] = cp[i+1] ^ dd.x[1];
dd.s = _mm_clmulepi64_si128(x, y, 1);
dp[i+1] ^= dd.x[0];
cy = dd.x[1];
} else {
x = (__v2di) { bp[i], 0 };
dd.s = _mm_clmulepi64_si128(x, y, 0);
if (i == 0)
dp[i] = cp[i] ^ dd.x[0];
else
dp[i] ^= dd.x[0];
cy = dd.x[1];
}
return cy;
}
#endif /* GF2X_MUL1_H_ */
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