/usr/include/gf2x/gf2x_mul3.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 | /* 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_MUL3_H_
#define GF2X_MUL3_H_
#include "gf2x.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 <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
/* TODO: if somebody comes up with a neat way to improve the interface so
* as to remove the false dependency on pclmul, that would be nice.
*/
static inline __v2di
GF2X_FUNC(mul3cl_mul1) (unsigned long a, unsigned long b)
{
__v2di aa = (__v2di) { a, 0 };
__v2di bb = (__v2di) { b, 0 };
return _mm_clmulepi64_si128(aa, bb, 0);
}
/* uses the variant of Karatsuba with 6 multiplications */
GF2X_STORAGE_CLASS_mul3
void gf2x_mul3 (unsigned long *c, const unsigned long *a, const unsigned long *b)
{
unsigned long aa[3], bb[3];
__v2di p0, p1, p2;
__v2di pp0, pp1, pp2;
aa[0] = a[1]^a[2];
aa[1] = a[0]^a[2];
aa[2] = a[0]^a[1];
bb[0] = b[1]^b[2];
bb[1] = b[0]^b[2];
bb[2] = b[0]^b[1];
p0 = GF2X_FUNC(mul3cl_mul1)(a[0], b[0]);
p1 = GF2X_FUNC(mul3cl_mul1)(a[1], b[1]);
p2 = GF2X_FUNC(mul3cl_mul1)(a[2], b[2]);
pp0 = GF2X_FUNC(mul3cl_mul1)(aa[0], bb[0]);
pp1 = GF2X_FUNC(mul3cl_mul1)(aa[1], bb[1]);
pp2 = GF2X_FUNC(mul3cl_mul1)(aa[2], bb[2]);
__v2di ce0, ce2, ce4;
__v2di co1, co3;
ce0 = p0;
ce2 = p0^p1^p2^pp1;
ce4 = p2;
co1 = p0^p1^pp2;
co3 = pp0^p1^p2;
_mm_storeu_si128((__v2di*)(c), ce0 ^ _mm_slli_si128(co1, 8));
_mm_storeu_si128((__v2di*)(c+2), ce2 ^ _mm_srli_si128(co1, 8) ^ _mm_slli_si128(co3, 8));
_mm_storeu_si128((__v2di*)(c+4), ce4 ^ _mm_srli_si128(co3, 8));
}
#endif /* GF2X_MUL3_H_ */
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