/usr/include/gf2x/gf2x_mul2.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 | /* 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.
*/
/* Implements 128x128 -> 256 bit product using pclmulqdq instruction. */
#ifndef GF2X_MUL2_H_
#define GF2X_MUL2_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
/* Karatsuba with 3 multiplications */
GF2X_STORAGE_CLASS_mul2
void gf2x_mul2(unsigned long * t, unsigned long const * s1,
unsigned long const * s2)
{
__v2di ss1, ss2, s1s, s2s;
__v2di t00, t11, tk;
ss1 = _mm_loadu_si128((__v2di *)s1);
ss2 = _mm_loadu_si128((__v2di *)s2);
t00 = _mm_clmulepi64_si128(ss1, ss2, 0);
t11 = _mm_clmulepi64_si128(ss1, ss2, 17);
s1s = _mm_shuffle_epi32(ss1, 78);
ss1 ^= s1s;
s2s = _mm_shuffle_epi32(ss2, 78);
ss2 ^= s2s;
tk = t00 ^ t11 ^ _mm_clmulepi64_si128(ss1, ss2, 0);
_mm_storeu_si128((__v2di *)t, t00 ^ _mm_slli_si128(tk, 8));
_mm_storeu_si128((__v2di *)(t+2), t11 ^ _mm_srli_si128(tk, 8));
}
#endif /* GF2X_MUL2_H_ */
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