/usr/include/gf2x/gf2x_mul4.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 | /* 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_MUL4_H_
#define GF2X_MUL4_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 <emmintrin.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 void
GF2X_FUNC(mul4clk_mul2)(__v2di * t, __v2di ss1, __v2di ss2)
{
typedef union {
__v2di s;
unsigned long x[2];
} __v2di_proxy;
__v2di_proxy t00, t11, tk;
t00.s = _mm_clmulepi64_si128(ss1, ss2, 0);
t11.s = _mm_clmulepi64_si128(ss1, ss2, 17);
ss1 ^= _mm_shuffle_epi32(ss1, 78); // 78 == 0b01001110 (swap)
ss2 ^= _mm_shuffle_epi32(ss2, 78); // 78 == 0b01001110 (swap)
tk.s = _mm_clmulepi64_si128(ss1, ss2, 0);
tk.s ^= t00.s ^ t11.s;
t00.x[1] ^= tk.x[0];
t11.x[0] ^= tk.x[1];
t[0] = t00.s;
t[1] = t11.s;
}
/* specialized Karatsuba with 3 calls to mul2, i.e., 9 multiplications */
GF2X_STORAGE_CLASS_mul4
void gf2x_mul4 (unsigned long *c, const unsigned long *a, const unsigned long *b)
{
__v2di ab[2];
__v2di lo[2], hi[2];
__v2di a0 = _mm_loadu_si128((__v2di*)a);
__v2di a2 = _mm_loadu_si128((__v2di*)(a+2));
__v2di b0 = _mm_loadu_si128((__v2di*)b);
__v2di b2 = _mm_loadu_si128((__v2di*)(b+2));
GF2X_FUNC(mul4clk_mul2)(lo, a0, b0);
GF2X_FUNC(mul4clk_mul2)(hi, a2, b2);
__v2di middle = lo[1] ^ hi[0];
GF2X_FUNC(mul4clk_mul2)(ab, a0 ^ a2, b0 ^ b2);
_mm_storeu_si128((__v2di*)(c + 0), lo[0]);
_mm_storeu_si128((__v2di*)(c + 2), ab[0] ^ lo[0] ^ middle);
_mm_storeu_si128((__v2di*)(c + 4), ab[1] ^ hi[1] ^ middle);
_mm_storeu_si128((__v2di*)(c + 6), hi[1]);
}
#endif /* GF2X_MUL4_H_ */
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