chiark / gitweb /
math/mpx-mul4-x86-sse2.S: Use `SHUF' instead of hardwired constants.
[catacomb] / math / field.c
CommitLineData
2685767a 1/* -*-c-*-
dbfee00a 2 *
3 * Abstract field operations
2685767a 4 *
2685767a 5 * (c) 2001 Straylight/Edgeware
6 */
7
45c0fd36 8/*----- Licensing notice --------------------------------------------------*
2685767a 9 *
10 * This file is part of Catacomb.
11 *
12 * Catacomb is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Library General Public License as
14 * published by the Free Software Foundation; either version 2 of the
15 * License, or (at your option) any later version.
45c0fd36 16 *
2685767a 17 * Catacomb is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Library General Public License for more details.
45c0fd36 21 *
2685767a 22 * You should have received a copy of the GNU Library General Public
23 * License along with Catacomb; if not, write to the Free
24 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
25 * MA 02111-1307, USA.
26 */
27
2685767a 28/*----- Header files ------------------------------------------------------*/
29
30#include "field.h"
31#include "mp.h"
32
33/*----- Main code ---------------------------------------------------------*/
34
35/* --- @field_id@ --- *
36 *
37 * Arguments: @field *f@ = pointer to a field
38 * @mp *d@ = a destination element
39 * @mp *x@ = a source element
40 *
41 * Returns: The result element.
42 *
43 * Use: An identity operation which can be used if your field has no
44 * internal representation.
45 */
46
47mp *field_id(field *f, mp *d, mp *x)
1256557a 48 { x = MP_COPY(x); if (d) MP_DROP(d); return (x); }
2685767a 49
34e4f738 50/* --- @field_samep@ --- *
51 *
52 * Arguments: @field *f, *g@ = two fields
53 *
54 * Returns: Nonzero if the fields are identical (not just isomorphic).
55 *
56 * Use: Checks for sameness of fields. This function does the full
57 * check, not just the field-type-specific check done by the
58 * @sampep@ field operation.
59 */
60
61int field_samep(field *f, field *g)
1256557a 62 { return (f == g || (f->ops == g->ops && F_SAMEP(f, g))); }
34e4f738 63
64/* --- @field_stdsamep@ --- *
65 *
66 * Arguments: @field *f, *g@ = two fields
67 *
68 * Returns: Nonzero if the fields are identical (not just isomorphic).
69 *
70 * Use: Standard sameness check, based on equality of the @m@
71 * member.
72 */
73
1256557a 74int field_stdsamep(field *f, field *g) { return (MP_EQ(f->m, g->m)); }
34e4f738 75
2685767a 76/*----- That's all, folks -------------------------------------------------*/