blob: eb96485ed939ccc09c378e184c3a2a83fec80717 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* IEEE754 floating point arithmetic
2 * double precision: common utilities
3 */
4/*
5 * MIPS floating point support
6 * Copyright (C) 1994-2000 Algorithmics Ltd.
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * This program is free software; you can distribute it and/or modify it
9 * under the terms of the GNU General Public License (Version 2) as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
Ralf Baechle3f7cac42014-04-26 01:49:14 +020019 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 */
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include "ieee754dp.h"
23
Ralf Baechle2209bcb2014-04-16 01:31:11 +020024union ieee754dp ieee754dp_neg(union ieee754dp x)
Linus Torvalds1da177e2005-04-16 15:20:36 -070025{
Maciej W. Rozycki232b6ec2015-04-03 23:27:43 +010026 union ieee754dp y;
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
Maciej W. Rozycki198f7052015-11-13 00:47:08 +000028 if (ieee754_csr.abs2008) {
29 y = x;
30 DPSIGN(y) = !DPSIGN(x);
31 } else {
32 unsigned int oldrm;
33
34 oldrm = ieee754_csr.rm;
35 ieee754_csr.rm = FPU_CSR_RD;
36 y = ieee754dp_sub(ieee754dp_zero(0), x);
37 ieee754_csr.rm = oldrm;
38 }
Maciej W. Rozycki232b6ec2015-04-03 23:27:43 +010039 return y;
Linus Torvalds1da177e2005-04-16 15:20:36 -070040}
41
Ralf Baechle2209bcb2014-04-16 01:31:11 +020042union ieee754dp ieee754dp_abs(union ieee754dp x)
Linus Torvalds1da177e2005-04-16 15:20:36 -070043{
Maciej W. Rozycki232b6ec2015-04-03 23:27:43 +010044 union ieee754dp y;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Maciej W. Rozycki198f7052015-11-13 00:47:08 +000046 if (ieee754_csr.abs2008) {
47 y = x;
48 DPSIGN(y) = 0;
49 } else {
50 unsigned int oldrm;
51
52 oldrm = ieee754_csr.rm;
53 ieee754_csr.rm = FPU_CSR_RD;
54 if (DPSIGN(x))
55 y = ieee754dp_sub(ieee754dp_zero(0), x);
56 else
57 y = ieee754dp_add(ieee754dp_zero(0), x);
58 ieee754_csr.rm = oldrm;
59 }
Maciej W. Rozycki232b6ec2015-04-03 23:27:43 +010060 return y;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061}