]>
Commit | Line | Data |
---|---|---|
9359218f | 1 | /* Compute maximum of two numbers, regarding NaN as missing argument. |
688903eb | 2 | Copyright (C) 2002-2018 Free Software Foundation, Inc. |
9359218f AJ |
3 | This file is part of the GNU C Library. |
4 | Contributed by Andreas Jaeger <aj@suse.de>, 2002. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
9359218f AJ |
19 | |
20 | #include <sysdep.h> | |
011fba7e | 21 | #include <libm-alias-double.h> |
9359218f AJ |
22 | |
23 | .text | |
24 | ENTRY(__fmax) | |
25 | ucomisd %xmm0, %xmm1 | |
26 | jp 1f // jump if unordered | |
27 | maxsd %xmm1, %xmm0 | |
28 | jmp 2f | |
29 | ||
30 | 1: ucomisd %xmm1, %xmm1 // Is xmm1 a NaN? | |
0a2546cd JM |
31 | jp 3f |
32 | // xmm0 is a NaN; xmm1 is not. Test if xmm0 is signaling. | |
33 | movsd %xmm0, -8(%rsp) | |
34 | testb $0x8, -2(%rsp) | |
35 | jz 4f | |
9359218f | 36 | movsd %xmm1, %xmm0 // otherwise return xmm1 |
0a2546cd JM |
37 | ret |
38 | ||
39 | 3: // xmm1 is a NaN; xmm0 may or may not be. | |
40 | ucomisd %xmm0, %xmm0 | |
41 | jp 4f | |
42 | // xmm1 is a NaN; xmm0 is not. Test if xmm1 is signaling. | |
43 | movsd %xmm1, -8(%rsp) | |
44 | testb $0x8, -2(%rsp) | |
45 | jz 4f | |
46 | ret | |
47 | ||
48 | 4: // Both arguments are NaNs, or one is a signaling NaN. | |
49 | addsd %xmm1, %xmm0 | |
9359218f AJ |
50 | |
51 | 2: ret | |
52 | END(__fmax) | |
011fba7e | 53 | libm_alias_double (__fmax, fmax) |