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9359218f | 1 | /* Compute minimum of two numbers, regarding NaN as missing argument. |
2b778ceb | 2 | Copyright (C) 1997-2021 Free Software Foundation, Inc. |
9359218f | 3 | This file is part of the GNU C Library. |
9359218f AJ |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
9359218f AJ |
18 | |
19 | #include <sysdep.h> | |
f58e5f48 | 20 | #include <libm-alias-ldouble.h> |
9359218f AJ |
21 | |
22 | .text | |
23 | ENTRY(__fminl) | |
24 | fldt 8(%rsp) // x | |
25 | fldt 24(%rsp) // x : y | |
26 | ||
9359218f | 27 | fucomi %st(1), %st |
0a2546cd | 28 | jp 2f |
9359218f AJ |
29 | fcmovnb %st(1), %st |
30 | ||
31 | fstp %st(1) | |
32 | ||
33 | ret | |
0a2546cd JM |
34 | |
35 | 2: // Unordered. | |
36 | fucomi %st(0), %st | |
37 | jp 3f | |
38 | // st(1) is a NaN; st(0) is not. Test if st(1) is signaling. | |
39 | testb $0x40, 15(%rsp) | |
40 | jz 4f | |
41 | fstp %st(1) | |
42 | ret | |
43 | ||
44 | 3: // st(0) is a NaN; st(1) may or may not be. | |
45 | fxch | |
46 | fucomi %st(0), %st | |
47 | jp 4f | |
48 | // st(1) is a NaN; st(0) is not. Test if st(1) is signaling. | |
49 | testb $0x40, 31(%rsp) | |
50 | jz 4f | |
51 | fstp %st(1) | |
52 | ret | |
53 | ||
54 | 4: // Both arguments are NaNs, or one is a signaling NaN. | |
55 | faddp | |
56 | ret | |
9359218f | 57 | END(__fminl) |
f58e5f48 | 58 | libm_alias_ldouble (__fmin, fmin) |