projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 9359218f | 1 | /* Compute maximum of two numbers, regarding NaN as missing argument. |
| dff8da6b | 2 | Copyright (C) 1997-2024 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(__fmaxl) | |
| 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 | fcmovb %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(__fmaxl) |
| f58e5f48 | 58 | libm_alias_ldouble (__fmax, fmax) |