| 1 | /* Compute maximum of two numbers, regarding NaN as missing argument. |
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| 2 | Copyright (C) 1997-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <sysdep.h> |
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| 20 | #include <libm-alias-float.h> |
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| 21 | |
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| 22 | .text |
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| 23 | ENTRY(__fmaxf) |
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| 24 | flds 8(%esp) // y |
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| 25 | fxam |
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| 26 | fnstsw |
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| 27 | flds 4(%esp) // y : x |
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| 28 | |
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| 29 | andb $0x45, %ah |
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| 30 | cmpb $0x01, %ah |
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| 31 | je 1f // y == NaN |
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| 32 | |
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| 33 | fucom %st(1) |
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| 34 | fnstsw |
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| 35 | sahf |
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| 36 | jnc 1f |
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| 37 | |
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| 38 | fxch %st(1) |
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| 39 | 1: fstp %st(1) |
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| 40 | |
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| 41 | ret |
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| 42 | END(__fmaxf) |
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| 43 | libm_alias_float (__fmax, fmax) |
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| 44 | |
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