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6973fc01 | 1 | /* Compute minimum of two numbers, regarding NaN as missing argument. |
688903eb | 2 | Copyright (C) 1997-2018 Free Software Foundation, Inc. |
6973fc01 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
6973fc01 UD |
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 | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
6973fc01 | 15 | |
41bdb6e2 | 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/>. */ | |
6973fc01 | 19 | |
2ce30701 | 20 | #include <libm-alias-ldouble.h> |
6973fc01 UD |
21 | #include <sysdep.h> |
22 | ||
23 | .text | |
24 | ENTRY(__fminl) | |
0a2546cd JM |
25 | fldt 16(%esp) // y |
26 | fxam | |
27 | fnstsw | |
28 | fldt 4(%esp) // y : x | |
29 | ||
30 | andb $0x45, %ah | |
31 | cmpb $0x01, %ah | |
32 | je 2f // y == NaN | |
6973fc01 UD |
33 | |
34 | fxam | |
35 | fnstsw | |
36 | andb $0x45, %ah | |
37 | cmpb $0x01, %ah | |
0a2546cd | 38 | je 3f // x == NaN |
6973fc01 UD |
39 | |
40 | fucom %st(1) | |
41 | fnstsw | |
42 | sahf | |
0a2546cd JM |
43 | jc 1f |
44 | ||
45 | fxch %st(1) | |
46 | 1: fstp %st(1) | |
47 | ||
48 | ret | |
6973fc01 | 49 | |
0a2546cd JM |
50 | 2: // st(1) is a NaN; st(0) may or may not be. |
51 | fxam | |
52 | fnstsw | |
53 | andb $0x45, %ah | |
54 | cmpb $0x01, %ah | |
55 | je 4f | |
56 | // st(1) is a NaN; st(0) is not. Test if st(1) is signaling. | |
57 | testb $0x40, 23(%esp) | |
58 | jz 4f | |
59 | fstp %st(1) | |
60 | ret | |
61 | ||
62 | 3: // st(0) is a NaN; st(1) is not. Test if st(0) is signaling. | |
63 | testb $0x40, 11(%esp) | |
64 | jz 4f | |
65 | fstp %st(0) | |
66 | ret | |
6973fc01 | 67 | |
0a2546cd JM |
68 | 4: // Both arguments are NaNs, or one is a signaling NaN. |
69 | faddp | |
6973fc01 UD |
70 | ret |
71 | END(__fminl) | |
2ce30701 | 72 | libm_alias_ldouble (__fmin, fmin) |