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9359218f | 1 | /* Compute minimum of two numbers, regarding NaN as missing argument. |
581c785b | 2 | Copyright (C) 2002-2022 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> | |
011fba7e | 20 | #include <libm-alias-double.h> |
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21 | |
22 | .text | |
23 | ENTRY(__fmin) | |
24 | ucomisd %xmm0, %xmm1 | |
25 | jp 1f // jump if unordered | |
26 | minsd %xmm1, %xmm0 | |
27 | jmp 2f | |
28 | ||
29 | 1: ucomisd %xmm1, %xmm1 // Is xmm1 a NaN? | |
0a2546cd JM |
30 | jp 3f |
31 | // xmm0 is a NaN; xmm1 is not. Test if xmm0 is signaling. | |
32 | movsd %xmm0, -8(%rsp) | |
33 | testb $0x8, -2(%rsp) | |
34 | jz 4f | |
9359218f | 35 | movsd %xmm1, %xmm0 // otherwise return xmm1 |
0a2546cd JM |
36 | ret |
37 | ||
38 | 3: // xmm1 is a NaN; xmm0 may or may not be. | |
39 | ucomisd %xmm0, %xmm0 | |
40 | jp 4f | |
41 | // xmm1 is a NaN; xmm0 is not. Test if xmm1 is signaling. | |
42 | movsd %xmm1, -8(%rsp) | |
43 | testb $0x8, -2(%rsp) | |
44 | jz 4f | |
45 | ret | |
46 | ||
47 | 4: // Both arguments are NaNs, or one is a signaling NaN. | |
48 | addsd %xmm1, %xmm0 | |
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49 | |
50 | 2: ret | |
51 | END(__fmin) | |
011fba7e | 52 | libm_alias_double (__fmin, fmin) |