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f10c1654 | 1 | /* llrintf() - S390 version. |
6d7e8eda | 2 | Copyright (C) 2019-2023 Free Software Foundation, Inc. |
f10c1654 SL |
3 | |
4 | This file is part of the GNU C Library. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public License as | |
8 | published by the Free Software Foundation; either version 2.1 of the | |
9 | License, or (at your option) any later version. | |
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 | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, see | |
18 | <https://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #if defined __s390x__ && defined HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT | |
21 | /* We only support s390x as on s390 a long long int refers to a register pair | |
22 | of two 4byte registers instead of a 8byte register which is produced by the | |
23 | instruction. | |
24 | Note: On s390 this instruction would only be used if build with -mzarch. */ | |
25 | # include <math.h> | |
26 | # include <libm-alias-float.h> | |
27 | ||
28 | long long int | |
29 | __llrintf (float x) | |
30 | { | |
31 | long long int y; | |
32 | /* The z196 zarch "convert to fixed" (cgebra) instruction is rounding | |
33 | according to current rounding mode (M3-field: 0). | |
34 | First convert x with suppressed inexact exception and check if the | |
35 | resulting value is beyond the target limits (indicated by cc=3; | |
36 | Note: a nan is also indicated by cc=3). | |
37 | If the resulting value is within the target limits, redo | |
38 | without suppressing the inexact exception. */ | |
39 | __asm__ ("cgebra %0,0,%1,4 \n\t" | |
40 | "jo 1f \n\t" | |
41 | "cgebra %0,0,%1,0 \n\t" | |
42 | "1:" | |
43 | : "=&d" (y) : "f" (x) : "cc"); | |
44 | return y; | |
45 | } | |
46 | libm_alias_float (__llrint, llrint) | |
47 | ||
48 | #else | |
49 | # include <sysdeps/ieee754/flt-32/s_llrintf.c> | |
50 | #endif |