| 1 | /* lroundl() - S390 version. |
|---|
| 2 | Copyright (C) 2019-2024 Free Software Foundation, Inc. |
|---|
| 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 | #ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT |
|---|
| 21 | # include <math.h> |
|---|
| 22 | # include <math_private.h> |
|---|
| 23 | # include <libm-alias-ldouble.h> |
|---|
| 24 | |
|---|
| 25 | /* The sizeof (long int) differs between s390x (8byte) and s390 (4byte). |
|---|
| 26 | Thus we need different instructions as the target size is encoded there. |
|---|
| 27 | Note: On s390 this instruction is only used if build with -mzarch. */ |
|---|
| 28 | # ifdef __s390x__ |
|---|
| 29 | # define INSN "cgxbra" |
|---|
| 30 | # else |
|---|
| 31 | # define INSN "cfxbra" |
|---|
| 32 | # endif |
|---|
| 33 | |
|---|
| 34 | long int |
|---|
| 35 | __lroundl (_Float128 x) |
|---|
| 36 | { |
|---|
| 37 | long int y; |
|---|
| 38 | /* The z196 zarch "convert to fixed" (cgxbra) instruction is rounding |
|---|
| 39 | x to the nearest integer with "ties away from 0" rounding mode |
|---|
| 40 | (M3-field: 1) where inexact exceptions are suppressed (M4-field: 4). */ |
|---|
| 41 | __asm__ (INSN " %0,1,%1,4" : "=d" (y) : "f" (x) : "cc" ); |
|---|
| 42 | return y; |
|---|
| 43 | } |
|---|
| 44 | libm_alias_ldouble (__lround, lround) |
|---|
| 45 | |
|---|
| 46 | #else |
|---|
| 47 | # include <sysdeps/ieee754/ldbl-128/s_lroundl.c> |
|---|
| 48 | #endif |
|---|
| 49 | |
|---|
