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author | caiyinyu <caiyinyu@loongson.cn> | 2023-09-15 17:35:19 +0800 |
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committer | caiyinyu <caiyinyu@loongson.cn> | 2023-09-19 09:11:49 +0800 |
commit | a53451559dc9cce765ea5bcbb92c4007e058e92b (patch) | |
tree | 4d5b3261a97e362cb36da87962b99a9799a5dc7c /sysdeps/loongarch/dl-tunables.list | |
parent | 5bc9b3a1f6a003f6456f717b590615ea98e2d6fb (diff) | |
download | glibc-a53451559dc9cce765ea5bcbb92c4007e058e92b.tar.gz glibc-a53451559dc9cce765ea5bcbb92c4007e058e92b.tar.xz glibc-a53451559dc9cce765ea5bcbb92c4007e058e92b.zip |
LoongArch: Add glibc.cpu.hwcap support.
Key Points: 1. On lasx & lsx platforms, We must use _dl_runtime_{profile, resolve}_{lsx, lasx} to save vector registers. 2. Via "tunables", users can choose str/mem_{lasx,lsx,unaligned} functions with `export GLIBC_TUNABLES=glibc.cpu.hwcaps=LASX,...`. Note: glibc.cpu.hwcaps doesn't affect _dl_runtime_{profile, resolve}_{lsx, lasx} selection. Usage Notes: 1. Only valid inputs: LASX, LSX, UAL. Case-sensitive, comma-separated, no spaces. 2. Example: `export GLIBC_TUNABLES=glibc.cpu.hwcaps=LASX,UAL` turns on LASX & UAL. Unmentioned features turn off. With default ifunc: lasx > lsx > unaligned > aligned > generic, effect is: lasx > unaligned > aligned > generic; lsx off. 3. Incorrect GLIBC_TUNABLES settings will show error messages. For example: On lsx platforms, you cannot enable lasx features. If you do that, you will get error messages. 4. Valid input examples: - GLIBC_TUNABLES=glibc.cpu.hwcaps=LASX: lasx > aligned > generic. - GLIBC_TUNABLES=glibc.cpu.hwcaps=LSX,UAL: lsx > unaligned > aligned > generic. - GLIBC_TUNABLES=glibc.cpu.hwcaps=LASX,UAL,LASX,UAL,LSX,LASX,UAL: Repetitions allowed but not recommended. Results in: lasx > lsx > unaligned > aligned > generic.
Diffstat (limited to 'sysdeps/loongarch/dl-tunables.list')
-rw-r--r-- | sysdeps/loongarch/dl-tunables.list | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/sysdeps/loongarch/dl-tunables.list b/sysdeps/loongarch/dl-tunables.list new file mode 100644 index 0000000000..66b3427516 --- /dev/null +++ b/sysdeps/loongarch/dl-tunables.list @@ -0,0 +1,25 @@ +# LoongArch specific tunables. +# Copyright (C) 2023 Free Software Foundation, Inc. +# This file is part of the GNU C Library. + +# The GNU C Library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Lesser General Public +# License as published by the Free Software Foundation; either +# version 2.1 of the License, or (at your option) any later version. + +# The GNU C Library is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# Lesser General Public License for more details. + +# You should have received a copy of the GNU Lesser General Public +# License along with the GNU C Library; if not, see +# <http://www.gnu.org/licenses/>. + +glibc { + cpu { + hwcaps { + type: STRING + } + } +} |