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a53451559d
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.
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/* Data for LoongArch64 version of processor capability information.
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Linux version.
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* If anything should be added here check whether the size of each string
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is still ok with the given array size.
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All the #ifdefs in the definitions are quite irritating but
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necessary if we want to avoid duplicating the information. There
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are three different modes:
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- PROCINFO_DECL is defined. This means we are only interested in
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declarations.
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- PROCINFO_DECL is not defined:
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+ if SHARED is defined the file is included in an array
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initializer. The .element = { ... } syntax is needed.
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+ if SHARED is not defined a normal array initialization is
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needed.
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*/
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#ifndef PROCINFO_CLASS
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# define PROCINFO_CLASS
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#endif
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#if !IS_IN (ldconfig)
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# if !defined PROCINFO_DECL && defined SHARED
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._dl_larch_cpu_features
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# else
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PROCINFO_CLASS struct cpu_features _dl_larch_cpu_features
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# endif
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# ifndef PROCINFO_DECL
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= { }
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# endif
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# if !defined SHARED || defined PROCINFO_DECL
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;
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# else
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,
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# endif
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#endif
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#undef PROCINFO_DECL
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#undef PROCINFO_CLASS
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