mirror of
https://sourceware.org/git/glibc.git
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52cf11004e
Implemented:
wcscat-avx2 (+ 744 bytes
wcscpy-avx2 (+ 539 bytes)
wcpcpy-avx2 (+ 577 bytes)
wcsncpy-avx2 (+1108 bytes)
wcpncpy-avx2 (+1214 bytes)
wcsncat-avx2 (+1085 bytes)
Performance Changes:
Times are from N = 10 runs of the benchmark suite and are reported
as geometric mean of all ratios of New Implementation / Best Old
Implementation. Best Old Implementation was determined with the
highest ISA implementation.
wcscat-avx2 -> 0.975
wcscpy-avx2 -> 0.591
wcpcpy-avx2 -> 0.698
wcsncpy-avx2 -> 0.730
wcpncpy-avx2 -> 0.711
wcsncat-avx2 -> 0.954
Code Size Changes:
This change increase the size of libc.so by ~5.5kb bytes. For
reference the patch optimizing the normal strcpy family functions
decreases libc.so by ~5.2kb.
Full check passes on x86-64 and build succeeds for all ISA levels w/
and w/o multiarch.
42 lines
1.5 KiB
ArmAsm
42 lines
1.5 KiB
ArmAsm
/* ISA level static dispatch for wcsncpy .S files.
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Copyright (C) 2022 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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<https://www.gnu.org/licenses/>. */
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/* wcsncpy non-multiarch build is split into two files,
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wcsncpy-generic.c and wcsncpy.S. The wcsncpy-generic.c build is
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for ISA level <= 1 and just uses multiarch/wcsncpy-generic.c.
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This must be split into two files because we cannot include C
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code from assembly or vice versa. */
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#include <isa-level.h>
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#if MINIMUM_X86_ISA_LEVEL >= 3
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# define WCSNCPY __wcsncpy
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# define DEFAULT_IMPL_V4 "multiarch/wcsncpy-evex.S"
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# define DEFAULT_IMPL_V3 "multiarch/wcsncpy-avx2.S"
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/* isa-default-impl.h expects DEFAULT_IMPL_V1 to be defined but it
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should never be used from here. */
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# define DEFAULT_IMPL_V1 "ERROR -- Invalid ISA IMPL"
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# include "isa-default-impl.h"
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weak_alias (__wcsncpy, wcsncpy)
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libc_hidden_def (__wcsncpy)
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#endif
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