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23f0d81608
This patch is based on __strcmp_power10.
Improvements from __strncmp_power9:
1. Uses new POWER10 instructions
- This code uses lxvp to decrease contention on load
by loading 32 bytes per instruction.
2. Performance implication
- This version has around 38% better performance on average.
- Minor performance regression is seen for few small sizes
and specific combination of alignments.
Signed-off-by: Amrita H S <amritahs@linux.ibm.com>
Reviewed-by: Peter Bergner <bergner@linux.ibm.com>
50 lines
1.9 KiB
C
50 lines
1.9 KiB
C
/* Multiple versions of strncmp.
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Copyright (C) 2013-2024 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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/* Define multiple versions only for definition in libc. */
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#if defined SHARED && IS_IN (libc)
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# define strncmp __redirect_strncmp
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/* Omit the strncmp inline definitions because it would redefine strncmp. */
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# define __NO_STRING_INLINES
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# include <string.h>
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# include <shlib-compat.h>
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# include "init-arch.h"
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extern __typeof (strncmp) __strncmp_ppc attribute_hidden;
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extern __typeof (strncmp) __strncmp_power8 attribute_hidden;
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# ifdef __LITTLE_ENDIAN__
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extern __typeof (strncmp) __strncmp_power9 attribute_hidden;
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extern __typeof (strncmp) __strncmp_power10 attribute_hidden;
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# endif
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# undef strncmp
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/* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
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ifunc symbol properly. */
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libc_ifunc_redirected (__redirect_strncmp, strncmp,
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# ifdef __LITTLE_ENDIAN__
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(hwcap2 & PPC_FEATURE2_ARCH_3_1
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&& hwcap & PPC_FEATURE_HAS_VSX)
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? __strncmp_power10 :
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(hwcap2 & PPC_FEATURE2_ARCH_3_00
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&& hwcap & PPC_FEATURE_HAS_ALTIVEC)
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? __strncmp_power9 :
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# endif
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(hwcap2 & PPC_FEATURE2_ARCH_2_07)
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? __strncmp_power8
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: __strncmp_ppc);
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#endif
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