glibc/sysdeps/x86_64/varshift.c

/* Hook for build varshift for non-multiarch build.  Needed for the
   ISA level >= 2 because strspn-sse4, strcspn-sse4, and strpbrk-sse4
   all have a dependency on varshift.c.
   Copyright (C) 2022 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
   <https://www.gnu.org/licenses/>.  */


#include <isa-level.h>

#if MINIMUM_X86_ISA_LEVEL >= 2
# include "multiarch/varshift.c"
#endif
x86: Add support for building str{c\|p}{brk\|spn} with explicit ISA level The changes for these functions are different than the others because the best implementation (sse4_2) requires the generic implementation as a fallback to be built as well. Changes are: 1. Add non-multiarch functions for str{c\|p}{brk\|spn}.c to statically select the best implementation based on the configured ISA build level. 2. Add stubs for str{c\|p}{brk\|spn}-generic and varshift.c to in the sysdeps/x86_64 directory so that the the sse4 implementation will have all of its dependencies for the non-multiarch / rtld build when ISA level >= 2. 3. Add new multiarch/rtld-strcspn.c that just include the non-multiarch strcspn.c which will in turn select the best implementation based on the compiled ISA level. 4. Refactor the ifunc selector and ifunc implementation list to use the ISA level aware wrapper macros that allow functions below the compiled ISA level (with a guranteed replacement) to be skipped. Tested with and without multiarch on x86_64 for ISA levels: {generic, x86-64-v2, x86-64-v3, x86-64-v4} And m32 with and without multiarch. 2022-07-04 04:28:07 +00:00			`/* Hook for build varshift for non-multiarch build. Needed for the`
			`ISA level >= 2 because strspn-sse4, strcspn-sse4, and strpbrk-sse4`
			`all have a dependency on varshift.c.`
			`Copyright (C) 2022 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`
			`<https://www.gnu.org/licenses/>. */`


			`#include <isa-level.h>`

			`#if MINIMUM_X86_ISA_LEVEL >= 2`
			`# include "multiarch/varshift.c"`
			`#endif`