glibc/sysdeps/x86_64/wcscpy-generic.c

/* wcscpy dispatch for RTLD and non-multiarch .c ISA level 1 build.
   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/>.  */

/* wcscpy non-multiarch build is split into two files,
   wcscpy-generic.c and wcscpy.S. The wcscpy-generic.c build is for
   ISA level <= 1 and just uses wcsmbs/wcscpy.c.  This must be split
   into two files because we cannot include C code from assembly or
   vice versa.  */

#include <isa-level.h>

#if MINIMUM_X86_ISA_LEVEL <= 1

# include "wcsmbs/wcscpy.c"

#endif
x86: Add support to build wcscpy with explicit ISA level 1. Add ISA level build guards to different implementations. - wcscpy-ssse3.S is used as ISA level 2/3/4. - wcscpy-generic.c is only used at ISA level 1 and will only build if compiled with ISA level == 1. Otherwise there is no reason to include it as we will always use wcscpy-ssse3.S 2. 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. 2022-07-13 23:33:00 +00:00			`/* wcscpy dispatch for RTLD and non-multiarch .c ISA level 1 build.`
			`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/>. */`

			`/* wcscpy non-multiarch build is split into two files,`
			`wcscpy-generic.c and wcscpy.S. The wcscpy-generic.c build is for`
			`ISA level <= 1 and just uses wcsmbs/wcscpy.c. This must be split`
			`into two files because we cannot include C code from assembly or`
			`vice versa. */`

			`#include <isa-level.h>`

			`#if MINIMUM_X86_ISA_LEVEL <= 1`

			`# include "wcsmbs/wcscpy.c"`

			`#endif`