From ceabdcd130ca7043b0fcf2676183d79431d10493 Mon Sep 17 00:00:00 2001 From: Noah Goldstein Date: Wed, 13 Jul 2022 16:32:59 -0700 Subject: x86: Add support to build strcmp/strlen/strchr with explicit ISA level 1. Add default ISA level selection in non-multiarch/rtld implementations. 2. Add ISA level build guards to different implementations. - I.e strcmp-avx2.S which is ISA level 3 will only build if compiled ISA level <= 3. Otherwise there is no reason to include it as we will always use one of the ISA level 4 implementations (strcmp-evex.S). 3. 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. --- sysdeps/x86_64/wcsncmp-generic.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 sysdeps/x86_64/wcsncmp-generic.c (limited to 'sysdeps/x86_64/wcsncmp-generic.c') diff --git a/sysdeps/x86_64/wcsncmp-generic.c b/sysdeps/x86_64/wcsncmp-generic.c new file mode 100644 index 0000000000..493a6f9b9b --- /dev/null +++ b/sysdeps/x86_64/wcsncmp-generic.c @@ -0,0 +1,29 @@ +/* wcsncmp 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 + . */ + +/* wcsncmp non-multiarch build is split into two files, + wcsncmp-generic.c and wcsncmp.S. The wcsncmp-generic.c build is for + ISA level <= 1 and just uses wcsmbs/wcsncmp.c. This must be split + into two files because we cannot include C code from assembly or + vice versa. */ + +#include + +#if MINIMUM_X86_ISA_LEVEL <= 2 +# include "wcsmbs/wcsncmp.c" +#endif -- cgit v1.2.3-70-g09d2