sysdeps/aarch64/multiarch/memset.c

   1 /* Multiple versions of memset. AARCH64 version.
   2    Copyright (C) 2017-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 /* Define multiple versions only for the definition in libc.  */
  20
  21 #if IS_IN (libc)
  22 /* Redefine memset so that the compiler won't complain about the type
  23    mismatch with the IFUNC selector in strong_alias, below.  */
  24 # undef memset
  25 # define memset __redirect_memset
  26 # include <string.h>
  27 # include <init-arch.h>
  28
  29 extern __typeof (__redirect_memset) __libc_memset;
  30
  31 extern __typeof (__redirect_memset) __memset_falkor attribute_hidden;
  32 extern __typeof (__redirect_memset) __memset_emag attribute_hidden;
  33 extern __typeof (__redirect_memset) __memset_kunpeng attribute_hidden;
  34 extern __typeof (__redirect_memset) __memset_a64fx attribute_hidden;
  35 extern __typeof (__redirect_memset) __memset_generic attribute_hidden;
  36
  37 static inline __typeof (__redirect_memset) *
  38 select_memset_ifunc (void)
  39 {
  40   INIT_ARCH ();
  41
  42   if (sve && HAVE_AARCH64_SVE_ASM)
  43     {
  44       if (IS_A64FX (midr) && zva_size == 256)
  45         return __memset_a64fx;
  46       return __memset_generic;
  47     }
  48
  49   if (IS_KUNPENG920 (midr))
  50     return __memset_kunpeng;
  51
  52   if ((IS_FALKOR (midr) || IS_PHECDA (midr)) && zva_size == 64)
  53     return __memset_falkor;
  54
  55   if (IS_EMAG (midr) && zva_size == 64)
  56     return __memset_emag;
  57
  58   return __memset_generic;
  59 }
  60
  61 libc_ifunc (__libc_memset, select_memset_ifunc ());
  62
  63 # undef memset
  64 strong_alias (__libc_memset, memset);
  65 #endif