sysdeps/aarch64/multiarch/memset.c

   1 /* Multiple versions of memset. AARCH64 version.
   2    Copyright (C) 2017-2024 Free Software Foundation, Inc.
   3    Copyright The GNU Toolchain Authors.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 /* Define multiple versions only for the definition in libc.  */
  21
  22 #if IS_IN (libc)
  23 /* Redefine memset so that the compiler won't complain about the type
  24    mismatch with the IFUNC selector in strong_alias, below.  */
  25 # undef memset
  26 # define memset __redirect_memset
  27 # include <string.h>
  28 # include <init-arch.h>
  29
  30 extern __typeof (__redirect_memset) __libc_memset;
  31
  32 extern __typeof (__redirect_memset) __memset_zva64 attribute_hidden;
  33 extern __typeof (__redirect_memset) __memset_emag attribute_hidden;
  34 extern __typeof (__redirect_memset) __memset_kunpeng attribute_hidden;
  35 extern __typeof (__redirect_memset) __memset_a64fx attribute_hidden;
  36 extern __typeof (__redirect_memset) __memset_generic attribute_hidden;
  37 extern __typeof (__redirect_memset) __memset_mops attribute_hidden;
  38 extern __typeof (__redirect_memset) __memset_oryon1 attribute_hidden;
  39
  40 static inline __typeof (__redirect_memset) *
  41 select_memset_ifunc (void)
  42 {
  43   INIT_ARCH ();
  44
  45   if (mops)
  46     return __memset_mops;
  47
  48   if (sve && HAVE_AARCH64_SVE_ASM)
  49     {
  50       if (IS_A64FX (midr) && zva_size == 256)
  51         return __memset_a64fx;
  52     }
  53
  54   if (IS_ORYON1 (midr) && zva_size == 64)
  55     return __memset_oryon1;
  56
  57   if (IS_KUNPENG920 (midr))
  58     return __memset_kunpeng;
  59
  60   if (IS_EMAG (midr))
  61     return __memset_emag;
  62
  63   if (zva_size == 64)
  64     return __memset_zva64;
  65
  66   return __memset_generic;
  67 }
  68
  69 libc_ifunc (__libc_memset, select_memset_ifunc ());
  70
  71 # undef memset
  72 strong_alias (__libc_memset, memset);
  73 #endif