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