1  /* Multiple versions of memmove. 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 memmove so that the compiler won't complain about the type
      23     mismatch with the IFUNC selector in strong_alias, below.  */
      24  # undef memmove
      25  # define memmove __redirect_memmove
      26  # include <string.h>
      27  # include <init-arch.h>
      28  
      29  extern __typeof (__redirect_memmove) __libc_memmove;
      30  
      31  extern __typeof (__redirect_memmove) __memmove_generic attribute_hidden;
      32  extern __typeof (__redirect_memmove) __memmove_thunderx attribute_hidden;
      33  extern __typeof (__redirect_memmove) __memmove_thunderx2 attribute_hidden;
      34  extern __typeof (__redirect_memmove) __memmove_falkor attribute_hidden;
      35  extern __typeof (__redirect_memmove) __memmove_a64fx attribute_hidden;
      36  extern __typeof (__redirect_memmove) __memmove_sve attribute_hidden;
      37  
      38  static inline __typeof (__redirect_memmove) *
      39  select_memmove_ifunc (void)
      40  {
      41    INIT_ARCH ();
      42  
      43    if (sve && HAVE_AARCH64_SVE_ASM)
      44      {
      45        if (IS_A64FX (midr))
      46  	return __memmove_a64fx;
      47        return __memmove_sve;
      48      }
      49  
      50    if (IS_THUNDERX (midr))
      51      return __memmove_thunderx;
      52  
      53    if (IS_THUNDERX2 (midr) || IS_THUNDERX2PA (midr))
      54      return __memmove_thunderx2;
      55  
      56    if (IS_FALKOR (midr) || IS_PHECDA (midr))
      57      return __memmove_falkor;
      58  
      59    return __memmove_generic;
      60  }
      61  
      62  libc_ifunc (__libc_memmove, select_memmove_ifunc ());
      63  
      64  # undef memmove
      65  strong_alias (__libc_memmove, memmove);
      66  #endif