sysdeps/aarch64/multiarch/memmove.c

   1 /* Multiple versions of memmove. AARCH64 version.
   2    Copyright (C) 2017-2024 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_a64fx attribute_hidden;
  35 extern __typeof (__redirect_memmove) __memmove_sve attribute_hidden;
  36 extern __typeof (__redirect_memmove) __memmove_mops attribute_hidden;
  37
  38 static inline __typeof (__redirect_memmove) *
  39 select_memmove_ifunc (void)
  40 {
  41   INIT_ARCH ();
  42
  43   if (mops)
  44     return __memmove_mops;
  45
  46   if (sve && HAVE_AARCH64_SVE_ASM)
  47     {
  48       if (IS_A64FX (midr))
  49         return __memmove_a64fx;
  50       return prefer_sve_ifuncs ? __memmove_sve : __memmove_generic;
  51     }
  52
  53   if (IS_THUNDERX (midr))
  54     return __memmove_thunderx;
  55
  56   if (IS_THUNDERX2 (midr) || IS_THUNDERX2PA (midr))
  57     return __memmove_thunderx2;
  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