sysdeps/arm/armv7/multiarch/ifunc-impl-list.c

   1 /* Enumerate available IFUNC implementations of a function.  ARM version.
   2    Copyright (C) 2013-2024 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 #include <stdbool.h>
  20 #include <string.h>
  21 #include <ldsodefs.h>
  22 #include <sysdep.h>
  23 #include <ifunc-impl-list.h>
  24
  25 /* Fill ARRAY of MAX elements with IFUNC implementations for function
  26    NAME and return the number of valid entries.  */
  27
  28 size_t
  29 __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
  30                         size_t max)
  31 {
  32   size_t i = max;
  33
  34   bool use_neon = true;
  35 #ifdef __ARM_NEON__
  36 # define __memcpy_neon  memcpy
  37 # define __memchr_neon  memchr
  38 #else
  39   use_neon = (GLRO(dl_hwcap) & HWCAP_ARM_NEON) != 0;
  40 #endif
  41
  42 #ifndef __ARM_NEON__
  43   bool use_vfp = true;
  44 # ifdef __SOFTFP__
  45   use_vfp = (GLRO(dl_hwcap) & HWCAP_ARM_VFP) != 0;
  46 # endif
  47 #endif
  48
  49   IFUNC_IMPL (i, name, memcpy,
  50               IFUNC_IMPL_ADD (array, i, memcpy, use_neon, __memcpy_neon)
  51 #ifndef __ARM_NEON__
  52               IFUNC_IMPL_ADD (array, i, memcpy, use_vfp, __memcpy_vfp)
  53 #endif
  54               IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_arm));
  55
  56   IFUNC_IMPL (i, name, memchr,
  57               IFUNC_IMPL_ADD (array, i, memchr, use_neon, __memchr_neon)
  58               IFUNC_IMPL_ADD (array, i, memchr, 1, __memchr_noneon));
  59
  60   return 0;
  61 }