1  /* Enumerate available IFUNC implementations of a function.  ARM version.
       2     Copyright (C) 2013-2023 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  #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  }