1  /* Shift unaligned word read.  Alpha version.
       2     Copyright (C) 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     <http://www.gnu.org/licenses/>.  */
      18  
      19  #ifndef _STRING_SHIFT_H
      20  #define _STRING_SHIFT_H 1
      21  
      22  #include <limits.h>
      23  #include <stdint.h>
      24  #include <string-fza.h>
      25  
      26  /* Return the mask WORD shifted based on S_INT address value, to ignore
      27     values not presented in the aligned word read.  */
      28  static __always_inline find_t
      29  shift_find (find_t word, uintptr_t s)
      30  {
      31    return word >> (s % sizeof (op_t));
      32  }
      33  
      34  /* Mask off the bits defined the the S alignment value.  */
      35  static __always_inline find_t
      36  shift_find_last (find_t word, uintptr_t s)
      37  {
      38    s = s % sizeof (op_t);
      39    if (s == 0)
      40      return word;
      41    return word & ~((op_t)-1 << s);
      42  }
      43  
      44  #endif /* _STRING_SHIFT_H */