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  1. /*-------------------------------------------------------------------------
  2.    _rrulonglong.c - routine for right shift of 64 bit unsigned long long
  3.  
  4.    Copyright (C) 2012, Philipp Klaus Krause . philipp@informatik.uni-frankfurt.de
  5.  
  6.    This library is free software; you can redistribute it and/or modify it
  7.    under the terms of the GNU General Public License as published by the
  8.    Free Software Foundation; either version 2, or (at your option) any
  9.    later version.
  10.  
  11.    This library is distributed in the hope that it will be useful,
  12.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14.    GNU General Public License for more details.
  15.  
  16.    You should have received a copy of the GNU General Public License
  17.    along with this library; see the file COPYING. If not, write to the
  18.    Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
  19.    MA 02110-1301, USA.
  20.  
  21.    As a special exception, if you link this library with other files,
  22.    some of which are compiled with SDCC, to produce an executable,
  23.    this library does not by itself cause the resulting executable to
  24.    be covered by the GNU General Public License. This exception does
  25.    not however invalidate any other reasons why the executable file
  26.    might be covered by the GNU General Public License.
  27. -------------------------------------------------------------------------*/
  28.  
  29. #pragma std_c99
  30.  
  31. #include <stdint.h>
  32.  
  33. #ifdef __SDCC_LONGLONG
  34. // This function is the same as the one from rrslonglong_rrx_s.c, except for the type of top, and b[0/3].
  35.  
  36. #if defined(__SDCC_hc08) || defined(__SDCC_s08) || defined(__SDCC_stm8) // Big-endian
  37.  
  38. unsigned long long _rrulonglong(unsigned long long l, char s)
  39. {
  40.         uint32_t *const top = (uint32_t *)((char *)(&l) + 0);
  41.         uint32_t *const middle = (uint16_t *)((char *)(&l) + 2);
  42.         uint32_t *const bottom = (uint32_t *)((char *)(&l) + 4);
  43.         uint16_t *const b = (uint16_t *)(&l);
  44.  
  45.         for(;s >= 16; s -= 16)
  46.         {
  47.                 b[3] = b[2];
  48.                 b[2] = b[1];
  49.                 b[1] = b[0];
  50.                 b[0] = 0x000000;
  51.         }
  52.  
  53.         (*bottom) >>= s;
  54.         (*middle) |= (((*middle & 0xffff0000ul) >> s) & 0x0000fffful);
  55.         (*top) >>= s;
  56.  
  57.         return(l);
  58. }
  59.  
  60. #else // Little-endian
  61.  
  62. unsigned long long _rrulonglong(unsigned long long l, char s)
  63. {
  64.         uint32_t *const top = (uint32_t *)((char *)(&l) + 4);
  65.         uint16_t *const middle = (uint16_t *)((char *)(&l) + 4);
  66.         uint32_t *const bottom = (uint32_t *)(&l);
  67.         uint16_t *const b = (uint16_t *)(&l);
  68.  
  69.         for(;s >= 16; s -= 16)
  70.         {
  71.                 b[0] = b[1];
  72.                 b[1] = b[2];
  73.                 b[2] = b[3];
  74.                 b[3] = 0x000000;
  75.         }
  76.  
  77.         (*bottom) >>= s;
  78.         (*middle) |= (uint16_t)(((uint32_t)(*middle) << 16) >> s);
  79.         (*top) |= (((*middle) & 0xffff0000ul) >> s);
  80.  
  81.         return(l);
  82. }
  83.  
  84. #endif
  85.  
  86. #endif
  87.  
  88.