libgcc/config/msp430/msp430-divmod.h

   1 /* libgcc routines for MSP430
   2    Copyright (C) 2005-2016 Free Software Foundation, Inc.
   3    Contributed by Red Hat.
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 3, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    Under Section 7 of GPL version 3, you are granted additional
  18    permissions described in the GCC Runtime Library Exception, version
  19    3.1, as published by the Free Software Foundation.
  20
  21    You should have received a copy of the GNU General Public License and
  22    a copy of the GCC Runtime Library Exception along with this program;
  23    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24    <http://www.gnu.org/licenses/>.  */
  25
  26 UINT_TYPE C3(udivmod,NAME_MODE,4) (UINT_TYPE, UINT_TYPE, word_type);
  27 SINT_TYPE C3(__div,NAME_MODE,3)   (SINT_TYPE, SINT_TYPE);
  28 SINT_TYPE C3(__mod,NAME_MODE,3)   (SINT_TYPE, SINT_TYPE);
  29 UINT_TYPE C3(__udiv,NAME_MODE,3)  (UINT_TYPE, UINT_TYPE);
  30 UINT_TYPE C3(__umod,NAME_MODE,3)  (UINT_TYPE, UINT_TYPE);
  31
  32 UINT_TYPE
  33 C3(udivmod,NAME_MODE,4) (UINT_TYPE num, UINT_TYPE den, word_type modwanted)
  34 {
  35   UINT_TYPE bit = 1;
  36   UINT_TYPE res = 0;
  37
  38   while (den < num && bit && !(den & (1L << BITS_MINUS_1)))
  39     {
  40       den <<= 1;
  41       bit <<= 1;
  42     }
  43   while (bit)
  44     {
  45       if (num >= den)
  46         {
  47           num -= den;
  48           res |= bit;
  49         }
  50       bit >>= 1;
  51       den >>= 1;
  52     }
  53   if (modwanted)
  54     return num;
  55   return res;
  56 }
  57
  58 SINT_TYPE
  59 C3(__div,NAME_MODE,3) (SINT_TYPE a, SINT_TYPE b)
  60 {
  61   word_type neg = 0;
  62   SINT_TYPE res;
  63
  64   if (a < 0)
  65     {
  66       a = -a;
  67       neg = !neg;
  68     }
  69
  70   if (b < 0)
  71     {
  72       b = -b;
  73       neg = !neg;
  74     }
  75
  76   res = C3(udivmod,NAME_MODE,4) (a, b, 0);
  77
  78   if (neg)
  79     res = -res;
  80
  81   return res;
  82 }
  83
  84 SINT_TYPE
  85 C3(__mod,NAME_MODE,3) (SINT_TYPE a, SINT_TYPE b)
  86 {
  87   word_type neg = 0;
  88   SINT_TYPE res;
  89
  90   if (a < 0)
  91     {
  92       a = -a;
  93       neg = 1;
  94     }
  95
  96   if (b < 0)
  97     b = -b;
  98
  99   res = C3(udivmod,NAME_MODE,4) (a, b, 1);
 100
 101   if (neg)
 102     res = -res;
 103
 104   return res;
 105 }
 106
 107 UINT_TYPE
 108 C3(__udiv,NAME_MODE,3) (UINT_TYPE a, UINT_TYPE b)
 109 {
 110   return C3(udivmod,NAME_MODE,4) (a, b, 0);
 111 }
 112
 113 UINT_TYPE
 114 C3(__umod,NAME_MODE,3) (UINT_TYPE a, UINT_TYPE b)
 115 {
 116   return C3(udivmod,NAME_MODE,4) (a, b, 1);
 117 }