libgcc/config/gcn/lib2-divmod-di.c

   1 /* Copyright (C) 2021-2024 Free Software Foundation, Inc.
   2    Contributed by Mentor Graphics, Inc.
   3
   4 This file is free software; you can redistribute it and/or modify it
   5 under the terms of the GNU General Public License as published by the
   6 Free Software Foundation; either version 3, or (at your option) any
   7 later version.
   8
   9 This file is distributed in the hope that it will be useful, but
  10 WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 General Public License for more details.
  13
  14 Under Section 7 of GPL version 3, you are granted additional
  15 permissions described in the GCC Runtime Library Exception, version
  16 3.1, as published by the Free Software Foundation.
  17
  18 You should have received a copy of the GNU General Public License and
  19 a copy of the GCC Runtime Library Exception along with this program;
  20 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  21 <http://www.gnu.org/licenses/>.  */
  22
  23 #include "lib2-gcn.h"
  24
  25 /* 64-bit SI divide and modulo as used in gcn.  */
  26
  27 union pack {
  28   UTItype ti;
  29   struct {DItype quot, rem;} pair;
  30 };
  31 union upack {
  32   UTItype ti;
  33   struct {UDItype quot, rem;} pair;
  34 };
  35
  36 UTItype
  37 __udivmoddi4 (UDItype num, UDItype den)
  38 {
  39   UDItype bit = 1;
  40   union upack res = {0};
  41
  42   while (den < num && bit && !(den & (1L<<63)))
  43     {
  44       den <<=1;
  45       bit <<=1;
  46     }
  47   while (bit)
  48     {
  49       if (num >= den)
  50         {
  51           num -= den;
  52           res.pair.quot |= bit;
  53         }
  54       bit >>=1;
  55       den >>=1;
  56     }
  57   res.pair.rem = num;
  58   return res.ti;
  59 }
  60
  61 UTItype
  62 __divmoddi4 (DItype a, DItype b)
  63 {
  64   word_type nega = 0, negb = 0;
  65   union pack res;
  66
  67   if (a < 0)
  68     {
  69       a = -a;
  70       nega = 1;
  71     }
  72
  73   if (b < 0)
  74     {
  75       b = -b;
  76       negb = 1;
  77     }
  78
  79   res.ti = __udivmoddi4 (a, b);
  80
  81   if (nega)
  82     res.pair.rem = -res.pair.rem;
  83   if (nega ^ negb)
  84     res.pair.quot = -res.pair.quot;
  85
  86   return res.ti;
  87 }
  88
  89
  90 DItype
  91 __divdi3 (DItype a, DItype b)
  92 {
  93   union pack u;
  94   u.ti = __divmoddi4 (a, b);
  95   return u.pair.quot;
  96 }
  97
  98 DItype
  99 __moddi3 (DItype a, DItype b)
 100 {
 101   union pack u;
 102   u.ti = __divmoddi4 (a, b);
 103   return u.pair.rem;
 104 }
 105
 106
 107 UDItype
 108 __udivdi3 (UDItype a, UDItype b)
 109 {
 110   union pack u;
 111   u.ti = __udivmoddi4 (a, b);
 112   return u.pair.quot;
 113 }
 114
 115 UDItype
 116 __umoddi3 (UDItype a, UDItype b)
 117 {
 118   union pack u;
 119  u.ti = __udivmoddi4 (a, b);
 120  return u.pair.rem;
 121 }
 122