sim/common/sim-bits.c

   1 /*  This file is part of the program psim.
   2
   3     Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program 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
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18
  19     */
  20
  21
  22 #ifndef _SIM_BITS_C_
  23 #define _SIM_BITS_C_
  24
  25 #include "sim-basics.h"
  26 #include "sim-assert.h"
  27 #include "sim-io.h"
  28
  29
  30 INLINE_SIM_BITS\
  31 (unsigned_word)
  32 LSMASKED (unsigned_word val,
  33           int start,
  34           int stop)
  35 {
  36   /* NOTE - start, stop can wrap */
  37   val &= LSMASK (start, stop);
  38   return val;
  39 }
  40
  41
  42 INLINE_SIM_BITS\
  43 (unsigned_word)
  44 MSMASKED (unsigned_word val,
  45           int start,
  46           int stop)
  47 {
  48   /* NOTE - start, stop can wrap */
  49   val &= MSMASK (start, stop);
  50   return val;
  51 }
  52
  53
  54 INLINE_SIM_BITS\
  55 (unsigned_word)
  56 LSEXTRACTED (unsigned_word val,
  57              int start,
  58              int stop)
  59 {
  60   ASSERT (start >= stop);
  61 #if (WITH_TARGET_WORD_BITSIZE == 64)
  62   return LSEXTRACTED64 (val, start, stop);
  63 #endif
  64 #if (WITH_TARGET_WORD_BITSIZE == 32)
  65   if (stop >= 32)
  66     return 0;
  67   else
  68     {
  69       if (start < 32)
  70         val &= LSMASK (start, 0);
  71       val >>= stop;
  72       return val;
  73     }
  74 #endif
  75 }
  76
  77
  78 INLINE_SIM_BITS\
  79 (unsigned_word)
  80 MSEXTRACTED (unsigned_word val,
  81              int start,
  82              int stop)
  83 {
  84   ASSERT (start <= stop);
  85 #if (WITH_TARGET_WORD_BITSIZE == 64)
  86   return MSEXTRACTED64 (val, start, stop);
  87 #endif
  88 #if (WITH_TARGET_WORD_BITSIZE == 32)
  89   if (stop < 32)
  90     return 0;
  91   else
  92     {
  93       if (start >= 32)
  94         val &= MSMASK (start, 64 - 1);
  95       val >>= (64 - stop - 1);
  96       return val;
  97     }
  98 #endif
  99 }
 100
 101
 102 INLINE_SIM_BITS\
 103 (unsigned_word)
 104 INSERTED (unsigned_word val,
 105           int start,
 106           int stop)
 107 {
 108   ASSERT ((WITH_TARGET_WORD_MSB == 0 && start <= stop)
 109           || (WITH_TARGET_WORD_MSB != 0 && start >= stop));
 110 #if (WITH_TARGET_WORD_BITSIZE == 64)
 111   return INSERTED64 (val, start, stop);
 112 #endif
 113 #if (WITH_TARGET_WORD_BITSIZE == 32)
 114   /* Bit numbers are 0..63, even for 32 bit targets.
 115      On 32 bit targets we ignore 0..31.  */
 116   if (_LSB_SHIFT (64, stop) >= 32)
 117     return 0;
 118   else
 119     {
 120       val &= LSMASK (_MAKE_WIDTH (start, stop), 0);
 121       val <<= _LSB_SHIFT (64, stop);
 122       return val;
 123     }
 124 #endif
 125 }
 126
 127
 128
 129 INLINE_SIM_BITS\
 130 (unsigned_word)
 131 SEXT (signed_word val,
 132       int sign_bit)
 133 {
 134   /* make the sign-bit most significant and then smear it back into
 135      position */
 136   ASSERT (sign_bit < 64);
 137 #if (WITH_TARGET_WORD_BITSIZE == 64)
 138   return SEXT64 (val, sign_bit);
 139 #endif
 140 #if (WITH_TARGET_WORD_BITSIZE == 32)
 141   if (_MSB_SHIFT (64, sign_bit) < 32)
 142     return val;
 143   else {
 144     val <<= (_MSB_SHIFT (64, sign_bit) - 32);
 145     val >>= (_MSB_SHIFT (64, sign_bit) - 32);
 146     return val;
 147   }
 148 #endif
 149 }
 150
 151
 152
 153 #define N 16
 154 #include "sim-n-bits.h"
 155 #undef N
 156
 157 #define N 32
 158 #include "sim-n-bits.h"
 159 #undef N
 160
 161 #define N 64
 162 #include "sim-n-bits.h"
 163 #undef N
 164
 165 #endif /* _SIM_BITS_C_ */