sim/common/sim-n-bits.h

   1 /*  This file is part of the program psim.
   2
   3     Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au>
   4     Copyright (C) 1997, Free Software Foundation, Inc.
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program 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 program; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19
  20     */
  21
  22
  23 #ifndef N
  24 #error "N must be #defined"
  25 #endif
  26
  27 #include "sim-xcat.h"
  28
  29 #if defined(__STDC__) && defined(signed)
  30 /* If signed were defined to be say __signed (ie, some versions of Linux),
  31    then the signedN macro would not work correctly.  If we have a standard
  32    compiler, we have signed.  */
  33 #undef signed
  34 #endif
  35
  36 /* NOTE: See end of file for #undef */
  37 #define unsignedN XCONCAT2(unsigned,N)
  38 #define signedN XCONCAT2(signed,N)
  39 #define MASKn XCONCAT2(MASK,N)
  40 #define LSMASKEDn XCONCAT2(LSMASKED,N)
  41 #define LSMASKn XCONCAT2(LSMASK,N)
  42 #define MSMASKEDn XCONCAT2(MSMASKED,N)
  43 #define MSMASKn XCONCAT2(MSMASK,N)
  44 #define LSEXTRACTEDn XCONCAT2(LSEXTRACTED,N)
  45 #define MSEXTRACTEDn XCONCAT2(MSEXTRACTED,N)
  46 #define INSERTEDn XCONCAT2(INSERTED,N)
  47 #define ROTn XCONCAT2(ROT,N)
  48 #define ROTLn XCONCAT2(ROTL,N)
  49 #define ROTRn XCONCAT2(ROTR,N)
  50 #define SEXTn XCONCAT2(SEXT,N)
  51
  52 /* TAGS: LSMASKED16 LSMASKED32 LSMASKED64 */
  53
  54 INLINE_SIM_BITS\
  55 (unsignedN)
  56 LSMASKEDn (unsignedN word,
  57            int start,
  58            int stop)
  59 {
  60   word &= LSMASKn (start, stop);
  61   return word;
  62 }
  63
  64 /* TAGS: MSMASKED16 MSMASKED32 MSMASKED64 */
  65
  66 INLINE_SIM_BITS\
  67 (unsignedN)
  68 MSMASKEDn (unsignedN word,
  69            int start,
  70            int stop)
  71 {
  72   word &= MSMASKn (start, stop);
  73   return word;
  74 }
  75
  76 /* TAGS: LSEXTRACTED16 LSEXTRACTED32 LSEXTRACTED64 */
  77
  78 INLINE_SIM_BITS\
  79 (unsignedN)
  80 LSEXTRACTEDn (unsignedN val,
  81               int start,
  82               int stop)
  83 {
  84   val <<= (N - 1 - start); /* drop high bits */
  85   val >>= (N - 1 - start) + (stop); /* drop low bits */
  86   return val;
  87 }
  88
  89 /* TAGS: MSEXTRACTED16 MSEXTRACTED32 MSEXTRACTED64 */
  90
  91 INLINE_SIM_BITS\
  92 (unsignedN)
  93 MSEXTRACTEDn (unsignedN val,
  94               int start,
  95               int stop)
  96 {
  97   val <<= (start); /* drop high bits */
  98   val >>= (start) + (N - 1 - stop); /* drop low bits */
  99   return val;
 100 }
 101
 102 /* TAGS: INSERTED16 INSERTED32 INSERTED64 */
 103
 104 INLINE_SIM_BITS\
 105 (unsignedN)
 106 INSERTEDn (unsignedN val,
 107            int start,
 108            int stop)
 109 {
 110   val <<= _LSB_SHIFT (N, stop);
 111   val &= MASKn (start, stop);
 112   return val;
 113 }
 114
 115 /* TAGS: ROT16 ROT32 ROT64 */
 116
 117 INLINE_SIM_BITS\
 118 (unsignedN)
 119 ROTn (unsignedN val,
 120       int shift)
 121 {
 122   if (shift > 0)
 123     return ROTRn (val, shift);
 124   else if (shift < 0)
 125     return ROTLn (val, -shift);
 126   else
 127     return val;
 128 }
 129
 130 /* TAGS: ROTL16 ROTL32 ROTL64 */
 131
 132 INLINE_SIM_BITS\
 133 (unsignedN)
 134 ROTLn (unsignedN val,
 135        int shift)
 136 {
 137   unsignedN result;
 138   ASSERT (shift <= N);
 139   result = (((val) << (shift)) | ((val) >> ((N)-(shift))));
 140   return result;
 141 }
 142
 143 /* TAGS: ROTR16 ROTR32 ROTR64 */
 144
 145 INLINE_SIM_BITS\
 146 (unsignedN)
 147 ROTRn (unsignedN val,
 148        int shift)
 149 {
 150   unsignedN result;
 151   ASSERT (shift <= N);
 152   result = (((val) >> (shift)) | ((val) << ((N)-(shift))));
 153   return result;
 154 }
 155
 156 /* TAGS: SEXT16 SEXT32 SEXT64 */
 157
 158 INLINE_SIM_BITS\
 159 (unsignedN)
 160 SEXTn (signedN val,
 161        int sign_bit)
 162 {
 163   /* make the sign-bit most significant and then smear it back into
 164      position */
 165   ASSERT (sign_bit < N);
 166   val <<= _MSB_SHIFT (N, sign_bit);
 167   val >>= _MSB_SHIFT (N, sign_bit);
 168   return val;
 169 }
 170
 171
 172 /* NOTE: See start of file for #define */
 173 #undef SEXTn
 174 #undef ROTLn
 175 #undef ROTRn
 176 #undef ROTn
 177 #undef INSERTEDn
 178 #undef LSEXTRACTEDn
 179 #undef MSEXTRACTEDn
 180 #undef LSMASKEDn
 181 #undef LSMASKn
 182 #undef MSMASKEDn
 183 #undef MSMASKn
 184 #undef MASKn
 185 #undef MASKEDn
 186 #undef signedN
 187 #undef unsignedN