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 #ifdef __STDC__
  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 MASKEDn XCONCAT2(MASKED,N)
  40 #define MASKn XCONCAT2(MASK,N)
  41 #define LSMASKEDn XCONCAT2(LSMASKED,N)
  42 #define LSMASKn XCONCAT2(LSMASK,N)
  43 #define MSMASKEDn XCONCAT2(MSMASKED,N)
  44 #define MSMASKn XCONCAT2(MSMASK,N)
  45 #define EXTRACTEDn XCONCAT2(EXTRACTED,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
  53 INLINE_SIM_BITS\
  54 (unsignedN)
  55 MASKEDn (unsignedN word,
  56          unsigned start,
  57          unsigned stop)
  58 {
  59   return (word & MASKn (start, stop));
  60 }
  61
  62
  63 INLINE_SIM_BITS\
  64 (unsignedN)
  65 LSMASKEDn (unsignedN word,
  66            unsigned nr_bits)
  67 {
  68   return (word & LSMASKn (nr_bits));
  69 }
  70
  71
  72 INLINE_SIM_BITS\
  73 (unsignedN)
  74 MSMASKEDn (unsignedN word,
  75            unsigned nr_bits)
  76 {
  77   return (word & MSMASKn (nr_bits));
  78 }
  79
  80
  81 INLINE_SIM_BITS\
  82 (unsignedN)
  83 EXTRACTEDn (unsignedN val,
  84             unsigned start,
  85             unsigned stop)
  86 {
  87   val <<= _MSB_SHIFT (N, start);
  88   val >>= (_MSB_SHIFT (N, start) + _LSB_SHIFT (N, stop));
  89   return val;
  90 }
  91
  92
  93 INLINE_SIM_BITS\
  94 (unsignedN)
  95 INSERTEDn (unsignedN val,
  96            unsigned start,
  97            unsigned stop)
  98 {
  99   val &= LSMASKn (_MAKE_WIDTH (start, stop));
 100   val <<= _LSB_SHIFT (N, stop);
 101   return val;
 102 }
 103
 104
 105 INLINE_SIM_BITS\
 106 (unsignedN)
 107 ROTn (unsignedN val,
 108       int shift)
 109 {
 110   if (shift > 0)
 111     return ROTRn (val, shift);
 112   else if (shift < 0)
 113     return ROTLn (val, -shift);
 114   else
 115     return val;
 116 }
 117
 118
 119 INLINE_SIM_BITS\
 120 (unsignedN)
 121 ROTLn (unsignedN val,
 122        unsigned shift)
 123 {
 124   unsignedN result;
 125   ASSERT (shift <= N);
 126   result = (((val) << (shift)) | ((val) >> ((N)-(shift))));
 127   return result;
 128 }
 129
 130
 131 INLINE_SIM_BITS\
 132 (unsignedN)
 133 ROTRn (unsignedN val,
 134        unsigned shift)
 135 {
 136   unsignedN result;
 137   ASSERT (shift <= N);
 138   result = (((val) >> (shift)) | ((val) << ((N)-(shift))));
 139   return result;
 140 }
 141
 142
 143 INLINE_SIM_BITS\
 144 (unsignedN)
 145 SEXTn (signedN val,
 146        unsigned sign_bit)
 147 {
 148   /* make the sign-bit most significant and then smear it back into
 149      position */
 150   ASSERT (sign_bit < N);
 151   val <<= _MSB_SHIFT (N, sign_bit);
 152   val >>= _MSB_SHIFT (N, sign_bit);
 153   return val;
 154 }
 155
 156
 157 /* NOTE: See start of file for #define */
 158 #undef SEXTn
 159 #undef ROTLn
 160 #undef ROTRn
 161 #undef ROTn
 162 #undef INSERTEDn
 163 #undef EXTRACTEDn
 164 #undef LSMASKEDn
 165 #undef LSMASKn
 166 #undef MSMASKEDn
 167 #undef MSMASKn
 168 #undef MASKn
 169 #undef MASKEDn
 170 #undef signedN
 171 #undef unsignedN