gcc/genattr.c

   1 /* Generate attribute information (insn-attr.h) from machine description.
   2    Copyright (C) 1991, 1994, 1996, 1998, 1999, 2000 Free Software Foundation, Inc.
   3    Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22
  23 #include "hconfig.h"
  24 #include "system.h"
  25 #include "rtl.h"
  26 #include "errors.h"
  27 #include "gensupport.h"
  28
  29
  30 /* A range of values.  */
  31
  32 struct range
  33 {
  34   int min;
  35   int max;
  36 };
  37
  38 /* Record information about each function unit mentioned in a
  39    DEFINE_FUNCTION_UNIT.  */
  40
  41 struct function_unit
  42 {
  43   char *name;                   /* Function unit name.  */
  44   struct function_unit *next;   /* Next function unit.  */
  45   int multiplicity;             /* Number of units of this type.  */
  46   int simultaneity;             /* Maximum number of simultaneous insns
  47                                    on this function unit or 0 if unlimited.  */
  48   struct range ready_cost;      /* Range of ready cost values.  */
  49   struct range issue_delay;     /* Range of issue delay values.  */
  50 };
  51
  52 static void extend_range PARAMS ((struct range *, int, int));
  53 static void init_range PARAMS ((struct range *));
  54 static void write_upcase PARAMS ((const char *));
  55 static void gen_attr PARAMS ((rtx));
  56 static void write_units PARAMS ((int, struct range *, struct range *,
  57                                struct range *, struct range *,
  58                                struct range *));
  59 static void
  60 extend_range (range, min, max)
  61      struct range *range;
  62      int min;
  63      int max;
  64 {
  65   if (range->min > min) range->min = min;
  66   if (range->max < max) range->max = max;
  67 }
  68
  69 static void
  70 init_range (range)
  71      struct range *range;
  72 {
  73   range->min = 100000;
  74   range->max = -1;
  75 }
  76
  77 static void
  78 write_upcase (str)
  79     const char *str;
  80 {
  81   for (; *str; str++)
  82     putchar (TOUPPER(*str));
  83 }
  84
  85 static void
  86 gen_attr (attr)
  87      rtx attr;
  88 {
  89   const char *p;
  90   int is_const = GET_CODE (XEXP (attr, 2)) == CONST;
  91
  92   printf ("#define HAVE_ATTR_%s\n", XSTR (attr, 0));
  93
  94   /* If numeric attribute, don't need to write an enum.  */
  95   if (*XSTR (attr, 1) == '\0')
  96     printf ("extern int get_attr_%s PARAMS ((%s));\n", XSTR (attr, 0),
  97             (is_const ? "void" : "rtx"));
  98   else
  99     {
 100       printf ("enum attr_%s {", XSTR (attr, 0));
 101       write_upcase (XSTR (attr, 0));
 102       printf ("_");
 103
 104       for (p = XSTR (attr, 1); *p != '\0'; p++)
 105         {
 106           if (*p == ',')
 107             {
 108               printf (", ");
 109               write_upcase (XSTR (attr, 0));
 110               printf ("_");
 111             }
 112           else
 113             putchar (TOUPPER(*p));
 114         }
 115
 116       printf ("};\n");
 117       printf ("extern enum attr_%s get_attr_%s PARAMS ((%s));\n\n",
 118               XSTR (attr, 0), XSTR (attr, 0), (is_const ? "void" : "rtx"));
 119     }
 120
 121   /* If `length' attribute, write additional function definitions and define
 122      variables used by `insn_current_length'.  */
 123   if (! strcmp (XSTR (attr, 0), "length"))
 124     {
 125       printf ("extern void shorten_branches PARAMS ((rtx));\n");
 126       printf ("extern int insn_default_length PARAMS ((rtx));\n");
 127       printf ("extern int insn_variable_length_p PARAMS ((rtx));\n");
 128       printf ("extern int insn_current_length PARAMS ((rtx));\n\n");
 129       printf ("extern int *insn_addresses;\n");
 130       printf ("extern int insn_current_address;\n\n");
 131     }
 132 }
 133
 134 static void
 135 write_units (num_units, multiplicity, simultaneity,
 136              ready_cost, issue_delay, blockage)
 137      int num_units;
 138      struct range *multiplicity;
 139      struct range *simultaneity;
 140      struct range *ready_cost;
 141      struct range *issue_delay;
 142      struct range *blockage;
 143 {
 144   int i, q_size;
 145
 146   printf ("#define INSN_SCHEDULING\n\n");
 147   printf ("extern int result_ready_cost PARAMS ((rtx));\n");
 148   printf ("extern int function_units_used PARAMS ((rtx));\n\n");
 149   printf ("extern struct function_unit_desc\n");
 150   printf ("{\n");
 151   printf ("  const char *name;\n");
 152   printf ("  int bitmask;\n");
 153   printf ("  int multiplicity;\n");
 154   printf ("  int simultaneity;\n");
 155   printf ("  int default_cost;\n");
 156   printf ("  int max_issue_delay;\n");
 157   printf ("  int (*ready_cost_function) PARAMS ((rtx));\n");
 158   printf ("  int (*conflict_cost_function) PARAMS ((rtx, rtx));\n");
 159   printf ("  int max_blockage;\n");
 160   printf ("  unsigned int (*blockage_range_function) PARAMS ((rtx));\n");
 161   printf ("  int (*blockage_function) PARAMS ((rtx, rtx));\n");
 162   printf ("} function_units[];\n\n");
 163   printf ("#define FUNCTION_UNITS_SIZE %d\n", num_units);
 164   printf ("#define MIN_MULTIPLICITY %d\n", multiplicity->min);
 165   printf ("#define MAX_MULTIPLICITY %d\n", multiplicity->max);
 166   printf ("#define MIN_SIMULTANEITY %d\n", simultaneity->min);
 167   printf ("#define MAX_SIMULTANEITY %d\n", simultaneity->max);
 168   printf ("#define MIN_READY_COST %d\n", ready_cost->min);
 169   printf ("#define MAX_READY_COST %d\n", ready_cost->max);
 170   printf ("#define MIN_ISSUE_DELAY %d\n", issue_delay->min);
 171   printf ("#define MAX_ISSUE_DELAY %d\n", issue_delay->max);
 172   printf ("#define MIN_BLOCKAGE %d\n", blockage->min);
 173   printf ("#define MAX_BLOCKAGE %d\n", blockage->max);
 174   for (i = 0; (1 << i) < blockage->max; i++)
 175     ;
 176   printf ("#define BLOCKAGE_BITS %d\n", i + 1);
 177
 178   /* INSN_QUEUE_SIZE is a power of two larger than MAX_BLOCKAGE and
 179      MAX_READY_COST.  This is the longest time an isnsn may be queued.  */
 180   i = MAX (blockage->max, ready_cost->max);
 181   for (q_size = 1; q_size <= i; q_size <<= 1)
 182     ;
 183   printf ("#define INSN_QUEUE_SIZE %d\n", q_size);
 184 }
 185
 186 extern int main PARAMS ((int, char **));
 187
 188 int
 189 main (argc, argv)
 190      int argc;
 191      char **argv;
 192 {
 193   rtx desc;
 194   int have_delay = 0;
 195   int have_annul_true = 0;
 196   int have_annul_false = 0;
 197   int num_units = 0;
 198   struct range all_simultaneity, all_multiplicity;
 199   struct range all_ready_cost, all_issue_delay, all_blockage;
 200   struct function_unit *units = 0, *unit;
 201   int i;
 202
 203   init_range (&all_multiplicity);
 204   init_range (&all_simultaneity);
 205   init_range (&all_ready_cost);
 206   init_range (&all_issue_delay);
 207   init_range (&all_blockage);
 208
 209   progname = "genattr";
 210
 211   if (argc <= 1)
 212     fatal ("No input file name.");
 213
 214   if (init_md_reader (argv[1]) != SUCCESS_EXIT_CODE)
 215     return (FATAL_EXIT_CODE);
 216
 217   printf ("/* Generated automatically by the program `genattr'\n\
 218 from the machine description file `md'.  */\n\n");
 219
 220   /* For compatibility, define the attribute `alternative', which is just
 221      a reference to the variable `which_alternative'.  */
 222
 223   printf ("#define HAVE_ATTR_alternative\n");
 224   printf ("#define get_attr_alternative(insn) which_alternative\n");
 225
 226   /* Read the machine description.  */
 227
 228   while (1)
 229     {
 230       int line_no, insn_code_number;
 231
 232       desc = read_md_rtx (&line_no, &insn_code_number);
 233       if (desc == NULL)
 234         break;
 235
 236       if (GET_CODE (desc) == DEFINE_ATTR)
 237         gen_attr (desc);
 238
 239       else if (GET_CODE (desc) == DEFINE_DELAY)
 240         {
 241           if (! have_delay)
 242             {
 243               printf ("#define DELAY_SLOTS\n");
 244               printf ("extern int num_delay_slots PARAMS ((rtx));\n");
 245               printf ("extern int eligible_for_delay PARAMS ((rtx, int, rtx, int));\n\n");
 246               printf ("extern int const_num_delay_slots PARAMS ((rtx));\n\n");
 247               have_delay = 1;
 248             }
 249
 250           for (i = 0; i < XVECLEN (desc, 1); i += 3)
 251             {
 252               if (XVECEXP (desc, 1, i + 1) && ! have_annul_true)
 253                 {
 254                   printf ("#define ANNUL_IFTRUE_SLOTS\n");
 255                   printf ("extern int eligible_for_annul_true PARAMS ((rtx, int, rtx, int));\n");
 256                   have_annul_true = 1;
 257                 }
 258
 259               if (XVECEXP (desc, 1, i + 2) && ! have_annul_false)
 260                 {
 261                   printf ("#define ANNUL_IFFALSE_SLOTS\n");
 262                   printf ("extern int eligible_for_annul_false PARAMS ((rtx, int, rtx, int));\n");
 263                   have_annul_false = 1;
 264                 }
 265             }
 266         }
 267
 268       else if (GET_CODE (desc) == DEFINE_FUNCTION_UNIT)
 269         {
 270           const char *name = XSTR (desc, 0);
 271           int multiplicity = XINT (desc, 1);
 272           int simultaneity = XINT (desc, 2);
 273           int ready_cost = MAX (XINT (desc, 4), 1);
 274           int issue_delay = MAX (XINT (desc, 5), 1);
 275           int issueexp_p = (XVEC (desc, 6) != 0);
 276
 277           for (unit = units; unit; unit = unit->next)
 278             if (strcmp (unit->name, name) == 0)
 279               break;
 280
 281           if (unit == 0)
 282             {
 283               int len = strlen (name) + 1;
 284               unit = (struct function_unit *)
 285                 alloca (sizeof (struct function_unit));
 286               unit->name = (char *) alloca (len);
 287               bcopy (name, unit->name, len);
 288               unit->multiplicity = multiplicity;
 289               unit->simultaneity = simultaneity;
 290               unit->ready_cost.min = unit->ready_cost.max = ready_cost;
 291               unit->issue_delay.min = unit->issue_delay.max = issue_delay;
 292               unit->next = units;
 293               units = unit;
 294               num_units++;
 295
 296               extend_range (&all_multiplicity, multiplicity, multiplicity);
 297               extend_range (&all_simultaneity, simultaneity, simultaneity);
 298             }
 299           else if (unit->multiplicity != multiplicity
 300                    || unit->simultaneity != simultaneity)
 301             fatal ("Differing specifications given for `%s' function unit.",
 302                    unit->name);
 303
 304           extend_range (&unit->ready_cost, ready_cost, ready_cost);
 305           extend_range (&unit->issue_delay,
 306                         issueexp_p ? 1 : issue_delay, issue_delay);
 307           extend_range (&all_ready_cost,
 308                         unit->ready_cost.min, unit->ready_cost.max);
 309           extend_range (&all_issue_delay,
 310                         unit->issue_delay.min, unit->issue_delay.max);
 311         }
 312     }
 313
 314   if (num_units > 0)
 315     {
 316       /* Compute the range of blockage cost values.  See genattrtab.c
 317          for the derivation.  BLOCKAGE (E,C) when SIMULTANEITY is zero is
 318
 319              MAX (ISSUE-DELAY (E,C),
 320                   READY-COST (E) - (READY-COST (C) - 1))
 321
 322          and otherwise
 323
 324              MAX (ISSUE-DELAY (E,C),
 325                   READY-COST (E) - (READY-COST (C) - 1),
 326                   READY-COST (E) - FILL-TIME)  */
 327
 328       for (unit = units; unit; unit = unit->next)
 329         {
 330           struct range blockage;
 331
 332           blockage = unit->issue_delay;
 333           blockage.max = MAX (unit->ready_cost.max
 334                               - (unit->ready_cost.min - 1),
 335                               blockage.max);
 336           blockage.min = MAX (1, blockage.min);
 337
 338           if (unit->simultaneity != 0)
 339             {
 340               int fill_time = ((unit->simultaneity - 1)
 341                                * unit->issue_delay.min);
 342               blockage.min = MAX (unit->ready_cost.min - fill_time,
 343                                   blockage.min);
 344               blockage.max = MAX (unit->ready_cost.max - fill_time,
 345                                   blockage.max);
 346             }
 347           extend_range (&all_blockage, blockage.min, blockage.max);
 348         }
 349
 350       write_units (num_units, &all_multiplicity, &all_simultaneity,
 351                    &all_ready_cost, &all_issue_delay, &all_blockage);
 352     }
 353
 354   /* Output flag masks for use by reorg.
 355
 356      Flags are used to hold branch direction and prediction information
 357      for use by eligible_for_...  */
 358   printf("\n#define ATTR_FLAG_forward\t0x1\n");
 359   printf("#define ATTR_FLAG_backward\t0x2\n");
 360   printf("#define ATTR_FLAG_likely\t0x4\n");
 361   printf("#define ATTR_FLAG_very_likely\t0x8\n");
 362   printf("#define ATTR_FLAG_unlikely\t0x10\n");
 363   printf("#define ATTR_FLAG_very_unlikely\t0x20\n");
 364
 365   fflush (stdout);
 366   return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 367 }
 368
 369 /* Define this so we can link with print-rtl.o to get debug_rtx function.  */
 370 const char *
 371 get_insn_name (code)
 372      int code ATTRIBUTE_UNUSED;
 373 {
 374   return NULL;
 375 }