gcc/recog.h

   1 /* Declarations for interface to insn recognizer and insn-output.c.
   2    Copyright (C) 1987, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 /* Random number that should be large enough for all purposes.  */
  23 #define MAX_RECOG_ALTERNATIVES 30
  24
  25 /* Types of operands.  */
  26 enum op_type {
  27   OP_IN,
  28   OP_OUT,
  29   OP_INOUT
  30 };
  31
  32 struct operand_alternative
  33 {
  34   /* Pointer to the beginning of the constraint string for this alternative,
  35      for easier access by alternative number.  */
  36   const char *constraint;
  37
  38   /* The register class valid for this alternative (possibly NO_REGS).  */
  39   enum reg_class cl;
  40
  41   /* "Badness" of this alternative, computed from number of '?' and '!'
  42      characters in the constraint string.  */
  43   unsigned int reject;
  44
  45   /* -1 if no matching constraint was found, or an operand number.  */
  46   int matches;
  47   /* The same information, but reversed: -1 if this operand is not
  48      matched by any other, or the operand number of the operand that
  49      matches this one.  */
  50   int matched;
  51
  52   /* Nonzero if '&' was found in the constraint string.  */
  53   unsigned int earlyclobber:1;
  54   /* Nonzero if 'm' was found in the constraint string.  */
  55   unsigned int memory_ok:1;
  56   /* Nonzero if 'o' was found in the constraint string.  */
  57   unsigned int offmem_ok:1;
  58   /* Nonzero if 'V' was found in the constraint string.  */
  59   unsigned int nonoffmem_ok:1;
  60   /* Nonzero if '<' was found in the constraint string.  */
  61   unsigned int decmem_ok:1;
  62   /* Nonzero if '>' was found in the constraint string.  */
  63   unsigned int incmem_ok:1;
  64   /* Nonzero if 'p' was found in the constraint string.  */
  65   unsigned int is_address:1;
  66   /* Nonzero if 'X' was found in the constraint string, or if the constraint
  67      string for this alternative was empty.  */
  68   unsigned int anything_ok:1;
  69 };
  70
  71
  72 extern void init_recog (void);
  73 extern void init_recog_no_volatile (void);
  74 extern int check_asm_operands (rtx);
  75 extern int asm_operand_ok (rtx, const char *);
  76 extern int validate_change (rtx, rtx *, rtx, int);
  77 extern int insn_invalid_p (rtx);
  78 extern void confirm_change_group (void);
  79 extern int apply_change_group (void);
  80 extern int num_validated_changes (void);
  81 extern void cancel_changes (int);
  82 extern int constrain_operands (int);
  83 extern int constrain_operands_cached (int);
  84 extern int memory_address_p (enum machine_mode, rtx);
  85 extern int strict_memory_address_p (enum machine_mode, rtx);
  86 extern int validate_replace_rtx_subexp (rtx, rtx, rtx, rtx *);
  87 extern int validate_replace_rtx (rtx, rtx, rtx);
  88 extern void validate_replace_rtx_group (rtx, rtx, rtx);
  89 extern void validate_replace_src_group (rtx, rtx, rtx);
  90 extern int num_changes_pending (void);
  91 #ifdef HAVE_cc0
  92 extern int next_insn_tests_no_inequality (rtx);
  93 #endif
  94 extern int reg_fits_class_p (rtx, enum reg_class, int, enum machine_mode);
  95 extern rtx *find_single_use (rtx, rtx, rtx *);
  96
  97 extern int offsettable_memref_p (rtx);
  98 extern int offsettable_nonstrict_memref_p (rtx);
  99 extern int offsettable_address_p (int, enum machine_mode, rtx);
 100 extern int mode_dependent_address_p (rtx);
 101
 102 extern int recog (rtx, rtx, int *);
 103 #ifndef GENERATOR_FILE
 104 static inline int recog_memoized (rtx insn);
 105 #endif
 106 extern void add_clobbers (rtx, int);
 107 extern int added_clobbers_hard_reg_p (int);
 108 extern void insn_extract (rtx);
 109 extern void extract_insn (rtx);
 110 extern void extract_constrain_insn_cached (rtx);
 111 extern void extract_insn_cached (rtx);
 112 extern void preprocess_constraints (void);
 113 extern rtx peep2_next_insn (int);
 114 extern int peep2_regno_dead_p (int, int);
 115 extern int peep2_reg_dead_p (int, rtx);
 116 #ifdef CLEAR_HARD_REG_SET
 117 extern rtx peep2_find_free_register (int, int, const char *,
 118                                      enum machine_mode, HARD_REG_SET *);
 119 #endif
 120 extern void peephole2_optimize (FILE *);
 121 extern rtx peephole2_insns (rtx, rtx, int *);
 122
 123 extern int store_data_bypass_p (rtx, rtx);
 124 extern int if_test_bypass_p (rtx, rtx);
 125
 126 #ifndef GENERATOR_FILE
 127 /* Try recognizing the instruction INSN,
 128    and return the code number that results.
 129    Remember the code so that repeated calls do not
 130    need to spend the time for actual rerecognition.
 131
 132    This function is the normal interface to instruction recognition.
 133    The automatically-generated function `recog' is normally called
 134    through this one.  (The only exception is in combine.c.)  */
 135
 136 static inline int
 137 recog_memoized (rtx insn)
 138 {
 139   if (INSN_CODE (insn) < 0)
 140     INSN_CODE (insn) = recog (PATTERN (insn), insn, 0);
 141   return INSN_CODE (insn);
 142 }
 143 #endif
 144
 145 /* Nonzero means volatile operands are recognized.  */
 146 extern int volatile_ok;
 147
 148 /* Set by constrain_operands to the number of the alternative that
 149    matched.  */
 150 extern int which_alternative;
 151
 152 /* The following vectors hold the results from insn_extract.  */
 153
 154 struct recog_data
 155 {
 156   /* It is very tempting to make the 5 operand related arrays into a
 157      structure and index on that.  However, to be source compatible
 158      with all of the existing md file insn constraints and output
 159      templates, we need `operand' as a flat array.  Without that
 160      member, making an array for the rest seems pointless.  */
 161
 162   /* Gives value of operand N.  */
 163   rtx operand[MAX_RECOG_OPERANDS];
 164
 165   /* Gives location where operand N was found.  */
 166   rtx *operand_loc[MAX_RECOG_OPERANDS];
 167
 168   /* Gives the constraint string for operand N.  */
 169   const char *constraints[MAX_RECOG_OPERANDS];
 170
 171   /* Gives the mode of operand N.  */
 172   enum machine_mode operand_mode[MAX_RECOG_OPERANDS];
 173
 174   /* Gives the type (in, out, inout) for operand N.  */
 175   enum op_type operand_type[MAX_RECOG_OPERANDS];
 176
 177   /* Gives location where the Nth duplicate-appearance of an operand
 178      was found.  This is something that matched MATCH_DUP.  */
 179   rtx *dup_loc[MAX_DUP_OPERANDS];
 180
 181   /* Gives the operand number that was duplicated in the Nth
 182      duplicate-appearance of an operand.  */
 183   char dup_num[MAX_DUP_OPERANDS];
 184
 185   /* ??? Note that these are `char' instead of `unsigned char' to (try to)
 186      avoid certain lossage from K&R C, wherein `unsigned char' default
 187      promotes to `unsigned int' instead of `int' as in ISO C.  As of 1999,
 188      the most common places to bootstrap from K&R C are SunOS and HPUX,
 189      both of which have signed characters by default.  The only other
 190      supported natives that have both K&R C and unsigned characters are
 191      ROMP and Irix 3, and neither have been seen for a while, but do
 192      continue to consider unsignedness when performing arithmetic inside
 193      a comparison.  */
 194
 195   /* The number of operands of the insn.  */
 196   char n_operands;
 197
 198   /* The number of MATCH_DUPs in the insn.  */
 199   char n_dups;
 200
 201   /* The number of alternatives in the constraints for the insn.  */
 202   char n_alternatives;
 203
 204   /* In case we are caching, hold insn data was generated for.  */
 205   rtx insn;
 206 };
 207
 208 extern struct recog_data recog_data;
 209
 210 /* Contains a vector of operand_alternative structures for every operand.
 211    Set up by preprocess_constraints.  */
 212 extern struct operand_alternative recog_op_alt[MAX_RECOG_OPERANDS][MAX_RECOG_ALTERNATIVES];
 213
 214 /* A table defined in insn-output.c that give information about
 215    each insn-code value.  */
 216
 217 typedef int (*insn_operand_predicate_fn) (rtx, enum machine_mode);
 218 typedef const char * (*insn_output_fn) (rtx *, rtx);
 219 typedef rtx (*insn_gen_fn) (rtx, ...);
 220
 221 struct insn_operand_data
 222 {
 223   const insn_operand_predicate_fn predicate;
 224
 225   const char *const constraint;
 226
 227   ENUM_BITFIELD(machine_mode) const mode : 16;
 228
 229   const char strict_low;
 230
 231   const char eliminable;
 232 };
 233
 234 /* Legal values for insn_data.output_format.  Indicate what type of data
 235    is stored in insn_data.output.  */
 236 #define INSN_OUTPUT_FORMAT_NONE         0       /* abort */
 237 #define INSN_OUTPUT_FORMAT_SINGLE       1       /* const char * */
 238 #define INSN_OUTPUT_FORMAT_MULTI        2       /* const char * const * */
 239 #define INSN_OUTPUT_FORMAT_FUNCTION     3       /* const char * (*)(...) */
 240
 241 struct insn_data
 242 {
 243   const char *const name;
 244 #if HAVE_DESIGNATED_INITIALIZERS
 245   union {
 246     const char *single;
 247     const char *const *multi;
 248     insn_output_fn function;
 249   } output;
 250 #else
 251   struct {
 252     const char *single;
 253     const char *const *multi;
 254     insn_output_fn function;
 255   } output;
 256 #endif
 257   const insn_gen_fn genfun;
 258   const struct insn_operand_data *const operand;
 259
 260   const char n_operands;
 261   const char n_dups;
 262   const char n_alternatives;
 263   const char output_format;
 264 };
 265
 266 extern const struct insn_data insn_data[];