| /* Generate attribute information (insn-attr.h) from machine description. |
| Copyright (C) 1991-2020 Free Software Foundation, Inc. |
| Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu) |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it under |
| the terms of the GNU General Public License as published by the Free |
| Software Foundation; either version 3, or (at your option) any later |
| version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| |
| #include "bconfig.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "tm.h" |
| #include "rtl.h" |
| #include "errors.h" |
| #include "read-md.h" |
| #include "gensupport.h" |
| |
| |
| static vec<rtx> const_attrs, reservations; |
| |
| |
| static void |
| gen_attr (md_rtx_info *info) |
| { |
| const char *p; |
| rtx attr = info->def; |
| int is_const = GET_CODE (XEXP (attr, 2)) == CONST; |
| |
| if (is_const) |
| const_attrs.safe_push (attr); |
| |
| printf ("#define HAVE_ATTR_%s 1\n", XSTR (attr, 0)); |
| |
| /* If numeric attribute, don't need to write an enum. */ |
| if (GET_CODE (attr) == DEFINE_ENUM_ATTR) |
| printf ("extern enum %s get_attr_%s (%s);\n\n", |
| XSTR (attr, 1), XSTR (attr, 0), |
| (is_const ? "void" : "rtx_insn *")); |
| else |
| { |
| p = XSTR (attr, 1); |
| if (*p == '\0') |
| printf ("extern int get_attr_%s (%s);\n", XSTR (attr, 0), |
| (is_const ? "void" : "rtx_insn *")); |
| else |
| printf ("extern enum attr_%s get_attr_%s (%s);\n\n", |
| XSTR (attr, 0), XSTR (attr, 0), |
| (is_const ? "void" : "rtx_insn *")); |
| } |
| |
| /* If `length' attribute, write additional function definitions and define |
| variables used by `insn_current_length'. */ |
| if (! strcmp (XSTR (attr, 0), "length")) |
| { |
| puts ("\ |
| extern void shorten_branches (rtx_insn *);\n\ |
| extern int insn_default_length (rtx_insn *);\n\ |
| extern int insn_min_length (rtx_insn *);\n\ |
| extern int insn_variable_length_p (rtx_insn *);\n\ |
| extern int insn_current_length (rtx_insn *);\n\n\ |
| #include \"insn-addr.h\"\n"); |
| } |
| } |
| |
| /* Check that attribute NAME is used in define_insn_reservation condition |
| EXP. Return true if it is. */ |
| static bool |
| check_tune_attr (const char *name, rtx exp) |
| { |
| switch (GET_CODE (exp)) |
| { |
| case AND: |
| if (check_tune_attr (name, XEXP (exp, 0))) |
| return true; |
| return check_tune_attr (name, XEXP (exp, 1)); |
| |
| case IOR: |
| return (check_tune_attr (name, XEXP (exp, 0)) |
| && check_tune_attr (name, XEXP (exp, 1))); |
| |
| case EQ_ATTR: |
| return strcmp (XSTR (exp, 0), name) == 0; |
| |
| default: |
| return false; |
| } |
| } |
| |
| /* Try to find a const attribute (usually cpu or tune) that is used |
| in all define_insn_reservation conditions. */ |
| static bool |
| find_tune_attr (rtx exp) |
| { |
| unsigned int i; |
| rtx attr; |
| |
| switch (GET_CODE (exp)) |
| { |
| case AND: |
| case IOR: |
| if (find_tune_attr (XEXP (exp, 0))) |
| return true; |
| return find_tune_attr (XEXP (exp, 1)); |
| |
| case EQ_ATTR: |
| if (strcmp (XSTR (exp, 0), "alternative") == 0) |
| return false; |
| |
| FOR_EACH_VEC_ELT (const_attrs, i, attr) |
| if (strcmp (XSTR (attr, 0), XSTR (exp, 0)) == 0) |
| { |
| unsigned int j; |
| rtx resv; |
| |
| FOR_EACH_VEC_ELT (reservations, j, resv) |
| if (! check_tune_attr (XSTR (attr, 0), XEXP (resv, 2))) |
| return false; |
| return true; |
| } |
| return false; |
| |
| default: |
| return false; |
| } |
| } |
| |
| int |
| main (int argc, const char **argv) |
| { |
| bool have_annul_true = false; |
| bool have_annul_false = false; |
| int num_insn_reservations = 0; |
| int i; |
| |
| progname = "genattr"; |
| |
| if (!init_rtx_reader_args (argc, argv)) |
| return (FATAL_EXIT_CODE); |
| |
| puts ("/* Generated automatically by the program `genattr'"); |
| puts (" from the machine description file `md'. */\n"); |
| puts ("#ifndef GCC_INSN_ATTR_H"); |
| puts ("#define GCC_INSN_ATTR_H\n"); |
| |
| puts ("#include \"insn-attr-common.h\"\n"); |
| |
| /* Read the machine description. */ |
| |
| md_rtx_info info; |
| while (read_md_rtx (&info)) |
| { |
| rtx def = info.def; |
| switch (GET_CODE (def)) |
| { |
| case DEFINE_ATTR: |
| case DEFINE_ENUM_ATTR: |
| gen_attr (&info); |
| break; |
| |
| case DEFINE_DELAY: |
| for (i = 0; i < XVECLEN (def, 1); i += 3) |
| { |
| if (XVECEXP (def, 1, i + 1)) |
| have_annul_true = true; |
| |
| if (XVECEXP (def, 1, i + 2)) |
| have_annul_false = true; |
| } |
| break; |
| |
| case DEFINE_INSN_RESERVATION: |
| num_insn_reservations++; |
| reservations.safe_push (def); |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| printf ("extern int num_delay_slots (rtx_insn *);\n"); |
| printf ("extern int eligible_for_delay (rtx_insn *, int, rtx_insn *, int);\n\n"); |
| printf ("extern int const_num_delay_slots (rtx_insn *);\n\n"); |
| printf ("#define ANNUL_IFTRUE_SLOTS %d\n", have_annul_true); |
| printf ("extern int eligible_for_annul_true (rtx_insn *, int, rtx_insn *, int);\n"); |
| printf ("#define ANNUL_IFFALSE_SLOTS %d\n", have_annul_false); |
| printf ("extern int eligible_for_annul_false (rtx_insn *, int, rtx_insn *, int);\n"); |
| |
| if (num_insn_reservations > 0) |
| { |
| bool has_tune_attr |
| = find_tune_attr (XEXP (reservations[0], 2)); |
| /* Output interface for pipeline hazards recognition based on |
| DFA (deterministic finite state automata. */ |
| printf ("\n/* DFA based pipeline interface. */"); |
| printf ("\n#ifndef AUTOMATON_ALTS\n"); |
| printf ("#define AUTOMATON_ALTS 0\n"); |
| printf ("#endif\n\n"); |
| printf ("\n#ifndef AUTOMATON_STATE_ALTS\n"); |
| printf ("#define AUTOMATON_STATE_ALTS 0\n"); |
| printf ("#endif\n\n"); |
| printf ("#ifndef CPU_UNITS_QUERY\n"); |
| printf ("#define CPU_UNITS_QUERY 0\n"); |
| printf ("#endif\n\n"); |
| /* Interface itself: */ |
| if (has_tune_attr) |
| { |
| printf ("/* Initialize fn pointers for internal_dfa_insn_code\n"); |
| printf (" and insn_default_latency. */\n"); |
| printf ("extern void init_sched_attrs (void);\n\n"); |
| printf ("/* Internal insn code number used by automata. */\n"); |
| printf ("extern int (*internal_dfa_insn_code) (rtx_insn *);\n\n"); |
| printf ("/* Insn latency time defined in define_insn_reservation. */\n"); |
| printf ("extern int (*insn_default_latency) (rtx_insn *);\n\n"); |
| } |
| else |
| { |
| printf ("#define init_sched_attrs() do { } while (0)\n\n"); |
| printf ("/* Internal insn code number used by automata. */\n"); |
| printf ("extern int internal_dfa_insn_code (rtx_insn *);\n\n"); |
| printf ("/* Insn latency time defined in define_insn_reservation. */\n"); |
| printf ("extern int insn_default_latency (rtx_insn *);\n\n"); |
| } |
| printf ("/* Return nonzero if there is a bypass for given insn\n"); |
| printf (" which is a data producer. */\n"); |
| printf ("extern int bypass_p (rtx_insn *);\n\n"); |
| printf ("/* Insn latency time on data consumed by the 2nd insn.\n"); |
| printf (" Use the function if bypass_p returns nonzero for\n"); |
| printf (" the 1st insn. */\n"); |
| printf ("extern int insn_latency (rtx_insn *, rtx_insn *);\n\n"); |
| printf ("/* Maximal insn latency time possible of all bypasses for this insn.\n"); |
| printf (" Use the function if bypass_p returns nonzero for\n"); |
| printf (" the 1st insn. */\n"); |
| printf ("extern int maximal_insn_latency (rtx_insn *);\n\n"); |
| printf ("\n#if AUTOMATON_ALTS\n"); |
| printf ("/* The following function returns number of alternative\n"); |
| printf (" reservations of given insn. It may be used for better\n"); |
| printf (" insns scheduling heuristics. */\n"); |
| printf ("extern int insn_alts (rtx);\n\n"); |
| printf ("#endif\n\n"); |
| printf ("/* Maximal possible number of insns waiting results being\n"); |
| printf (" produced by insns whose execution is not finished. */\n"); |
| printf ("extern const int max_insn_queue_index;\n\n"); |
| printf ("/* Pointer to data describing current state of DFA. */\n"); |
| printf ("typedef void *state_t;\n\n"); |
| printf ("/* Size of the data in bytes. */\n"); |
| printf ("extern int state_size (void);\n\n"); |
| printf ("/* Initiate given DFA state, i.e. Set up the state\n"); |
| printf (" as all functional units were not reserved. */\n"); |
| printf ("extern void state_reset (state_t);\n"); |
| printf ("/* The following function returns negative value if given\n"); |
| printf (" insn can be issued in processor state described by given\n"); |
| printf (" DFA state. In this case, the DFA state is changed to\n"); |
| printf (" reflect the current and future reservations by given\n"); |
| printf (" insn. Otherwise the function returns minimal time\n"); |
| printf (" delay to issue the insn. This delay may be zero\n"); |
| printf (" for superscalar or VLIW processors. If the second\n"); |
| printf (" parameter is NULL the function changes given DFA state\n"); |
| printf (" as new processor cycle started. */\n"); |
| printf ("extern int state_transition (state_t, rtx);\n"); |
| printf ("\n#if AUTOMATON_STATE_ALTS\n"); |
| printf ("/* The following function returns number of possible\n"); |
| printf (" alternative reservations of given insn in given\n"); |
| printf (" DFA state. It may be used for better insns scheduling\n"); |
| printf (" heuristics. By default the function is defined if\n"); |
| printf (" macro AUTOMATON_STATE_ALTS is defined because its\n"); |
| printf (" implementation may require much memory. */\n"); |
| printf ("extern int state_alts (state_t, rtx);\n"); |
| printf ("#endif\n\n"); |
| printf ("extern int min_issue_delay (state_t, rtx_insn *);\n"); |
| printf ("/* The following function returns nonzero if no one insn\n"); |
| printf (" can be issued in current DFA state. */\n"); |
| printf ("extern int state_dead_lock_p (state_t);\n"); |
| printf ("/* The function returns minimal delay of issue of the 2nd\n"); |
| printf (" insn after issuing the 1st insn in given DFA state.\n"); |
| printf (" The 1st insn should be issued in given state (i.e.\n"); |
| printf (" state_transition should return negative value for\n"); |
| printf (" the insn and the state). Data dependencies between\n"); |
| printf (" the insns are ignored by the function. */\n"); |
| printf ("extern int " |
| "min_insn_conflict_delay (state_t, rtx_insn *, rtx_insn *);\n"); |
| printf ("/* The following function outputs reservations for given\n"); |
| printf (" insn as they are described in the corresponding\n"); |
| printf (" define_insn_reservation. */\n"); |
| printf ("extern void print_reservation (FILE *, rtx_insn *);\n"); |
| printf ("\n#if CPU_UNITS_QUERY\n"); |
| printf ("/* The following function returns code of functional unit\n"); |
| printf (" with given name (see define_cpu_unit). */\n"); |
| printf ("extern int get_cpu_unit_code (const char *);\n"); |
| printf ("/* The following function returns nonzero if functional\n"); |
| printf (" unit with given code is currently reserved in given\n"); |
| printf (" DFA state. */\n"); |
| printf ("extern int cpu_unit_reservation_p (state_t, int);\n"); |
| printf ("#endif\n\n"); |
| printf ("/* The following function returns true if insn\n"); |
| printf (" has a dfa reservation. */\n"); |
| printf ("extern bool insn_has_dfa_reservation_p (rtx_insn *);\n\n"); |
| printf ("/* Clean insn code cache. It should be called if there\n"); |
| printf (" is a chance that condition value in a\n"); |
| printf (" define_insn_reservation will be changed after\n"); |
| printf (" last call of dfa_start. */\n"); |
| printf ("extern void dfa_clean_insn_cache (void);\n\n"); |
| printf ("extern void dfa_clear_single_insn_cache (rtx_insn *);\n\n"); |
| printf ("/* Initiate and finish work with DFA. They should be\n"); |
| printf (" called as the first and the last interface\n"); |
| printf (" functions. */\n"); |
| printf ("extern void dfa_start (void);\n"); |
| printf ("extern void dfa_finish (void);\n"); |
| } |
| else |
| { |
| /* Otherwise we do no scheduling, but we need these typedefs |
| in order to avoid uglifying other code with more ifdefs. */ |
| printf ("typedef void *state_t;\n\n"); |
| } |
| |
| /* Special-purpose attributes should be tested with if, not #ifdef. */ |
| const char * const special_attrs[] = { "length", "enabled", |
| "preferred_for_size", |
| "preferred_for_speed", 0 }; |
| for (const char * const *p = special_attrs; *p; p++) |
| { |
| printf ("#ifndef HAVE_ATTR_%s\n" |
| "#define HAVE_ATTR_%s 0\n" |
| "#endif\n", *p, *p); |
| } |
| /* We make an exception here to provide stub definitions for |
| insn_*_length* / get_attr_enabled functions. */ |
| puts ("#if !HAVE_ATTR_length\n" |
| "extern int hook_int_rtx_insn_unreachable (rtx_insn *);\n" |
| "#define insn_default_length hook_int_rtx_insn_unreachable\n" |
| "#define insn_min_length hook_int_rtx_insn_unreachable\n" |
| "#define insn_variable_length_p hook_int_rtx_insn_unreachable\n" |
| "#define insn_current_length hook_int_rtx_insn_unreachable\n" |
| "#include \"insn-addr.h\"\n" |
| "#endif\n" |
| "extern int hook_int_rtx_1 (rtx);\n" |
| "#if !HAVE_ATTR_enabled\n" |
| "#define get_attr_enabled hook_int_rtx_1\n" |
| "#endif\n" |
| "#if !HAVE_ATTR_preferred_for_size\n" |
| "#define get_attr_preferred_for_size hook_int_rtx_1\n" |
| "#endif\n" |
| "#if !HAVE_ATTR_preferred_for_speed\n" |
| "#define get_attr_preferred_for_speed hook_int_rtx_1\n" |
| "#endif\n"); |
| |
| /* Output flag masks for use by reorg. |
| |
| Flags are used to hold branch direction for use by eligible_for_... */ |
| printf ("\n#define ATTR_FLAG_forward\t0x1\n"); |
| printf ("#define ATTR_FLAG_backward\t0x2\n"); |
| |
| puts ("\n#endif /* GCC_INSN_ATTR_H */"); |
| |
| if (ferror (stdout) || fflush (stdout) || fclose (stdout)) |
| return FATAL_EXIT_CODE; |
| |
| return SUCCESS_EXIT_CODE; |
| } |