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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [genattr.c] - Rev 765
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/* Generate attribute information (insn-attr.h) from machine description. Copyright (C) 1991, 1994, 1996, 1998, 1999, 2000, 2003, 2004, 2007, 2008, 2010, 2011 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 void gen_attr (rtx); static VEC (rtx, heap) *const_attrs, *reservations; static void gen_attr (rtx attr) { const char *p; int is_const = GET_CODE (XEXP (attr, 2)) == CONST; if (is_const) VEC_safe_push (rtx, heap, const_attrs, attr); printf ("#define HAVE_ATTR_%s\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")); else { p = XSTR (attr, 1); if (*p == '\0') printf ("extern int get_attr_%s (%s);\n", XSTR (attr, 0), (is_const ? "void" : "rtx")); else printf ("extern enum attr_%s get_attr_%s (%s);\n\n", XSTR (attr, 0), XSTR (attr, 0), (is_const ? "void" : "rtx")); } /* 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);\n\ extern int insn_default_length (rtx);\n\ extern int insn_min_length (rtx);\n\ extern int insn_variable_length_p (rtx);\n\ extern int insn_current_length (rtx);\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 (rtx, const_attrs, i, attr) if (strcmp (XSTR (attr, 0), XSTR (exp, 0)) == 0) { unsigned int j; rtx resv; FOR_EACH_VEC_ELT (rtx, 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, char **argv) { rtx desc; int have_delay = 0; int have_annul_true = 0; int have_annul_false = 0; 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"); /* For compatibility, define the attribute `alternative', which is just a reference to the variable `which_alternative'. */ puts ("#define HAVE_ATTR_alternative"); puts ("#define get_attr_alternative(insn) which_alternative"); /* Read the machine description. */ while (1) { int line_no, insn_code_number; desc = read_md_rtx (&line_no, &insn_code_number); if (desc == NULL) break; if (GET_CODE (desc) == DEFINE_ATTR || GET_CODE (desc) == DEFINE_ENUM_ATTR) gen_attr (desc); else if (GET_CODE (desc) == DEFINE_DELAY) { if (! have_delay) { printf ("extern int num_delay_slots (rtx);\n"); printf ("extern int eligible_for_delay (rtx, int, rtx, int);\n\n"); printf ("extern int const_num_delay_slots (rtx);\n\n"); have_delay = 1; } for (i = 0; i < XVECLEN (desc, 1); i += 3) { if (XVECEXP (desc, 1, i + 1) && ! have_annul_true) { printf ("#define ANNUL_IFTRUE_SLOTS\n"); printf ("extern int eligible_for_annul_true (rtx, int, rtx, int);\n"); have_annul_true = 1; } if (XVECEXP (desc, 1, i + 2) && ! have_annul_false) { printf ("#define ANNUL_IFFALSE_SLOTS\n"); printf ("extern int eligible_for_annul_false (rtx, int, rtx, int);\n"); have_annul_false = 1; } } } else if (GET_CODE (desc) == DEFINE_INSN_RESERVATION) { num_insn_reservations++; VEC_safe_push (rtx, heap, reservations, desc); } } if (num_insn_reservations > 0) { bool has_tune_attr = find_tune_attr (XEXP (VEC_index (rtx, 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);\n\n"); printf ("/* Insn latency time defined in define_insn_reservation. */\n"); printf ("extern int (*insn_default_latency) (rtx);\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);\n\n"); printf ("/* Insn latency time defined in define_insn_reservation. */\n"); printf ("extern int insn_default_latency (rtx);\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);\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, rtx);\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);\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);\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, rtx);\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);\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);\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);\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"); } /* Output flag masks for use by reorg. Flags are used to hold branch direction and prediction information for use by eligible_for_... */ printf("\n#define ATTR_FLAG_forward\t0x1\n"); printf("#define ATTR_FLAG_backward\t0x2\n"); printf("#define ATTR_FLAG_likely\t0x4\n"); printf("#define ATTR_FLAG_very_likely\t0x8\n"); printf("#define ATTR_FLAG_unlikely\t0x10\n"); printf("#define ATTR_FLAG_very_unlikely\t0x20\n"); puts("\n#endif /* GCC_INSN_ATTR_H */"); if (ferror (stdout) || fflush (stdout) || fclose (stdout)) return FATAL_EXIT_CODE; return SUCCESS_EXIT_CODE; }
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