482 lines
17 KiB
C
482 lines
17 KiB
C
/* Generate attribute information (insn-attr.h) from machine description.
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Copyright (C) 1991, 1994, 1996, 1998, 1999, 2000 Free Software Foundation, Inc.
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Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "hconfig.h"
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#include "system.h"
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#include "rtl.h"
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#include "errors.h"
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#include "gensupport.h"
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/* A range of values. */
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struct range
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{
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int min;
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int max;
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};
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/* Record information about each function unit mentioned in a
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DEFINE_FUNCTION_UNIT. */
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struct function_unit
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{
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char *name; /* Function unit name. */
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struct function_unit *next; /* Next function unit. */
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int multiplicity; /* Number of units of this type. */
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int simultaneity; /* Maximum number of simultaneous insns
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on this function unit or 0 if unlimited. */
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struct range ready_cost; /* Range of ready cost values. */
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struct range issue_delay; /* Range of issue delay values. */
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};
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static void extend_range PARAMS ((struct range *, int, int));
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static void init_range PARAMS ((struct range *));
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static void write_upcase PARAMS ((const char *));
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static void gen_attr PARAMS ((rtx));
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static void write_units PARAMS ((int, struct range *, struct range *,
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struct range *, struct range *,
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struct range *));
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static void
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extend_range (range, min, max)
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struct range *range;
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int min;
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int max;
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{
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if (range->min > min) range->min = min;
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if (range->max < max) range->max = max;
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}
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static void
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init_range (range)
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struct range *range;
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{
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range->min = 100000;
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range->max = -1;
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}
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static void
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write_upcase (str)
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const char *str;
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{
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for (; *str; str++)
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putchar (TOUPPER(*str));
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}
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static void
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gen_attr (attr)
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rtx attr;
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{
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const char *p, *tag;
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int is_const = GET_CODE (XEXP (attr, 2)) == CONST;
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printf ("#define HAVE_ATTR_%s\n", XSTR (attr, 0));
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/* If numeric attribute, don't need to write an enum. */
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p = XSTR (attr, 1);
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if (*p == '\0')
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printf ("extern int get_attr_%s PARAMS ((%s));\n", XSTR (attr, 0),
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(is_const ? "void" : "rtx"));
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else
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{
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printf ("enum attr_%s {", XSTR (attr, 0));
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while ((tag = scan_comma_elt (&p)) != 0)
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{
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write_upcase (XSTR (attr, 0));
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putchar ('_');
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while (tag != p)
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putchar (TOUPPER (*tag++));
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if (*p == ',')
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fputs (", ", stdout);
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}
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fputs ("};\n", stdout);
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printf ("extern enum attr_%s get_attr_%s PARAMS ((%s));\n\n",
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XSTR (attr, 0), XSTR (attr, 0), (is_const ? "void" : "rtx"));
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}
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/* If `length' attribute, write additional function definitions and define
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variables used by `insn_current_length'. */
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if (! strcmp (XSTR (attr, 0), "length"))
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{
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puts ("\
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extern void shorten_branches PARAMS ((rtx));\n\
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extern int insn_default_length PARAMS ((rtx));\n\
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extern int insn_variable_length_p PARAMS ((rtx));\n\
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extern int insn_current_length PARAMS ((rtx));\n\n\
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#include \"insn-addr.h\"\n");
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}
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}
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static void
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write_units (num_units, multiplicity, simultaneity,
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ready_cost, issue_delay, blockage)
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int num_units;
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struct range *multiplicity;
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struct range *simultaneity;
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struct range *ready_cost;
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struct range *issue_delay;
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struct range *blockage;
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{
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int i, q_size;
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printf ("#define INSN_SCHEDULING\n\n");
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printf ("extern int result_ready_cost PARAMS ((rtx));\n");
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printf ("extern int function_units_used PARAMS ((rtx));\n\n");
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printf ("extern const struct function_unit_desc\n");
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printf ("{\n");
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printf (" const char *const name;\n");
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printf (" const int bitmask;\n");
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printf (" const int multiplicity;\n");
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printf (" const int simultaneity;\n");
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printf (" const int default_cost;\n");
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printf (" const int max_issue_delay;\n");
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printf (" int (*const ready_cost_function) PARAMS ((rtx));\n");
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printf (" int (*const conflict_cost_function) PARAMS ((rtx, rtx));\n");
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printf (" const int max_blockage;\n");
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printf (" unsigned int (*const blockage_range_function) PARAMS ((rtx));\n");
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printf (" int (*const blockage_function) PARAMS ((rtx, rtx));\n");
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printf ("} function_units[];\n\n");
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printf ("#define FUNCTION_UNITS_SIZE %d\n", num_units);
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printf ("#define MIN_MULTIPLICITY %d\n", multiplicity->min);
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printf ("#define MAX_MULTIPLICITY %d\n", multiplicity->max);
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printf ("#define MIN_SIMULTANEITY %d\n", simultaneity->min);
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printf ("#define MAX_SIMULTANEITY %d\n", simultaneity->max);
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printf ("#define MIN_READY_COST %d\n", ready_cost->min);
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printf ("#define MAX_READY_COST %d\n", ready_cost->max);
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printf ("#define MIN_ISSUE_DELAY %d\n", issue_delay->min);
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printf ("#define MAX_ISSUE_DELAY %d\n", issue_delay->max);
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printf ("#define MIN_BLOCKAGE %d\n", blockage->min);
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printf ("#define MAX_BLOCKAGE %d\n", blockage->max);
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for (i = 0; (1 << i) < blockage->max; i++)
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;
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printf ("#define BLOCKAGE_BITS %d\n", i + 1);
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/* INSN_QUEUE_SIZE is a power of two larger than MAX_BLOCKAGE and
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MAX_READY_COST. This is the longest time an isnsn may be queued. */
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i = MAX (blockage->max, ready_cost->max);
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for (q_size = 1; q_size <= i; q_size <<= 1)
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;
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printf ("#define INSN_QUEUE_SIZE %d\n", q_size);
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}
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extern int main PARAMS ((int, char **));
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int
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main (argc, argv)
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int argc;
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char **argv;
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{
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rtx desc;
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int have_delay = 0;
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int have_annul_true = 0;
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int have_annul_false = 0;
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int num_insn_reservations = 0;
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int num_units = 0;
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struct range all_simultaneity, all_multiplicity;
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struct range all_ready_cost, all_issue_delay, all_blockage;
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struct function_unit *units = 0, *unit;
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int i;
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init_range (&all_multiplicity);
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init_range (&all_simultaneity);
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init_range (&all_ready_cost);
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init_range (&all_issue_delay);
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init_range (&all_blockage);
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progname = "genattr";
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if (argc <= 1)
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fatal ("no input file name");
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if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
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return (FATAL_EXIT_CODE);
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puts ("/* Generated automatically by the program `genattr'");
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puts (" from the machine description file `md'. */\n");
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puts ("#ifndef GCC_INSN_ATTR_H");
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puts ("#define GCC_INSN_ATTR_H\n");
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/* For compatibility, define the attribute `alternative', which is just
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a reference to the variable `which_alternative'. */
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puts ("#define HAVE_ATTR_alternative");
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puts ("#define get_attr_alternative(insn) which_alternative");
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/* Read the machine description. */
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while (1)
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{
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int line_no, insn_code_number;
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desc = read_md_rtx (&line_no, &insn_code_number);
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if (desc == NULL)
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break;
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if (GET_CODE (desc) == DEFINE_ATTR)
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gen_attr (desc);
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else if (GET_CODE (desc) == DEFINE_DELAY)
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{
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if (! have_delay)
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{
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printf ("#define DELAY_SLOTS\n");
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printf ("extern int num_delay_slots PARAMS ((rtx));\n");
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printf ("extern int eligible_for_delay PARAMS ((rtx, int, rtx, int));\n\n");
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printf ("extern int const_num_delay_slots PARAMS ((rtx));\n\n");
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have_delay = 1;
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}
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for (i = 0; i < XVECLEN (desc, 1); i += 3)
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{
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if (XVECEXP (desc, 1, i + 1) && ! have_annul_true)
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{
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printf ("#define ANNUL_IFTRUE_SLOTS\n");
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printf ("extern int eligible_for_annul_true PARAMS ((rtx, int, rtx, int));\n");
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have_annul_true = 1;
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}
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if (XVECEXP (desc, 1, i + 2) && ! have_annul_false)
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{
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printf ("#define ANNUL_IFFALSE_SLOTS\n");
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printf ("extern int eligible_for_annul_false PARAMS ((rtx, int, rtx, int));\n");
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have_annul_false = 1;
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}
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}
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}
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else if (GET_CODE (desc) == DEFINE_FUNCTION_UNIT)
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{
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const char *name = XSTR (desc, 0);
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int multiplicity = XINT (desc, 1);
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int simultaneity = XINT (desc, 2);
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int ready_cost = MAX (XINT (desc, 4), 1);
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int issue_delay = MAX (XINT (desc, 5), 1);
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int issueexp_p = (XVEC (desc, 6) != 0);
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for (unit = units; unit; unit = unit->next)
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if (strcmp (unit->name, name) == 0)
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break;
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if (unit == 0)
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{
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unit = (struct function_unit *)
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xmalloc (sizeof (struct function_unit));
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unit->name = xstrdup (name);
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unit->multiplicity = multiplicity;
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unit->simultaneity = simultaneity;
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unit->ready_cost.min = unit->ready_cost.max = ready_cost;
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unit->issue_delay.min = unit->issue_delay.max = issue_delay;
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unit->next = units;
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units = unit;
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num_units++;
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extend_range (&all_multiplicity, multiplicity, multiplicity);
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extend_range (&all_simultaneity, simultaneity, simultaneity);
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}
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else if (unit->multiplicity != multiplicity
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|| unit->simultaneity != simultaneity)
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fatal ("Differing specifications given for `%s' function unit",
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unit->name);
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extend_range (&unit->ready_cost, ready_cost, ready_cost);
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extend_range (&unit->issue_delay,
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issueexp_p ? 1 : issue_delay, issue_delay);
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extend_range (&all_ready_cost,
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unit->ready_cost.min, unit->ready_cost.max);
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extend_range (&all_issue_delay,
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unit->issue_delay.min, unit->issue_delay.max);
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}
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else if (GET_CODE (desc) == DEFINE_INSN_RESERVATION)
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num_insn_reservations++;
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}
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if (num_units > 0 || num_insn_reservations > 0)
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{
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if (num_units > 0)
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printf ("#define TRADITIONAL_PIPELINE_INTERFACE 1\n");
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if (num_insn_reservations > 0)
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printf ("#define DFA_PIPELINE_INTERFACE 1\n");
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/* Compute the range of blockage cost values. See genattrtab.c
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for the derivation. BLOCKAGE (E,C) when SIMULTANEITY is zero is
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MAX (ISSUE-DELAY (E,C),
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READY-COST (E) - (READY-COST (C) - 1))
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and otherwise
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MAX (ISSUE-DELAY (E,C),
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READY-COST (E) - (READY-COST (C) - 1),
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READY-COST (E) - FILL-TIME) */
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for (unit = units; unit; unit = unit->next)
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{
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struct range blockage;
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blockage = unit->issue_delay;
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blockage.max = MAX (unit->ready_cost.max
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- (unit->ready_cost.min - 1),
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blockage.max);
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blockage.min = MAX (1, blockage.min);
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if (unit->simultaneity != 0)
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{
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int fill_time = ((unit->simultaneity - 1)
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* unit->issue_delay.min);
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blockage.min = MAX (unit->ready_cost.min - fill_time,
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blockage.min);
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blockage.max = MAX (unit->ready_cost.max - fill_time,
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blockage.max);
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}
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extend_range (&all_blockage, blockage.min, blockage.max);
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}
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write_units (num_units, &all_multiplicity, &all_simultaneity,
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&all_ready_cost, &all_issue_delay, &all_blockage);
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/* Output interface for pipeline hazards recognition based on
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DFA (deterministic finite state automata. */
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printf ("\n/* DFA based pipeline interface. */");
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printf ("\n#ifndef AUTOMATON_STATE_ALTS\n");
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printf ("#define AUTOMATON_STATE_ALTS 0\n");
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printf ("#endif\n\n");
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printf ("#ifndef CPU_UNITS_QUERY\n");
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printf ("#define CPU_UNITS_QUERY 0\n");
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printf ("#endif\n\n");
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/* Interface itself: */
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printf ("extern int max_dfa_issue_rate;\n\n");
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printf ("/* The following macro value is calculated from the\n");
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printf (" automaton based pipeline description and is equal to\n");
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printf (" maximal number of all insns described in constructions\n");
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printf (" `define_insn_reservation' which can be issued on the\n");
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printf (" same processor cycle. */\n");
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printf ("#define MAX_DFA_ISSUE_RATE max_dfa_issue_rate\n\n");
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printf ("/* Insn latency time defined in define_insn_reservation. */\n");
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printf ("extern int insn_default_latency PARAMS ((rtx));\n\n");
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printf ("/* Return nonzero if there is a bypass for given insn\n");
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printf (" which is a data producer. */\n");
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printf ("extern int bypass_p PARAMS ((rtx));\n\n");
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printf ("/* Insn latency time on data consumed by the 2nd insn.\n");
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printf (" Use the function if bypass_p returns nonzero for\n");
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printf (" the 1st insn. */\n");
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printf ("extern int insn_latency PARAMS ((rtx, rtx));\n\n");
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printf ("/* The following function returns number of alternative\n");
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printf (" reservations of given insn. It may be used for better\n");
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printf (" insns scheduling heuristics. */\n");
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printf ("extern int insn_alts PARAMS ((rtx));\n\n");
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printf ("/* Maximal possible number of insns waiting results being\n");
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printf (" produced by insns whose execution is not finished. */\n");
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printf ("extern int max_insn_queue_index;\n\n");
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printf ("/* Pointer to data describing current state of DFA. */\n");
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printf ("typedef void *state_t;\n\n");
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printf ("/* Size of the data in bytes. */\n");
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printf ("extern int state_size PARAMS ((void));\n\n");
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printf ("/* Initiate given DFA state, i.e. Set up the state\n");
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printf (" as all functional units were not reserved. */\n");
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printf ("extern void state_reset PARAMS ((state_t));\n");
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printf ("/* The following function returns negative value if given\n");
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printf (" insn can be issued in processor state described by given\n");
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printf (" DFA state. In this case, the DFA state is changed to\n");
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printf (" reflect the current and future reservations by given\n");
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printf (" insn. Otherwise the function returns minimal time\n");
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printf (" delay to issue the insn. This delay may be zero\n");
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printf (" for superscalar or VLIW processors. If the second\n");
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printf (" parameter is NULL the function changes given DFA state\n");
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printf (" as new processor cycle started. */\n");
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printf ("extern int state_transition PARAMS ((state_t, rtx));\n");
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printf ("\n#if AUTOMATON_STATE_ALTS\n");
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printf ("/* The following function returns number of possible\n");
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printf (" alternative reservations of given insn in given\n");
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printf (" DFA state. It may be used for better insns scheduling\n");
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printf (" heuristics. By default the function is defined if\n");
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printf (" macro AUTOMATON_STATE_ALTS is defined because its\n");
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printf (" implementation may require much memory. */\n");
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printf ("extern int state_alts PARAMS ((state_t, rtx));\n");
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printf ("#endif\n\n");
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printf ("extern int min_issue_delay PARAMS ((state_t, rtx));\n");
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printf ("/* The following function returns nonzero if no one insn\n");
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printf (" can be issued in current DFA state. */\n");
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printf ("extern int state_dead_lock_p PARAMS ((state_t));\n");
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printf ("/* The function returns minimal delay of issue of the 2nd\n");
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printf (" insn after issuing the 1st insn in given DFA state.\n");
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printf (" The 1st insn should be issued in given state (i.e.\n");
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printf (" state_transition should return negative value for\n");
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printf (" the insn and the state). Data dependencies between\n");
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printf (" the insns are ignored by the function. */\n");
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printf
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("extern int min_insn_conflict_delay PARAMS ((state_t, rtx, rtx));\n");
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printf ("/* The following function outputs reservations for given\n");
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printf (" insn as they are described in the corresponding\n");
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printf (" define_insn_reservation. */\n");
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printf ("extern void print_reservation PARAMS ((FILE *, rtx));\n");
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printf ("\n#if CPU_UNITS_QUERY\n");
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printf ("/* The following function returns code of functional unit\n");
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printf (" with given name (see define_cpu_unit). */\n");
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printf ("extern int get_cpu_unit_code PARAMS ((const char *));\n");
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printf ("/* The following function returns nonzero if functional\n");
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printf (" unit with given code is currently reserved in given\n");
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printf (" DFA state. */\n");
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printf ("extern int cpu_unit_reservation_p PARAMS ((state_t, int));\n");
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printf ("#endif\n\n");
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printf ("/* Initiate and finish work with DFA. They should be\n");
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printf (" called as the first and the last interface\n");
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printf (" functions. */\n");
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printf ("extern void dfa_start PARAMS ((void));\n");
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printf ("extern void dfa_finish PARAMS ((void));\n");
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}
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else
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{
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/* Otherwise we do no scheduling, but we need these typedefs
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in order to avoid uglifying other code with more ifdefs. */
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printf ("typedef void *state_t;\n\n");
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|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* Define this so we can link with print-rtl.o to get debug_rtx function. */
|
|
const char *
|
|
get_insn_name (code)
|
|
int code ATTRIBUTE_UNUSED;
|
|
{
|
|
return NULL;
|
|
}
|