85ec4feb11
From-SVN: r256169
374 lines
14 KiB
C
374 lines
14 KiB
C
/* Generate attribute information (insn-attr.h) from machine description.
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Copyright (C) 1991-2018 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 3, 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 COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "bconfig.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "rtl.h"
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#include "errors.h"
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#include "read-md.h"
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#include "gensupport.h"
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static vec<rtx> const_attrs, reservations;
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static void
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gen_attr (md_rtx_info *info)
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{
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const char *p;
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rtx attr = info->def;
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int is_const = GET_CODE (XEXP (attr, 2)) == CONST;
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if (is_const)
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const_attrs.safe_push (attr);
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printf ("#define HAVE_ATTR_%s 1\n", XSTR (attr, 0));
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/* If numeric attribute, don't need to write an enum. */
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if (GET_CODE (attr) == DEFINE_ENUM_ATTR)
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printf ("extern enum %s get_attr_%s (%s);\n\n",
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XSTR (attr, 1), XSTR (attr, 0),
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(is_const ? "void" : "rtx_insn *"));
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else
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{
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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 (%s);\n", XSTR (attr, 0),
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(is_const ? "void" : "rtx_insn *"));
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else
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printf ("extern enum attr_%s get_attr_%s (%s);\n\n",
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XSTR (attr, 0), XSTR (attr, 0),
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(is_const ? "void" : "rtx_insn *"));
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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 (rtx_insn *);\n\
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extern int insn_default_length (rtx_insn *);\n\
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extern int insn_min_length (rtx_insn *);\n\
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extern int insn_variable_length_p (rtx_insn *);\n\
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extern int insn_current_length (rtx_insn *);\n\n\
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#include \"insn-addr.h\"\n");
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}
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}
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/* Check that attribute NAME is used in define_insn_reservation condition
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EXP. Return true if it is. */
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static bool
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check_tune_attr (const char *name, rtx exp)
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{
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switch (GET_CODE (exp))
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{
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case AND:
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if (check_tune_attr (name, XEXP (exp, 0)))
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return true;
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return check_tune_attr (name, XEXP (exp, 1));
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case IOR:
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return (check_tune_attr (name, XEXP (exp, 0))
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&& check_tune_attr (name, XEXP (exp, 1)));
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case EQ_ATTR:
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return strcmp (XSTR (exp, 0), name) == 0;
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default:
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return false;
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}
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}
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/* Try to find a const attribute (usually cpu or tune) that is used
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in all define_insn_reservation conditions. */
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static bool
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find_tune_attr (rtx exp)
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{
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unsigned int i;
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rtx attr;
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switch (GET_CODE (exp))
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{
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case AND:
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case IOR:
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if (find_tune_attr (XEXP (exp, 0)))
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return true;
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return find_tune_attr (XEXP (exp, 1));
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case EQ_ATTR:
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if (strcmp (XSTR (exp, 0), "alternative") == 0)
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return false;
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FOR_EACH_VEC_ELT (const_attrs, i, attr)
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if (strcmp (XSTR (attr, 0), XSTR (exp, 0)) == 0)
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{
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unsigned int j;
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rtx resv;
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FOR_EACH_VEC_ELT (reservations, j, resv)
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if (! check_tune_attr (XSTR (attr, 0), XEXP (resv, 2)))
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return false;
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return true;
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}
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return false;
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default:
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return false;
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}
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}
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int
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main (int argc, const char **argv)
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{
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bool have_annul_true = false;
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bool have_annul_false = false;
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int num_insn_reservations = 0;
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int i;
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progname = "genattr";
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if (!init_rtx_reader_args (argc, argv))
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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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puts ("#include \"insn-attr-common.h\"\n");
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/* Read the machine description. */
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md_rtx_info info;
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while (read_md_rtx (&info))
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{
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rtx def = info.def;
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switch (GET_CODE (def))
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{
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case DEFINE_ATTR:
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case DEFINE_ENUM_ATTR:
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gen_attr (&info);
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break;
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case DEFINE_DELAY:
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for (i = 0; i < XVECLEN (def, 1); i += 3)
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{
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if (XVECEXP (def, 1, i + 1))
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have_annul_true = true;
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if (XVECEXP (def, 1, i + 2))
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have_annul_false = true;
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}
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break;
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case DEFINE_INSN_RESERVATION:
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num_insn_reservations++;
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reservations.safe_push (def);
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break;
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default:
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break;
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}
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}
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printf ("extern int num_delay_slots (rtx_insn *);\n");
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printf ("extern int eligible_for_delay (rtx_insn *, int, rtx_insn *, int);\n\n");
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printf ("extern int const_num_delay_slots (rtx_insn *);\n\n");
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printf ("#define ANNUL_IFTRUE_SLOTS %d\n", have_annul_true);
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printf ("extern int eligible_for_annul_true (rtx_insn *, int, rtx_insn *, int);\n");
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printf ("#define ANNUL_IFFALSE_SLOTS %d\n", have_annul_false);
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printf ("extern int eligible_for_annul_false (rtx_insn *, int, rtx_insn *, int);\n");
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if (num_insn_reservations > 0)
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{
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bool has_tune_attr
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= find_tune_attr (XEXP (reservations[0], 2));
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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_ALTS\n");
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printf ("#define AUTOMATON_ALTS 0\n");
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printf ("#endif\n\n");
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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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if (has_tune_attr)
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{
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printf ("/* Initialize fn pointers for internal_dfa_insn_code\n");
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printf (" and insn_default_latency. */\n");
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printf ("extern void init_sched_attrs (void);\n\n");
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printf ("/* Internal insn code number used by automata. */\n");
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printf ("extern int (*internal_dfa_insn_code) (rtx_insn *);\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) (rtx_insn *);\n\n");
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}
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else
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{
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printf ("#define init_sched_attrs() do { } while (0)\n\n");
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printf ("/* Internal insn code number used by automata. */\n");
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printf ("extern int internal_dfa_insn_code (rtx_insn *);\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 (rtx_insn *);\n\n");
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}
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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 (rtx_insn *);\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 (rtx_insn *, rtx_insn *);\n\n");
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printf ("/* Maximal insn latency time possible of all bypasses for this 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 maximal_insn_latency (rtx_insn *);\n\n");
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printf ("\n#if AUTOMATON_ALTS\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 (rtx);\n\n");
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printf ("#endif\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 const 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 (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 (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 (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 (state_t, rtx);\n");
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printf ("#endif\n\n");
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printf ("extern int min_issue_delay (state_t, rtx_insn *);\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 (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 ("extern int "
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"min_insn_conflict_delay (state_t, rtx_insn *, rtx_insn *);\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 (FILE *, rtx_insn *);\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 (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 (state_t, int);\n");
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printf ("#endif\n\n");
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printf ("/* The following function returns true if insn\n");
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printf (" has a dfa reservation. */\n");
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printf ("extern bool insn_has_dfa_reservation_p (rtx_insn *);\n\n");
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printf ("/* Clean insn code cache. It should be called if there\n");
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printf (" is a chance that condition value in a\n");
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printf (" define_insn_reservation will be changed after\n");
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printf (" last call of dfa_start. */\n");
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printf ("extern void dfa_clean_insn_cache (void);\n\n");
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printf ("extern void dfa_clear_single_insn_cache (rtx_insn *);\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 (void);\n");
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printf ("extern void dfa_finish (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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}
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/* Special-purpose attributes should be tested with if, not #ifdef. */
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const char * const special_attrs[] = { "length", "enabled",
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"preferred_for_size",
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"preferred_for_speed", 0 };
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for (const char * const *p = special_attrs; *p; p++)
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{
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printf ("#ifndef HAVE_ATTR_%s\n"
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"#define HAVE_ATTR_%s 0\n"
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"#endif\n", *p, *p);
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}
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/* We make an exception here to provide stub definitions for
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insn_*_length* / get_attr_enabled functions. */
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puts ("#if !HAVE_ATTR_length\n"
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"extern int hook_int_rtx_insn_unreachable (rtx_insn *);\n"
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"#define insn_default_length hook_int_rtx_insn_unreachable\n"
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"#define insn_min_length hook_int_rtx_insn_unreachable\n"
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"#define insn_variable_length_p hook_int_rtx_insn_unreachable\n"
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"#define insn_current_length hook_int_rtx_insn_unreachable\n"
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"#include \"insn-addr.h\"\n"
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"#endif\n"
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"extern int hook_int_rtx_1 (rtx);\n"
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"#if !HAVE_ATTR_enabled\n"
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"#define get_attr_enabled hook_int_rtx_1\n"
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"#endif\n"
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"#if !HAVE_ATTR_preferred_for_size\n"
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"#define get_attr_preferred_for_size hook_int_rtx_1\n"
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"#endif\n"
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"#if !HAVE_ATTR_preferred_for_speed\n"
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"#define get_attr_preferred_for_speed hook_int_rtx_1\n"
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"#endif\n");
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/* Output flag masks for use by reorg.
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Flags are used to hold branch direction for use by eligible_for_... */
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printf ("\n#define ATTR_FLAG_forward\t0x1\n");
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printf ("#define ATTR_FLAG_backward\t0x2\n");
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puts ("\n#endif /* GCC_INSN_ATTR_H */");
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if (ferror (stdout) || fflush (stdout) || fclose (stdout))
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return FATAL_EXIT_CODE;
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return SUCCESS_EXIT_CODE;
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}
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