blob: 6a9a3c30d3250d6dad385d13dc1b30813d67c86e [file] [log] [blame]
/* Generate attribute information (insn-attr.h) from machine description.
Copyright (C) 1991-2018 Free Software Foundation, Inc.
Contributed by Richard Kenner (
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
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
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
<>. */
#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. */
printf ("extern enum %s get_attr_%s (%s);\n\n",
XSTR (attr, 1), XSTR (attr, 0),
(is_const ? "void" : "rtx_insn *"));
p = XSTR (attr, 1);
if (*p == '\0')
printf ("extern int get_attr_%s (%s);\n", XSTR (attr, 0),
(is_const ? "void" : "rtx_insn *"));
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;
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;
return false;
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))
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))
gen_attr (&info);
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;
reservations.safe_push (def);
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");
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");
/* 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_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"
"extern int hook_int_rtx_1 (rtx);\n"
"#if !HAVE_ATTR_enabled\n"
"#define get_attr_enabled hook_int_rtx_1\n"
"#if !HAVE_ATTR_preferred_for_size\n"
"#define get_attr_preferred_for_size hook_int_rtx_1\n"
"#if !HAVE_ATTR_preferred_for_speed\n"
"#define get_attr_preferred_for_speed hook_int_rtx_1\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))