freebsd-src/contrib/gcc/genattr.c
David E. O'Brien 1952e2e1c1 Enlist the FreeBSD-CURRENT users as testers of what is to become Gcc 3.1.0.
These bits are taken from the FSF anoncvs repo on 1-Feb-2002 08:20 PST.
2002-02-01 18:16:02 +00:00

379 lines
11 KiB
C

/* Generate attribute information (insn-attr.h) from machine description.
Copyright (C) 1991, 1994, 1996, 1998, 1999, 2000 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 2, 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 COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include "hconfig.h"
#include "system.h"
#include "rtl.h"
#include "errors.h"
#include "gensupport.h"
/* A range of values. */
struct range
{
int min;
int max;
};
/* Record information about each function unit mentioned in a
DEFINE_FUNCTION_UNIT. */
struct function_unit
{
char *name; /* Function unit name. */
struct function_unit *next; /* Next function unit. */
int multiplicity; /* Number of units of this type. */
int simultaneity; /* Maximum number of simultaneous insns
on this function unit or 0 if unlimited. */
struct range ready_cost; /* Range of ready cost values. */
struct range issue_delay; /* Range of issue delay values. */
};
static void extend_range PARAMS ((struct range *, int, int));
static void init_range PARAMS ((struct range *));
static void write_upcase PARAMS ((const char *));
static void gen_attr PARAMS ((rtx));
static void write_units PARAMS ((int, struct range *, struct range *,
struct range *, struct range *,
struct range *));
static void
extend_range (range, min, max)
struct range *range;
int min;
int max;
{
if (range->min > min) range->min = min;
if (range->max < max) range->max = max;
}
static void
init_range (range)
struct range *range;
{
range->min = 100000;
range->max = -1;
}
static void
write_upcase (str)
const char *str;
{
for (; *str; str++)
putchar (TOUPPER(*str));
}
static void
gen_attr (attr)
rtx attr;
{
const char *p;
int is_const = GET_CODE (XEXP (attr, 2)) == CONST;
printf ("#define HAVE_ATTR_%s\n", XSTR (attr, 0));
/* If numeric attribute, don't need to write an enum. */
if (*XSTR (attr, 1) == '\0')
printf ("extern int get_attr_%s PARAMS ((%s));\n", XSTR (attr, 0),
(is_const ? "void" : "rtx"));
else
{
printf ("enum attr_%s {", XSTR (attr, 0));
write_upcase (XSTR (attr, 0));
printf ("_");
for (p = XSTR (attr, 1); *p != '\0'; p++)
{
if (*p == ',')
{
printf (", ");
write_upcase (XSTR (attr, 0));
printf ("_");
}
else
putchar (TOUPPER(*p));
}
printf ("};\n");
printf ("extern enum attr_%s get_attr_%s PARAMS ((%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"))
{
printf ("extern void shorten_branches PARAMS ((rtx));\n");
printf ("extern int insn_default_length PARAMS ((rtx));\n");
printf ("extern int insn_variable_length_p PARAMS ((rtx));\n");
printf ("extern int insn_current_length PARAMS ((rtx));\n\n");
printf ("#include \"insn-addr.h\"\n\n");
}
}
static void
write_units (num_units, multiplicity, simultaneity,
ready_cost, issue_delay, blockage)
int num_units;
struct range *multiplicity;
struct range *simultaneity;
struct range *ready_cost;
struct range *issue_delay;
struct range *blockage;
{
int i, q_size;
printf ("#define INSN_SCHEDULING\n\n");
printf ("extern int result_ready_cost PARAMS ((rtx));\n");
printf ("extern int function_units_used PARAMS ((rtx));\n\n");
printf ("extern const struct function_unit_desc\n");
printf ("{\n");
printf (" const char *const name;\n");
printf (" const int bitmask;\n");
printf (" const int multiplicity;\n");
printf (" const int simultaneity;\n");
printf (" const int default_cost;\n");
printf (" const int max_issue_delay;\n");
printf (" int (*const ready_cost_function) PARAMS ((rtx));\n");
printf (" int (*const conflict_cost_function) PARAMS ((rtx, rtx));\n");
printf (" const int max_blockage;\n");
printf (" unsigned int (*const blockage_range_function) PARAMS ((rtx));\n");
printf (" int (*const blockage_function) PARAMS ((rtx, rtx));\n");
printf ("} function_units[];\n\n");
printf ("#define FUNCTION_UNITS_SIZE %d\n", num_units);
printf ("#define MIN_MULTIPLICITY %d\n", multiplicity->min);
printf ("#define MAX_MULTIPLICITY %d\n", multiplicity->max);
printf ("#define MIN_SIMULTANEITY %d\n", simultaneity->min);
printf ("#define MAX_SIMULTANEITY %d\n", simultaneity->max);
printf ("#define MIN_READY_COST %d\n", ready_cost->min);
printf ("#define MAX_READY_COST %d\n", ready_cost->max);
printf ("#define MIN_ISSUE_DELAY %d\n", issue_delay->min);
printf ("#define MAX_ISSUE_DELAY %d\n", issue_delay->max);
printf ("#define MIN_BLOCKAGE %d\n", blockage->min);
printf ("#define MAX_BLOCKAGE %d\n", blockage->max);
for (i = 0; (1 << i) < blockage->max; i++)
;
printf ("#define BLOCKAGE_BITS %d\n", i + 1);
/* INSN_QUEUE_SIZE is a power of two larger than MAX_BLOCKAGE and
MAX_READY_COST. This is the longest time an isnsn may be queued. */
i = MAX (blockage->max, ready_cost->max);
for (q_size = 1; q_size <= i; q_size <<= 1)
;
printf ("#define INSN_QUEUE_SIZE %d\n", q_size);
}
extern int main PARAMS ((int, char **));
int
main (argc, argv)
int argc;
char **argv;
{
rtx desc;
int have_delay = 0;
int have_annul_true = 0;
int have_annul_false = 0;
int num_units = 0;
struct range all_simultaneity, all_multiplicity;
struct range all_ready_cost, all_issue_delay, all_blockage;
struct function_unit *units = 0, *unit;
int i;
init_range (&all_multiplicity);
init_range (&all_simultaneity);
init_range (&all_ready_cost);
init_range (&all_issue_delay);
init_range (&all_blockage);
progname = "genattr";
if (argc <= 1)
fatal ("no input file name");
if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
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");
/* 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)
gen_attr (desc);
else if (GET_CODE (desc) == DEFINE_DELAY)
{
if (! have_delay)
{
printf ("#define DELAY_SLOTS\n");
printf ("extern int num_delay_slots PARAMS ((rtx));\n");
printf ("extern int eligible_for_delay PARAMS ((rtx, int, rtx, int));\n\n");
printf ("extern int const_num_delay_slots PARAMS ((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 PARAMS ((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 PARAMS ((rtx, int, rtx, int));\n");
have_annul_false = 1;
}
}
}
else if (GET_CODE (desc) == DEFINE_FUNCTION_UNIT)
{
const char *name = XSTR (desc, 0);
int multiplicity = XINT (desc, 1);
int simultaneity = XINT (desc, 2);
int ready_cost = MAX (XINT (desc, 4), 1);
int issue_delay = MAX (XINT (desc, 5), 1);
int issueexp_p = (XVEC (desc, 6) != 0);
for (unit = units; unit; unit = unit->next)
if (strcmp (unit->name, name) == 0)
break;
if (unit == 0)
{
unit = (struct function_unit *)
xmalloc (sizeof (struct function_unit));
unit->name = xstrdup (name);
unit->multiplicity = multiplicity;
unit->simultaneity = simultaneity;
unit->ready_cost.min = unit->ready_cost.max = ready_cost;
unit->issue_delay.min = unit->issue_delay.max = issue_delay;
unit->next = units;
units = unit;
num_units++;
extend_range (&all_multiplicity, multiplicity, multiplicity);
extend_range (&all_simultaneity, simultaneity, simultaneity);
}
else if (unit->multiplicity != multiplicity
|| unit->simultaneity != simultaneity)
fatal ("Differing specifications given for `%s' function unit",
unit->name);
extend_range (&unit->ready_cost, ready_cost, ready_cost);
extend_range (&unit->issue_delay,
issueexp_p ? 1 : issue_delay, issue_delay);
extend_range (&all_ready_cost,
unit->ready_cost.min, unit->ready_cost.max);
extend_range (&all_issue_delay,
unit->issue_delay.min, unit->issue_delay.max);
}
}
if (num_units > 0)
{
/* Compute the range of blockage cost values. See genattrtab.c
for the derivation. BLOCKAGE (E,C) when SIMULTANEITY is zero is
MAX (ISSUE-DELAY (E,C),
READY-COST (E) - (READY-COST (C) - 1))
and otherwise
MAX (ISSUE-DELAY (E,C),
READY-COST (E) - (READY-COST (C) - 1),
READY-COST (E) - FILL-TIME) */
for (unit = units; unit; unit = unit->next)
{
struct range blockage;
blockage = unit->issue_delay;
blockage.max = MAX (unit->ready_cost.max
- (unit->ready_cost.min - 1),
blockage.max);
blockage.min = MAX (1, blockage.min);
if (unit->simultaneity != 0)
{
int fill_time = ((unit->simultaneity - 1)
* unit->issue_delay.min);
blockage.min = MAX (unit->ready_cost.min - fill_time,
blockage.min);
blockage.max = MAX (unit->ready_cost.max - fill_time,
blockage.max);
}
extend_range (&all_blockage, blockage.min, blockage.max);
}
write_units (num_units, &all_multiplicity, &all_simultaneity,
&all_ready_cost, &all_issue_delay, &all_blockage);
}
/* 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;
}