1498 lines
38 KiB
C
1498 lines
38 KiB
C
/* This file is part of the program psim.
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Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License 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 this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "misc.h"
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#include "lf.h"
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#include "table.h"
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#include "filter.h"
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#include "igen.h"
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#include "ld-insn.h"
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#include "ld-decode.h"
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#include "gen.h"
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static insn_uint
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sub_val (insn_uint val,
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insn_field_entry *field,
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int first_pos,
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int last_pos)
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{
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return ((val >> (field->last - last_pos))
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& (((insn_uint)1 << (last_pos - first_pos + 1)) - 1));
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}
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static void
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update_depth (lf *file,
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gen_entry *entry,
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int depth,
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void *data)
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{
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int *max_depth = (int*)data;
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if (*max_depth < depth)
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*max_depth = depth;
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}
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int
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gen_entry_depth (gen_entry *table)
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{
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int depth = 0;
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gen_entry_traverse_tree (NULL,
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table,
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1,
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NULL, /*start*/
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update_depth,
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NULL, /*end*/
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&depth); /* data */
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return depth;
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}
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static void
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print_gen_entry_path (line_ref *line,
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gen_entry *table,
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error_func *print)
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{
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if (table->parent == NULL)
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{
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if (table->top->processor != NULL)
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print (line, "%s", table->top->processor);
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else
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print (line, "");
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}
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else
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{
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print_gen_entry_path (line, table->parent, print);
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print (NULL, ".%d", table->opcode_nr);
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}
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}
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static void
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print_gen_entry_insns (gen_entry *table,
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error_func *print,
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char *first_message,
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char *next_message)
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{
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insn_list *i;
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char *message;
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message = first_message;
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for (i = table->insns; i != NULL; i = i->next)
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{
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insn_entry *insn = i->insn;
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print_gen_entry_path (insn->line, table, print);
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print (NULL, ": %s.%s %s\n",
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insn->format_name,
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insn->name,
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message);
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if (next_message != NULL)
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message = next_message;
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}
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}
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/* same as strcmp */
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static int
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insn_word_cmp (insn_word_entry *l, insn_word_entry *r)
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{
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while (1)
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{
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int bit_nr;
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if (l == NULL && r == NULL)
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return 0; /* all previous fields the same */
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if (l == NULL)
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return -1; /* left shorter than right */
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if (r == NULL)
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return +1; /* left longer than right */
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for (bit_nr = 0;
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bit_nr < options.insn_bit_size;
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bit_nr++)
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{
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if (l->bit[bit_nr]->mask < r->bit[bit_nr]->mask)
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return -1;
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if (l->bit[bit_nr]->mask > r->bit[bit_nr]->mask)
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return 1;
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if (l->bit[bit_nr]->value < r->bit[bit_nr]->value)
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return -1;
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if (l->bit[bit_nr]->value > r->bit[bit_nr]->value)
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return 1;
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}
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l = l->next;
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r = r->next;
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}
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}
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static int
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opcode_bit_cmp (opcode_bits *l,
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opcode_bits *r)
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{
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if (l == NULL && r == NULL)
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return 0; /* all previous bits the same */
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if (l == NULL)
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return -1; /* left shorter than right */
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if (r == NULL)
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return +1; /* left longer than right */
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/* most significant word */
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if (l->field->word_nr < r->field->word_nr)
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return +1; /* left has more significant word */
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if (l->field->word_nr > r->field->word_nr)
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return -1; /* right has more significant word */
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/* most significant bit? */
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if (l->first < r->first)
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return +1; /* left as more significant bit */
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if (l->first > r->first)
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return -1; /* right as more significant bit */
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/* nr bits? */
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if (l->last < r->last)
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return +1; /* left as less bits */
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if (l->last > r->last)
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return -1; /* right as less bits */
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/* value? */
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if (l->value < r->value)
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return -1;
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if (l->value > r->value)
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return 1;
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return 0;
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}
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static int
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opcode_bits_cmp (opcode_bits *l,
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opcode_bits *r)
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{
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while (1)
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{
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int cmp;
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if (l == NULL && r == NULL)
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return 0; /* all previous bits the same */
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cmp = opcode_bit_cmp (l, r);
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if (cmp != 0)
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return cmp;
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l = l->next;
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r = r->next;
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}
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}
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static opcode_bits *
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new_opcode_bits (opcode_bits *old_bits,
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int value,
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int first,
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int last,
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insn_field_entry *field,
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opcode_field *opcode)
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{
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opcode_bits *new_bits = ZALLOC (opcode_bits);
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new_bits->field = field;
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new_bits->value = value;
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new_bits->first = first;
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new_bits->last = last;
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new_bits->opcode = opcode;
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if (old_bits != NULL)
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{
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opcode_bits *new_list;
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opcode_bits **last = &new_list;
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new_list = new_opcode_bits (old_bits->next,
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old_bits->value,
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old_bits->first,
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old_bits->last,
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old_bits->field,
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old_bits->opcode);
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while (*last != NULL)
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{
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int cmp = opcode_bit_cmp (new_bits, *last);
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if (cmp < 0) /* new < new_list */
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{
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break;
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}
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if (cmp == 0)
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{
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ERROR ("Duplicated insn bits in list");
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}
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last = &(*last)->next;
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}
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new_bits->next = *last;
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*last = new_bits;
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return new_list;
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}
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else
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{
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return new_bits;
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}
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}
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typedef enum {
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merge_duplicate_insns,
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report_duplicate_insns,
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} duplicate_insn_actions;
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static insn_list *
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insn_list_insert (insn_list **cur_insn_ptr,
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int *nr_insns,
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insn_entry *insn,
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opcode_bits *expanded_bits,
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opcode_field *opcodes,
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int nr_prefetched_words,
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duplicate_insn_actions duplicate_action)
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{
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/* insert it according to the order of the fields & bits */
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while ((*cur_insn_ptr) != NULL)
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{
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int word_cmp = insn_word_cmp (insn->words,
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(*cur_insn_ptr)->insn->words);
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if (word_cmp < 0)
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{
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/* found insertion point - new_insn < cur_insn->next */
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break;
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}
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else if (word_cmp == 0)
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{
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/* words same, try for bit fields */
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int bit_cmp = opcode_bits_cmp (expanded_bits,
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(*cur_insn_ptr)->expanded_bits);
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if (bit_cmp < 0)
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{
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/* found insertion point - new_insn < cur_insn->next */
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break;
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}
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else if (bit_cmp == 0)
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{
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switch (duplicate_action)
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{
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case report_duplicate_insns:
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/* two instructions with the same constant field
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values across all words and bits */
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warning (insn->line,
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"Location of second (duplicated?) instruction");
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error ((*cur_insn_ptr)->insn->line,
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"Two instructions with identical constant fields\n");
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case merge_duplicate_insns:
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/* Add the opcode path to the instructions list */
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if (opcodes != NULL)
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{
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insn_opcodes **last = &(*cur_insn_ptr)->opcodes;
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while (*last != NULL)
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{
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last = &(*last)->next;
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}
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(*last) = ZALLOC (insn_opcodes);
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(*last)->opcode = opcodes;
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}
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/* Use the larger nr_prefetched_words */
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if ((*cur_insn_ptr)->nr_prefetched_words < nr_prefetched_words)
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(*cur_insn_ptr)->nr_prefetched_words = nr_prefetched_words;
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return (*cur_insn_ptr);
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}
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}
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}
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/* keep looking - new_insn > cur_insn->next */
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cur_insn_ptr = &(*cur_insn_ptr)->next;
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}
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/* create a new list entry and insert it */
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{
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insn_list *new_insn = ZALLOC (insn_list);
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new_insn->insn = insn;
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new_insn->expanded_bits = expanded_bits;
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new_insn->next = (*cur_insn_ptr);
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new_insn->nr_prefetched_words = nr_prefetched_words;
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if (opcodes != NULL)
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{
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new_insn->opcodes = ZALLOC (insn_opcodes);
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new_insn->opcodes->opcode = opcodes;
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}
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(*cur_insn_ptr) = new_insn;
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}
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*nr_insns += 1;
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return (*cur_insn_ptr);
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}
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extern void
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gen_entry_traverse_tree (lf *file,
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gen_entry *table,
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int depth,
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gen_entry_handler *start,
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gen_entry_handler *leaf,
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gen_entry_handler *end,
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void *data)
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{
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gen_entry *entry;
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ASSERT (table != NULL);
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ASSERT (table->opcode != NULL);
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ASSERT (table->nr_entries > 0);
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ASSERT (table->entries != 0);
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/* prefix */
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if (start != NULL && depth >= 0)
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{
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start (file, table, depth, data);
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}
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/* infix leaves */
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for (entry = table->entries;
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entry != NULL;
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entry = entry->sibling)
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{
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if (entry->entries != NULL && depth != 0)
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{
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gen_entry_traverse_tree (file, entry, depth + 1,
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start, leaf, end, data);
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}
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else if (depth >= 0)
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{
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if (leaf != NULL)
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{
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leaf (file, entry, depth, data);
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}
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}
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}
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/* postfix */
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if (end != NULL && depth >= 0)
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{
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end (file, table, depth, data);
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}
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}
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/* create a list element containing a single gen_table entry */
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static gen_list *
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make_table (insn_table *isa,
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decode_table *rules,
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char *processor)
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{
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insn_entry *insn;
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gen_list *entry = ZALLOC (gen_list);
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entry->table = ZALLOC (gen_entry);
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entry->table->top = entry;
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entry->processor = processor;
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entry->isa = isa;
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for (insn = isa->insns; insn != NULL; insn = insn->next)
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{
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if (processor == NULL
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|| insn->processors == NULL
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|| filter_is_member (insn->processors, processor))
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{
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insn_list_insert (&entry->table->insns,
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&entry->table->nr_insns,
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insn,
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NULL, /* expanded_bits - none yet */
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NULL, /* opcodes - none yet */
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0, /* nr_prefetched_words - none yet */
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report_duplicate_insns);
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}
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}
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entry->table->opcode_rule = rules;
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return entry;
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}
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gen_table *
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make_gen_tables (insn_table *isa,
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decode_table *rules)
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{
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gen_table *gen = ZALLOC (gen_table);
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gen->isa = isa;
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gen->rules = rules;
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if (options.gen.multi_sim)
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{
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gen_list **last = &gen->tables;
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char *processor;
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filter *processors;
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if (options.model_filter != NULL)
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processors = options.model_filter;
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else
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processors = isa->model->processors;
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for (processor = filter_next (processors, "");
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processor != NULL;
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processor = filter_next (processors, processor))
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{
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*last = make_table (isa, rules, processor);
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last = &(*last)->next;
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}
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}
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else
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{
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gen->tables = make_table (isa, rules, NULL);
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}
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return gen;
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}
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/****************************************************************/
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#if 0
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typedef enum {
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field_is_not_constant = 0,
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field_constant_int = 1,
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field_constant_reserved = 2,
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field_constant_string = 3
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} constant_field_types;
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static constant_field_types
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insn_field_is_constant (insn_field *field,
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decode_table *rule)
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{
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switch (field->type)
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{
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case insn_field_int:
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/* field is an integer */
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return field_constant_int;
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case insn_field_reserved:
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/* field is `/' and treating that as a constant */
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if (rule->with_zero_reserved)
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return field_constant_reserved;
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else
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return field_is_not_constant;
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case insn_field_wild:
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return field_is_not_constant; /* never constant */
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case insn_field_string:
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/* field, though variable, is on the list of forced constants */
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if (filter_is_member (rule->constant_field_names, field->val_string))
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return field_constant_string;
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else
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return field_is_not_constant;
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}
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ERROR ("Internal error");
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return field_is_not_constant;
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}
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#endif
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/****************************************************************/
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/* Is the bit, according to the decode rule, identical across all the
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instructions? */
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static int
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insns_bit_useless (insn_list *insns,
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decode_table *rule,
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int bit_nr)
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{
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insn_list *entry;
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int value = -1;
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int is_useless = 1; /* cleared if something actually found */
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for (entry = insns; entry != NULL; entry = entry->next)
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{
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insn_word_entry *word = entry->insn->word[rule->word_nr];
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insn_bit_entry *bit = word->bit[bit_nr];
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switch (bit->field->type)
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{
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case insn_field_wild:
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case insn_field_reserved:
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/* neither useless or useful - ignore */
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break;
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case insn_field_int:
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switch (rule->search)
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{
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case decode_find_strings:
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/* an integer isn't a string */
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return 1;
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case decode_find_constants:
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case decode_find_mixed:
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/* an integer is useful if its value isn't the same
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between all instructions? */
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if (value < 0)
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value = bit->value;
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else if (value != bit->value)
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is_useless = 0;
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break;
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}
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break;
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case insn_field_string:
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switch (rule->search)
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{
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case decode_find_strings:
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/* at least one string, keep checking */
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is_useless = 0;
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break;
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case decode_find_constants:
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case decode_find_mixed:
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/* a string field forced to constant */
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if (filter_is_member (rule->constant_field_names,
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bit->field->val_string))
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is_useless = 0;
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else if (rule->search == decode_find_constants)
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/* the string field isn't constant */
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return 1;
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break;
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}
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}
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}
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return is_useless;
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}
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/* go through a gen-table's list of instruction formats looking for a
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range of bits that meet the decode table RULEs requirements */
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static opcode_field *
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gen_entry_find_opcode_field (insn_list *insns,
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decode_table *rule,
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int string_only)
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{
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opcode_field curr_opcode;
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ASSERT (rule != NULL);
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memset (&curr_opcode, 0, sizeof (curr_opcode));
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curr_opcode.word_nr = rule->word_nr;
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curr_opcode.first = rule->first;
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curr_opcode.last = rule->last;
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/* Try to reduce the size of first..last in accordance with the
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decode rules */
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|
|
while (curr_opcode.first <= rule->last)
|
|
{
|
|
if (insns_bit_useless (insns, rule, curr_opcode.first))
|
|
curr_opcode.first ++;
|
|
else
|
|
break;
|
|
}
|
|
while (curr_opcode.last >= rule->first)
|
|
{
|
|
if (insns_bit_useless (insns, rule, curr_opcode.last))
|
|
curr_opcode.last --;
|
|
else
|
|
break;
|
|
}
|
|
|
|
|
|
#if 0
|
|
for (entry = insns; entry != NULL; entry = entry->next)
|
|
{
|
|
insn_word_entry *fields = entry->insn->word[rule->word_nr];
|
|
opcode_field new_opcode;
|
|
|
|
ASSERT (fields != NULL);
|
|
|
|
/* find a start point for the opcode field */
|
|
new_opcode.first = rule->first;
|
|
while (new_opcode.first <= rule->last
|
|
&& (!string_only
|
|
|| (insn_field_is_constant(fields->bit[new_opcode.first], rule)
|
|
!= field_constant_string))
|
|
&& (string_only
|
|
|| (insn_field_is_constant(fields->bit[new_opcode.first], rule)
|
|
== field_is_not_constant)))
|
|
{
|
|
int new_first = fields->bit[new_opcode.first]->last + 1;
|
|
ASSERT (new_first > new_opcode.first);
|
|
new_opcode.first = new_first;
|
|
}
|
|
ASSERT(new_opcode.first > rule->last
|
|
|| (string_only
|
|
&& insn_field_is_constant(fields->bit[new_opcode.first],
|
|
rule) == field_constant_string)
|
|
|| (!string_only
|
|
&& insn_field_is_constant(fields->bit[new_opcode.first],
|
|
rule)));
|
|
|
|
/* find the end point for the opcode field */
|
|
new_opcode.last = rule->last;
|
|
while (new_opcode.last >= rule->first
|
|
&& (!string_only
|
|
|| insn_field_is_constant(fields->bit[new_opcode.last],
|
|
rule) != field_constant_string)
|
|
&& (string_only
|
|
|| !insn_field_is_constant(fields->bit[new_opcode.last],
|
|
rule)))
|
|
{
|
|
int new_last = fields->bit[new_opcode.last]->first - 1;
|
|
ASSERT (new_last < new_opcode.last);
|
|
new_opcode.last = new_last;
|
|
}
|
|
ASSERT(new_opcode.last < rule->first
|
|
|| (string_only
|
|
&& insn_field_is_constant(fields->bit[new_opcode.last],
|
|
rule) == field_constant_string)
|
|
|| (!string_only
|
|
&& insn_field_is_constant(fields->bit[new_opcode.last],
|
|
rule)));
|
|
|
|
/* now see if our current opcode needs expanding to include the
|
|
interesting fields within this instruction */
|
|
if (new_opcode.first <= rule->last
|
|
&& curr_opcode.first > new_opcode.first)
|
|
curr_opcode.first = new_opcode.first;
|
|
if (new_opcode.last >= rule->first
|
|
&& curr_opcode.last < new_opcode.last)
|
|
curr_opcode.last = new_opcode.last;
|
|
|
|
}
|
|
#endif
|
|
|
|
/* did the final opcode field end up being empty? */
|
|
if (curr_opcode.first > curr_opcode.last)
|
|
{
|
|
return NULL;
|
|
}
|
|
ASSERT (curr_opcode.last >= rule->first);
|
|
ASSERT (curr_opcode.first <= rule->last);
|
|
ASSERT (curr_opcode.first <= curr_opcode.last);
|
|
|
|
/* Ensure that, for the non string only case, the opcode includes
|
|
the range forced_first .. forced_last */
|
|
if (!string_only
|
|
&& curr_opcode.first > rule->force_first)
|
|
{
|
|
curr_opcode.first = rule->force_first;
|
|
}
|
|
if (!string_only
|
|
&& curr_opcode.last < rule->force_last)
|
|
{
|
|
curr_opcode.last = rule->force_last;
|
|
}
|
|
|
|
/* For the string only case, force just the lower bound (so that the
|
|
shift can be eliminated) */
|
|
if (string_only
|
|
&& rule->force_last == options.insn_bit_size - 1)
|
|
{
|
|
curr_opcode.last = options.insn_bit_size - 1;
|
|
}
|
|
|
|
/* handle any special cases */
|
|
switch (rule->type)
|
|
{
|
|
case normal_decode_rule:
|
|
/* let the above apply */
|
|
curr_opcode.nr_opcodes =
|
|
(1 << (curr_opcode.last - curr_opcode.first + 1));
|
|
break;
|
|
case boolean_rule:
|
|
curr_opcode.is_boolean = 1;
|
|
curr_opcode.boolean_constant = rule->constant;
|
|
curr_opcode.nr_opcodes = 2;
|
|
break;
|
|
}
|
|
|
|
{
|
|
opcode_field *new_field = ZALLOC (opcode_field);
|
|
memcpy (new_field, &curr_opcode, sizeof (opcode_field));
|
|
return new_field;
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
gen_entry_insert_insn (gen_entry *table,
|
|
insn_entry *old_insn,
|
|
int new_word_nr,
|
|
int new_nr_prefetched_words,
|
|
int new_opcode_nr,
|
|
opcode_bits *new_bits)
|
|
{
|
|
gen_entry **entry = &table->entries;
|
|
|
|
/* find the new table for this entry */
|
|
while ((*entry) != NULL && (*entry)->opcode_nr < new_opcode_nr)
|
|
{
|
|
entry = &(*entry)->sibling;
|
|
}
|
|
|
|
if ((*entry) == NULL || (*entry)->opcode_nr != new_opcode_nr)
|
|
{
|
|
/* insert the missing entry */
|
|
gen_entry *new_entry = ZALLOC (gen_entry);
|
|
new_entry->sibling = (*entry);
|
|
(*entry) = new_entry;
|
|
table->nr_entries++;
|
|
/* fill it in */
|
|
new_entry->top = table->top;
|
|
new_entry->opcode_nr = new_opcode_nr;
|
|
new_entry->word_nr = new_word_nr;
|
|
new_entry->expanded_bits = new_bits;
|
|
new_entry->opcode_rule = table->opcode_rule->next;
|
|
new_entry->parent = table;
|
|
new_entry->nr_prefetched_words = new_nr_prefetched_words;
|
|
}
|
|
/* ASSERT new_bits == cur_entry bits */
|
|
ASSERT ((*entry) != NULL && (*entry)->opcode_nr == new_opcode_nr);
|
|
insn_list_insert (&(*entry)->insns,
|
|
&(*entry)->nr_insns,
|
|
old_insn,
|
|
NULL, /* expanded_bits - only in final list */
|
|
NULL, /* opcodes - only in final list */
|
|
new_nr_prefetched_words, /* for this table */
|
|
report_duplicate_insns);
|
|
}
|
|
|
|
|
|
static void
|
|
gen_entry_expand_opcode (gen_entry *table,
|
|
insn_entry *instruction,
|
|
int bit_nr,
|
|
int opcode_nr,
|
|
opcode_bits *bits)
|
|
{
|
|
if (bit_nr > table->opcode->last)
|
|
{
|
|
/* Only include the hardwired bit information with an entry IF
|
|
that entry (and hence its functions) are being duplicated. */
|
|
if (table->opcode_rule->with_duplicates)
|
|
{
|
|
gen_entry_insert_insn (table, instruction,
|
|
table->opcode->word_nr,
|
|
table->nr_prefetched_words,
|
|
opcode_nr, bits);
|
|
}
|
|
else
|
|
{
|
|
gen_entry_insert_insn (table, instruction,
|
|
table->opcode->word_nr,
|
|
table->nr_prefetched_words,
|
|
opcode_nr, NULL);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
insn_word_entry *word = instruction->word[table->opcode->word_nr];
|
|
insn_field_entry *field = word->bit[bit_nr]->field;
|
|
int last_pos = ((field->last < table->opcode->last)
|
|
? field->last : table->opcode->last);
|
|
int first_pos = ((field->first > table->opcode->first)
|
|
? field->first : table->opcode->first);
|
|
int width = last_pos - first_pos + 1;
|
|
switch (field->type)
|
|
{
|
|
case insn_field_int:
|
|
{
|
|
int val;
|
|
val = sub_val (field->val_int, field, first_pos, last_pos);
|
|
gen_entry_expand_opcode (table, instruction,
|
|
last_pos + 1,
|
|
((opcode_nr << width) | val),
|
|
bits);
|
|
break;
|
|
}
|
|
default:
|
|
{
|
|
if (field->type == insn_field_reserved)
|
|
gen_entry_expand_opcode (table, instruction,
|
|
last_pos + 1,
|
|
((opcode_nr << width)),
|
|
bits);
|
|
else
|
|
{
|
|
int val;
|
|
int last_val = (table->opcode->is_boolean
|
|
? 2 : (1 << width));
|
|
for (val = 0; val < last_val; val++)
|
|
{
|
|
/* check to see if the value has been limited */
|
|
insn_field_exclusion *exclusion;
|
|
for (exclusion = field->exclusions;
|
|
exclusion != NULL;
|
|
exclusion = exclusion->next)
|
|
{
|
|
int value = sub_val (exclusion->value, field,
|
|
first_pos, last_pos);
|
|
if (value == val)
|
|
break;
|
|
}
|
|
if (exclusion == NULL)
|
|
{
|
|
/* Only add additional hardwired bit
|
|
information if the entry is not going to
|
|
later be combined */
|
|
if (table->opcode_rule->with_combine)
|
|
{
|
|
gen_entry_expand_opcode (table, instruction,
|
|
last_pos + 1,
|
|
((opcode_nr << width) | val),
|
|
bits);
|
|
}
|
|
else
|
|
{
|
|
opcode_bits *new_bits = new_opcode_bits (bits, val,
|
|
first_pos, last_pos,
|
|
field,
|
|
table->opcode);
|
|
gen_entry_expand_opcode (table, instruction,
|
|
last_pos + 1,
|
|
((opcode_nr << width) | val),
|
|
new_bits);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
gen_entry_insert_expanding (gen_entry *table,
|
|
insn_entry *instruction)
|
|
{
|
|
gen_entry_expand_opcode (table,
|
|
instruction,
|
|
table->opcode->first,
|
|
0,
|
|
table->expanded_bits);
|
|
}
|
|
|
|
|
|
static int
|
|
insns_match_format_names (insn_list *insns,
|
|
filter *format_names)
|
|
{
|
|
if (format_names != NULL)
|
|
{
|
|
insn_list *i;
|
|
for (i = insns; i != NULL; i = i->next)
|
|
{
|
|
if ( i->insn->format_name != NULL
|
|
&& !filter_is_member (format_names, i->insn->format_name))
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
table_matches_path (gen_entry *table,
|
|
decode_path_list *paths)
|
|
{
|
|
if (paths == NULL)
|
|
return 1;
|
|
while (paths != NULL)
|
|
{
|
|
gen_entry *entry = table;
|
|
decode_path *path = paths->path;
|
|
while (1)
|
|
{
|
|
if (entry == NULL && path == NULL)
|
|
return 1;
|
|
if (entry == NULL || path == NULL)
|
|
break;
|
|
if (entry->opcode_nr != path->opcode_nr)
|
|
break;
|
|
entry = entry->parent;
|
|
path = path->parent;
|
|
}
|
|
paths = paths->next;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
insns_match_conditions (insn_list *insns,
|
|
decode_cond *conditions)
|
|
{
|
|
if (conditions != NULL)
|
|
{
|
|
insn_list *i;
|
|
for (i = insns; i != NULL; i = i->next)
|
|
{
|
|
decode_cond *cond;
|
|
for (cond = conditions; cond != NULL; cond = cond->next)
|
|
{
|
|
int bit_nr;
|
|
if (i->insn->nr_words <= cond->word_nr)
|
|
return 0;
|
|
for (bit_nr = 0; bit_nr < options.insn_bit_size; bit_nr++)
|
|
{
|
|
if (!cond->mask[bit_nr])
|
|
continue;
|
|
if (!i->insn->word[cond->word_nr]->bit[bit_nr]->mask)
|
|
return 0;
|
|
if ((i->insn->word[cond->word_nr]->bit[bit_nr]->value
|
|
== cond->value[bit_nr])
|
|
== !cond->is_equal)
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
insns_match_nr_words (insn_list *insns,
|
|
int nr_words)
|
|
{
|
|
insn_list *i;
|
|
for (i = insns; i != NULL; i = i->next)
|
|
{
|
|
if (i->insn->nr_words < nr_words)
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
insn_list_cmp (insn_list *l,
|
|
insn_list *r)
|
|
{
|
|
while (1)
|
|
{
|
|
insn_entry *insn;
|
|
if (l == NULL && r == NULL)
|
|
return 0;
|
|
if (l == NULL)
|
|
return -1;
|
|
if (r == NULL)
|
|
return 1;
|
|
if (l->insn != r->insn)
|
|
return -1; /* somewhat arbitrary at present */
|
|
/* skip this insn */
|
|
insn = l->insn;
|
|
while (l != NULL && l->insn == insn)
|
|
l = l->next;
|
|
while (r != NULL && r->insn == insn)
|
|
r = r->next;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
gen_entry_expand_insns (gen_entry *table)
|
|
{
|
|
decode_table *opcode_rule;
|
|
|
|
ASSERT(table->nr_insns >= 1);
|
|
|
|
/* determine a valid opcode */
|
|
for (opcode_rule = table->opcode_rule;
|
|
opcode_rule != NULL;
|
|
opcode_rule = opcode_rule->next)
|
|
{
|
|
char *discard_reason;
|
|
if (table->top->processor != NULL
|
|
&& opcode_rule->model_names != NULL
|
|
&& !filter_is_member (opcode_rule->model_names,
|
|
table->top->processor))
|
|
{
|
|
/* the rule isn't applicable to this processor */
|
|
discard_reason = "wrong model";
|
|
}
|
|
else if (table->nr_insns == 1 && opcode_rule->conditions == NULL)
|
|
{
|
|
/* for safety, require a pre-codition when attempting to
|
|
apply a rule to a single instruction */
|
|
discard_reason = "need pre-condition when nr-insn == 1";
|
|
}
|
|
else if (table->nr_insns == 1 && !opcode_rule->with_duplicates)
|
|
{
|
|
/* Little point in expanding a single instruction when we're
|
|
not duplicating the semantic functions that this table
|
|
calls */
|
|
discard_reason = "need duplication with nr-insns == 1";
|
|
}
|
|
else if (!insns_match_format_names (table->insns, opcode_rule->format_names))
|
|
{
|
|
discard_reason = "wrong format name";
|
|
}
|
|
else if (!insns_match_nr_words (table->insns, opcode_rule->word_nr + 1))
|
|
{
|
|
discard_reason = "wrong nr words";
|
|
}
|
|
else if (!table_matches_path (table, opcode_rule->paths))
|
|
{
|
|
discard_reason = "path failed";
|
|
}
|
|
else if (!insns_match_conditions (table->insns, opcode_rule->conditions))
|
|
{
|
|
discard_reason = "condition failed";
|
|
}
|
|
else
|
|
{
|
|
discard_reason = "no opcode field";
|
|
table->opcode =
|
|
gen_entry_find_opcode_field (table->insns,
|
|
opcode_rule,
|
|
table->nr_insns == 1/*string-only*/
|
|
);
|
|
if (table->opcode != NULL)
|
|
{
|
|
table->opcode_rule = opcode_rule;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (options.trace.rule_rejection)
|
|
{
|
|
print_gen_entry_path (opcode_rule->line, table, notify);
|
|
notify (NULL, ": rule discarded - %s\n", discard_reason);
|
|
}
|
|
}
|
|
|
|
/* did we find anything */
|
|
if (opcode_rule == NULL)
|
|
{
|
|
/* the decode table failed, this set of instructions haven't
|
|
been uniquely identified */
|
|
if (table->nr_insns > 1)
|
|
{
|
|
print_gen_entry_insns (table, warning,
|
|
"was not uniquely decoded",
|
|
"decodes to the same entry");
|
|
error (NULL, "");
|
|
}
|
|
return;
|
|
}
|
|
|
|
/* Determine the number of words that must have been prefetched for
|
|
this table to function */
|
|
if (table->parent == NULL)
|
|
table->nr_prefetched_words = table->opcode_rule->word_nr + 1;
|
|
else if (table->opcode_rule->word_nr + 1 > table->parent->nr_prefetched_words)
|
|
table->nr_prefetched_words = table->opcode_rule->word_nr + 1;
|
|
else
|
|
table->nr_prefetched_words = table->parent->nr_prefetched_words;
|
|
|
|
/* back link what we found to its parent */
|
|
if (table->parent != NULL)
|
|
{
|
|
ASSERT(table->parent->opcode != NULL);
|
|
table->opcode->parent = table->parent->opcode;
|
|
}
|
|
|
|
/* expand the raw instructions according to the opcode */
|
|
{
|
|
insn_list *entry;
|
|
for (entry = table->insns; entry != NULL; entry = entry->next)
|
|
{
|
|
gen_entry_insert_expanding (table, entry->insn);
|
|
}
|
|
}
|
|
|
|
if (options.trace.rule_selection)
|
|
{
|
|
print_gen_entry_path (table->opcode_rule->line, table, notify);
|
|
notify (NULL,
|
|
": decode - word %d, bits [%d..%d] in [%d..%d], opcodes %d, entries %d\n",
|
|
table->opcode->word_nr,
|
|
i2target (options.hi_bit_nr, table->opcode->first),
|
|
i2target (options.hi_bit_nr, table->opcode->last),
|
|
i2target (options.hi_bit_nr, table->opcode_rule->first),
|
|
i2target (options.hi_bit_nr, table->opcode_rule->last),
|
|
table->opcode->nr_opcodes,
|
|
table->nr_entries);
|
|
}
|
|
|
|
/* dump the results */
|
|
if (options.trace.entries)
|
|
{
|
|
gen_entry *entry;
|
|
for (entry = table->entries; entry != NULL; entry = entry->sibling)
|
|
{
|
|
insn_list *l;
|
|
print_gen_entry_path (table->opcode_rule->line, entry, notify);
|
|
notify (NULL, ": %d - entries %d -",
|
|
entry->opcode_nr,
|
|
entry->nr_insns);
|
|
for (l = entry->insns; l != NULL; l = l->next)
|
|
notify (NULL, " %s.%s", l->insn->format_name, l->insn->name);
|
|
notify (NULL, "\n");
|
|
}
|
|
}
|
|
|
|
/* perform a combine pass if needed */
|
|
if (table->opcode_rule->with_combine)
|
|
{
|
|
gen_entry *entry;
|
|
for (entry = table->entries; entry != NULL; entry = entry->sibling)
|
|
{
|
|
if (entry->combined_parent == NULL)
|
|
{
|
|
gen_entry **last = &entry->combined_next;
|
|
gen_entry *alt;
|
|
for (alt = entry->sibling; alt != NULL; alt = alt->sibling)
|
|
{
|
|
if (alt->combined_parent == NULL
|
|
&& insn_list_cmp (entry->insns, alt->insns) == 0)
|
|
{
|
|
alt->combined_parent = entry;
|
|
*last = alt;
|
|
last = &alt->combined_next;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (options.trace.combine)
|
|
{
|
|
int nr_unique = 0;
|
|
gen_entry *entry;
|
|
for (entry = table->entries; entry != NULL; entry = entry->sibling)
|
|
{
|
|
if (entry->combined_parent == NULL)
|
|
{
|
|
insn_list *l;
|
|
gen_entry *duplicate;
|
|
nr_unique++;
|
|
print_gen_entry_path (table->opcode_rule->line, entry, notify);
|
|
for (duplicate = entry->combined_next;
|
|
duplicate != NULL;
|
|
duplicate = duplicate->combined_next)
|
|
{
|
|
notify (NULL, "+%d", duplicate->opcode_nr);
|
|
}
|
|
notify (NULL, ": entries %d -", entry->nr_insns);
|
|
for (l = entry->insns; l != NULL; l = l->next)
|
|
{
|
|
notify (NULL, " %s.%s",
|
|
l->insn->format_name,
|
|
l->insn->name);
|
|
}
|
|
notify (NULL, "\n");
|
|
}
|
|
}
|
|
print_gen_entry_path (table->opcode_rule->line, table, notify);
|
|
notify (NULL, ": combine - word %d, bits [%d..%d] in [%d..%d], opcodes %d, entries %d, unique %d\n",
|
|
table->opcode->word_nr,
|
|
i2target (options.hi_bit_nr, table->opcode->first),
|
|
i2target (options.hi_bit_nr, table->opcode->last),
|
|
i2target (options.hi_bit_nr, table->opcode_rule->first),
|
|
i2target (options.hi_bit_nr, table->opcode_rule->last),
|
|
table->opcode->nr_opcodes,
|
|
table->nr_entries,
|
|
nr_unique);
|
|
}
|
|
}
|
|
|
|
/* Check that the rule did more than re-arange the order of the
|
|
instructions */
|
|
{
|
|
gen_entry *entry;
|
|
for (entry = table->entries; entry != NULL; entry = entry->sibling)
|
|
{
|
|
if (entry->combined_parent == NULL)
|
|
{
|
|
if (insn_list_cmp (table->insns, entry->insns) == 0)
|
|
{
|
|
print_gen_entry_path (table->opcode_rule->line, table, warning);
|
|
warning (NULL, ": Applying rule just copied all instructions\n");
|
|
print_gen_entry_insns (entry, warning, "Copied", NULL);
|
|
error (NULL, "");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* if some form of expanded table, fill in the missing dots */
|
|
switch (table->opcode_rule->gen)
|
|
{
|
|
case padded_switch_gen:
|
|
case array_gen:
|
|
case goto_switch_gen:
|
|
if (!table->opcode->is_boolean)
|
|
{
|
|
gen_entry **entry = &table->entries;
|
|
gen_entry *illegals = NULL;
|
|
gen_entry **last_illegal = &illegals;
|
|
int opcode_nr = 0;
|
|
while (opcode_nr < table->opcode->nr_opcodes)
|
|
{
|
|
if ((*entry) == NULL || (*entry)->opcode_nr != opcode_nr)
|
|
{
|
|
/* missing - insert it under our feet at *entry */
|
|
gen_entry_insert_insn (table,
|
|
table->top->isa->illegal_insn,
|
|
table->opcode->word_nr,
|
|
0, /* nr_prefetched_words == 0 for invalid */
|
|
opcode_nr, NULL);
|
|
ASSERT ((*entry) != NULL);
|
|
ASSERT ((*entry)->opcode_nr == opcode_nr);
|
|
(*last_illegal) = *entry;
|
|
(*last_illegal)->combined_parent = illegals;
|
|
last_illegal = &(*last_illegal)->combined_next;
|
|
}
|
|
entry = &(*entry)->sibling;
|
|
opcode_nr++;
|
|
}
|
|
/* oops, will have pointed the first illegal insn back to
|
|
its self. Fix this */
|
|
if (illegals != NULL)
|
|
illegals->combined_parent = NULL;
|
|
}
|
|
break;
|
|
case switch_gen:
|
|
case invalid_gen:
|
|
/* ignore */
|
|
break;
|
|
}
|
|
|
|
/* and do the same for the newly created sub entries but *only*
|
|
expand entries that haven't been combined. */
|
|
{
|
|
gen_entry *entry;
|
|
for (entry = table->entries; entry != NULL; entry = entry->sibling)
|
|
{
|
|
if (entry->combined_parent == NULL)
|
|
{
|
|
gen_entry_expand_insns (entry);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
gen_tables_expand_insns (gen_table *gen)
|
|
{
|
|
gen_list *entry;
|
|
for (entry = gen->tables; entry != NULL; entry = entry->next)
|
|
{
|
|
gen_entry_expand_insns (entry->table);
|
|
}
|
|
}
|
|
|
|
|
|
/* create a list of all the semantic functions that need to be
|
|
generated. Eliminate any duplicates. Verify that the decode stage
|
|
worked. */
|
|
|
|
static void
|
|
make_gen_semantics_list (lf *file,
|
|
gen_entry *entry,
|
|
int depth,
|
|
void *data)
|
|
{
|
|
gen_table *gen = (gen_table*) data;
|
|
insn_list *insn;
|
|
/* Not interested in an entrie that have been combined into some
|
|
other entry at the same level */
|
|
if (entry->combined_parent != NULL)
|
|
return;
|
|
|
|
/* a leaf should contain exactly one instruction. If not the decode
|
|
stage failed. */
|
|
ASSERT (entry->nr_insns == 1);
|
|
|
|
/* Enter this instruction into the list of semantic functions. */
|
|
insn = insn_list_insert (&gen->semantics, &gen->nr_semantics,
|
|
entry->insns->insn,
|
|
entry->expanded_bits,
|
|
entry->parent->opcode,
|
|
entry->insns->nr_prefetched_words,
|
|
merge_duplicate_insns);
|
|
/* point the table entry at the real semantic function */
|
|
ASSERT (insn != NULL);
|
|
entry->insns->semantic = insn;
|
|
}
|
|
|
|
|
|
void
|
|
gen_tables_expand_semantics (gen_table *gen)
|
|
{
|
|
gen_list *entry;
|
|
for (entry = gen->tables; entry != NULL; entry = entry->next)
|
|
{
|
|
gen_entry_traverse_tree (NULL,
|
|
entry->table,
|
|
1, /* depth */
|
|
NULL, /* start-handler */
|
|
make_gen_semantics_list, /* leaf-handler */
|
|
NULL, /* end-handler */
|
|
gen); /* data */
|
|
}
|
|
}
|
|
|
|
|
|
|
|
#ifdef MAIN
|
|
|
|
|
|
static void
|
|
dump_opcode_field (lf *file,
|
|
char *prefix,
|
|
opcode_field *field,
|
|
char *suffix,
|
|
int levels)
|
|
{
|
|
lf_printf (file, "%s(opcode_field *) 0x%lx", prefix, (long) field);
|
|
if (levels && field != NULL) {
|
|
lf_indent (file, +1);
|
|
lf_printf (file, "\n(first %d)", field->first);
|
|
lf_printf (file, "\n(last %d)", field->last);
|
|
lf_printf (file, "\n(nr_opcodes %d)", field->nr_opcodes);
|
|
lf_printf (file, "\n(is_boolean %d)", field->is_boolean);
|
|
lf_printf (file, "\n(boolean_constant %d)", field->boolean_constant);
|
|
dump_opcode_field(file, "\n(parent ", field->parent, ")", levels - 1);
|
|
lf_indent (file, -1);
|
|
}
|
|
lf_printf (file, "%s", suffix);
|
|
}
|
|
|
|
|
|
static void
|
|
dump_opcode_bits (lf *file,
|
|
char *prefix,
|
|
opcode_bits *bits,
|
|
char *suffix,
|
|
int levels)
|
|
{
|
|
lf_printf (file, "%s(opcode_bits *) 0x%lx", prefix, (long) bits);
|
|
|
|
if (levels && bits != NULL)
|
|
{
|
|
lf_indent (file, +1);
|
|
lf_printf (file, "\n(value %d)", bits->value);
|
|
dump_opcode_field (file, "\n(opcode ", bits->opcode, ")", 0);
|
|
dump_insn_field (file, "\n(field ", bits->field, ")");
|
|
dump_opcode_bits (file, "\n(next ", bits->next, ")", levels - 1);
|
|
lf_indent (file, -1);
|
|
}
|
|
lf_printf (file, "%s", suffix);
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
dump_insn_list (lf *file,
|
|
char *prefix,
|
|
insn_list *entry,
|
|
char *suffix)
|
|
{
|
|
lf_printf (file, "%s(insn_list *) 0x%lx", prefix, (long) entry);
|
|
|
|
if (entry != NULL) {
|
|
lf_indent (file, +1);
|
|
dump_insn_entry (file, "\n(insn ", entry->insn, ")");
|
|
lf_printf (file, "\n(next 0x%lx)", (long) entry->next);
|
|
lf_indent (file, -1);
|
|
}
|
|
lf_printf (file, "%s", suffix);
|
|
}
|
|
|
|
|
|
static void
|
|
dump_insn_word_entry_list_entries (lf *file,
|
|
char *prefix,
|
|
insn_list *entry,
|
|
char *suffix)
|
|
{
|
|
lf_printf (file, "%s", prefix);
|
|
while (entry != NULL)
|
|
{
|
|
dump_insn_list (file, "\n(", entry, ")");
|
|
entry = entry->next;
|
|
}
|
|
lf_printf (file, "%s", suffix);
|
|
}
|
|
|
|
|
|
static void
|
|
dump_gen_entry (lf *file,
|
|
char *prefix,
|
|
gen_entry *table,
|
|
char *suffix,
|
|
int levels)
|
|
{
|
|
|
|
lf_printf (file, "%s(gen_entry *) 0x%lx", prefix, (long) table);
|
|
|
|
if (levels && table != NULL) {
|
|
|
|
lf_indent (file, +1);
|
|
lf_printf (file, "\n(opcode_nr %d)", table->opcode_nr);
|
|
lf_printf (file, "\n(word_nr %d)", table->word_nr);
|
|
dump_opcode_bits (file, "\n(expanded_bits ", table->expanded_bits, ")", -1);
|
|
lf_printf (file, "\n(nr_insns %d)", table->nr_insns);
|
|
dump_insn_word_entry_list_entries (file, "\n(insns ", table->insns, ")");
|
|
dump_decode_rule (file, "\n(opcode_rule ", table->opcode_rule, ")");
|
|
dump_opcode_field (file, "\n(opcode ", table->opcode, ")", 0);
|
|
lf_printf (file, "\n(nr_entries %d)", table->nr_entries);
|
|
dump_gen_entry (file, "\n(entries ", table->entries, ")", table->nr_entries);
|
|
dump_gen_entry (file, "\n(sibling ", table->sibling, ")", levels - 1);
|
|
dump_gen_entry (file, "\n(parent ", table->parent, ")", 0);
|
|
lf_indent (file, -1);
|
|
}
|
|
lf_printf (file, "%s", suffix);
|
|
}
|
|
|
|
static void
|
|
dump_gen_list (lf *file,
|
|
char *prefix,
|
|
gen_list *entry,
|
|
char *suffix,
|
|
int levels)
|
|
{
|
|
while (entry != NULL)
|
|
{
|
|
lf_printf (file, "%s(gen_list *) 0x%lx", prefix, (long) entry);
|
|
dump_gen_entry (file, "\n(", entry->table, ")", levels);
|
|
lf_printf (file, "\n(next (gen_list *) 0x%lx)", (long) entry->next);
|
|
lf_printf (file, "%s", suffix);
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
dump_gen_table (lf *file,
|
|
char *prefix,
|
|
gen_table *gen,
|
|
char *suffix,
|
|
int levels)
|
|
{
|
|
lf_printf (file, "%s(gen_table *) 0x%lx", prefix, (long) gen);
|
|
lf_printf (file, "\n(isa (insn_table *) 0x%lx)", (long) gen->isa);
|
|
lf_printf (file, "\n(rules (decode_table *) 0x%lx)", (long) gen->rules);
|
|
dump_gen_list (file, "\n(", gen->tables, ")", levels);
|
|
lf_printf (file, "%s", suffix);
|
|
}
|
|
|
|
|
|
igen_options options;
|
|
|
|
int
|
|
main (int argc,
|
|
char **argv)
|
|
{
|
|
decode_table *decode_rules;
|
|
insn_table *instructions;
|
|
gen_table *gen;
|
|
lf *l;
|
|
|
|
if (argc != 7)
|
|
error (NULL, "Usage: insn <filter-in> <hi-bit-nr> <insn-bit-size> <widths> <decode-table> <insn-table>\n");
|
|
|
|
INIT_OPTIONS (options);
|
|
|
|
filter_parse (&options.flags_filter, argv[1]);
|
|
|
|
options.hi_bit_nr = a2i(argv[2]);
|
|
options.insn_bit_size = a2i(argv[3]);
|
|
options.insn_specifying_widths = a2i(argv[4]);
|
|
ASSERT(options.hi_bit_nr < options.insn_bit_size);
|
|
|
|
instructions = load_insn_table (argv[6], NULL);
|
|
decode_rules = load_decode_table (argv[5]);
|
|
gen = make_gen_tables (instructions, decode_rules);
|
|
|
|
gen_tables_expand_insns (gen);
|
|
|
|
l = lf_open ("-", "stdout", lf_omit_references, lf_is_text, "tmp-ld-insn");
|
|
|
|
dump_gen_table (l, "(", gen, ")\n", -1);
|
|
return 0;
|
|
}
|
|
|
|
#endif
|