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https://git.code.sf.net/p/quake/quakeforge
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a5304461dd
The singleton alias resulted in the adjusted swizzles being corrupted when for the same def. Other than adding properly sized swizzles (planned), the simplest solution is to (separately) allow alias that stick out from from the def.
357 lines
8.6 KiB
C
357 lines
8.6 KiB
C
/*
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emit.c
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statement emittion
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Copyright (C) 2001 Bill Currie <bill@taniwha.org>
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Author: Bill Currie <bill@taniwha.org>
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Date: 2001/07/26
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (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.
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See the 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:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#include <stdlib.h>
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#include <QF/mathlib.h>
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#include <QF/va.h>
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#include "tools/qfcc/include/codespace.h"
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#include "tools/qfcc/include/def.h"
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#include "tools/qfcc/include/defspace.h"
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#include "tools/qfcc/include/debug.h"
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#include "tools/qfcc/include/diagnostic.h"
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#include "tools/qfcc/include/emit.h"
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#include "tools/qfcc/include/function.h"
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#include "tools/qfcc/include/opcodes.h"
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#include "tools/qfcc/include/options.h"
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#include "tools/qfcc/include/qfcc.h"
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#include "tools/qfcc/include/reloc.h"
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#include "tools/qfcc/include/statements.h"
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#include "tools/qfcc/include/symtab.h"
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#include "tools/qfcc/include/type.h"
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#include "tools/qfcc/include/value.h"
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static def_t zero_def;
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static def_t *get_operand_def (expr_t *expr, operand_t *op);
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static def_t *
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get_tempop_def (expr_t *expr, operand_t *tmpop, type_t *type)
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{
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tempop_t *tempop = &tmpop->tempop;
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if (tempop->def) {
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return tempop->def;
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}
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if (tempop->alias) {
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def_t *tdef = get_operand_def (expr, tempop->alias);
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int offset = tempop->offset;
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tempop->def = alias_def (tdef, type, offset);
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}
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if (!tempop->def) {
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tempop->def = temp_def (type);
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}
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return tempop->def;
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}
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static def_t *
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get_value_def (expr_t *expr, ex_value_t *value, type_t *type)
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{
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def_t *def;
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if (is_short (type)) {
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def = new_def (0, &type_short, 0, sc_extern);
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def->offset = value->v.short_val;
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return def;
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}
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if (is_ptr (type) && value->v.pointer.tempop && !value->v.pointer.def) {
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value->v.pointer.def = get_tempop_def (expr, value->v.pointer.tempop,
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type->t.fldptr.type);
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}
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def = emit_value (value, 0);
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if (type != def->type)
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return alias_def (def, type, 0);
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return def;
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}
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static def_t *
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get_operand_def (expr_t *expr, operand_t *op)
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{
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if (!op)
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return 0;
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switch (op->op_type) {
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case op_def:
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return op->def;
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case op_value:
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return get_value_def (expr, op->value, op->type);
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case op_label:
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op->type = &type_short;
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zero_def.type = &type_short;
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return &zero_def; //FIXME
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case op_temp:
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return get_tempop_def (expr, op, op->type);
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case op_alias:
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return get_operand_def (expr, op->alias);
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case op_nil:
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internal_error (expr, "unexpected nil operand");
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case op_pseudo:
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internal_error (expr, "unexpected pseudo operand");
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}
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internal_error (expr, "unexpected operand");
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return 0;
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}
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static void
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add_statement_def_ref (def_t *def, dstatement_t *st, int field)
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{
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if (def) {
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int st_ofs = st - pr.code->code;
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int offset_reloc = 0;
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int alias_depth = 0;
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expr_t alias_depth_expr;
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alias_depth_expr.file = def->file;
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alias_depth_expr.line = def->line;
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while (def->alias) {
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alias_depth++;
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offset_reloc |= def->offset_reloc;
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def = def->alias;
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}
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if (alias_depth > 1) {
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internal_error (&alias_depth_expr, "alias chain detected: %d %s",
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alias_depth, def->name);
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}
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if (offset_reloc)
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reloc_op_def_ofs (def, st_ofs, field);
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else
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reloc_op_def (def, st_ofs, field);
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}
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}
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static void
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add_statement_op_ref (operand_t *op, dstatement_t *st, int field)
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{
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if (op && op->op_type == op_label) {
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int st_ofs = st - pr.code->code;
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reloc_t *reloc = new_reloc (0, st_ofs, rel_op_a_op + field);
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reloc->next = op->label->dest->relocs;
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op->label->dest->relocs = reloc;
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}
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}
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static void
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use_tempop (operand_t *op, expr_t *expr)
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{
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if (!op || op->op_type != op_temp)
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return;
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while (op->tempop.alias)
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op = op->tempop.alias;
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if (--op->tempop.users == 0)
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free_temp_def (op->tempop.def);
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if (op->tempop.users <= -1)
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bug (expr, "temp users went negative: %s", operand_string (op));
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}
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static def_t *
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cover_def_32 (def_t *def, int *adj)
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{
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int offset = def->offset;
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def_t *cover = def;
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if (def->alias) {
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offset += def->alias->offset;
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}
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*adj = offset & 3;
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if (offset & 3) {
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if (def->alias) {
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cover = cover_alias_def (def->alias, def->type,
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def->offset - (offset & 3));
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} else {
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cover = cover_alias_def (def, def->type, -(offset & 3));
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}
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}
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return cover;
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}
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static def_t *
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cover_def_64 (def_t *def, int *adj)
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{
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int offset = def->offset;
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def_t *cover = def;
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if (def->alias) {
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offset += def->alias->offset;
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}
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if (offset & 1) {
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internal_error (0, "misaligned 64-bit swizzle source");
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}
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*adj = (offset & 6) >> 1;
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if (offset & 6) {
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if (def->alias) {
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cover = cover_alias_def (def->alias, def->type,
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def->offset - (offset & 6));
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} else {
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cover = cover_alias_def (def, def->type, -(offset & 6));
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}
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}
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return cover;
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}
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static def_t *
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cover_def (def_t *def, int *adj)
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{
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if (type_size (base_type (def->type)) == 1) {
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return cover_def_32 (def, adj);
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} else {
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return cover_def_64 (def, adj);
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}
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}
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static void
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adjust_swizzle (def_t *def, int adj)
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{
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pr_ushort_t swiz = def->offset;
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for (int i = 0; i < 8; i += 2) {
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pr_ushort_t mask = 3 << i;
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pr_ushort_t ind = swiz & mask;
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swiz &= ~mask;
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swiz |= (ind + (adj << i)) & mask;
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}
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def->offset = swiz;
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}
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static void
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emit_statement (statement_t *statement)
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{
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const char *opcode = statement->opcode;
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operand_t *op_a, *op_b, *op_c;
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def_t *def_a, *def_b, *def_c;
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instruction_t *inst;
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dstatement_t *s;
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if (options.code.progsversion < PROG_VERSION
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&& (strcmp (statement->opcode, "store") == 0
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|| strcmp (statement->opcode, "assign") == 0
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|| statement_is_cond (statement))) {
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// the operands for assign, store and branch instructions are rotated
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// when comparing v6/v6p and ruamoko
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op_a = statement->opc;
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op_b = statement->opa;
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op_c = statement->opb;
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} else {
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op_a = statement->opa;
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op_b = statement->opb;
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op_c = statement->opc;
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}
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def_a = get_operand_def (statement->expr, op_a);
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use_tempop (op_a, statement->expr);
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def_b = get_operand_def (statement->expr, op_b);
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use_tempop (op_b, statement->expr);
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def_c = get_operand_def (statement->expr, op_c);
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use_tempop (op_c, statement->expr);
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if (strcmp (opcode, "swizzle") == 0) {
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op_c->type = float_type (op_c->type);
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op_a->type = float_type (op_a->type);
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if (!op_c->type || !op_a->type) {
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internal_error (statement->expr, "invalid types in swizzle");
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}
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if (op_a->width < 4) {
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int adj;
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def_a = cover_def (def_a, &adj);
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adjust_swizzle (def_b, adj);
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op_a->width = 4;
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}
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}
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inst = opcode_find (opcode, op_a, op_b, op_c);
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if (!inst) {
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print_expr (statement->expr);
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printf ("%d ", pr.code->size);
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print_statement (statement);
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internal_error (statement->expr, "ice ice baby");
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}
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if (options.code.debug) {
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expr_t *e = statement->expr;
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pr_uint_t line = (e ? e->line : pr.source_line) - lineno_base;
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if (line != pr.linenos[pr.num_linenos - 1].line) {
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pr_lineno_t *lineno = new_lineno ();
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lineno->line = line;
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lineno->fa.addr = pr.code->size;
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}
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}
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s = codespace_newstatement (pr.code);
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memset (s, 0, sizeof (*s));
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s->op = opcode_get (inst);
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if (def_a) {
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s->a = def_a->offset;
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s->op |= ((def_a->reg) << OP_A_SHIFT) & OP_A_BASE;
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}
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if (def_b) {
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s->b = def_b->offset;
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s->op |= ((def_b->reg) << OP_B_SHIFT) & OP_B_BASE;
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}
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if (def_c) {
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s->c = def_c->offset;
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s->op |= ((def_c->reg) << OP_C_SHIFT) & OP_C_BASE;
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}
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if (options.verbosity >= 2) {
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opcode_print_statement (pr.code->size - 1, s);
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}
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add_statement_def_ref (def_a, s, 0);
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add_statement_def_ref (def_b, s, 1);
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add_statement_def_ref (def_c, s, 2);
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add_statement_op_ref (op_a, s, 0);
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add_statement_op_ref (op_b, s, 1);
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add_statement_op_ref (op_c, s, 2);
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}
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void
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emit_statements (sblock_t *first_sblock)
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{
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sblock_t *sblock;
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statement_t *s;
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for (sblock = first_sblock; sblock; sblock = sblock->next) {
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sblock->offset = pr.code->size;
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for (s = sblock->statements; s; s = s->next)
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emit_statement (s);
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}
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for (sblock = first_sblock; sblock; sblock = sblock->next)
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relocate_refs (sblock->relocs, sblock->offset);
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}
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