2 * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief This file contains functions for matching firm graphs for
23 * nodes that can be used as addressmode for x86 commands
24 * @author Matthias Braun
31 #include "ia32_address_mode.h"
32 #include "ia32_transform.h"
38 #include "iredges_t.h"
41 #include "../benode_t.h"
45 /* gas/ld don't support negative symconsts :-( */
46 #undef SUPPORT_NEGATIVE_SYMCONSTS
48 static bitset_t *non_address_mode_nodes;
50 static int do_is_immediate(const ir_node *node, int *symconsts, int negate)
55 switch(get_irn_opcode(node)) {
57 if(!tarval_is_long(get_Const_tarval(node))) {
59 ir_fprintf(stderr, "Optimisation warning tarval of %+F is not a "
66 #ifndef SUPPORT_NEGATIVE_SYMCONSTS
67 /* unfortunately the assembler/linker doesn't support -symconst */
72 if(get_SymConst_kind(node) != symconst_addr_ent)
81 if(bitset_is_set(non_address_mode_nodes, get_irn_idx(node)))
84 left = get_binop_left(node);
85 right = get_binop_right(node);
86 if(!do_is_immediate(left, symconsts, negate))
88 if(!do_is_immediate(right, symconsts, is_Sub(node) ? !negate : negate))
99 static int is_immediate_simple(const ir_node *node)
102 return do_is_immediate(node, &symconsts, 0);
105 static int is_immediate(ia32_address_t *addr, const ir_node *node, int negate)
108 if(addr->symconst_ent != NULL)
111 return do_is_immediate(node, &symconsts, negate);
114 static void eat_immediate(ia32_address_t *addr, ir_node *node, int negate)
120 switch(get_irn_opcode(node)) {
122 tv = get_Const_tarval(node);
123 long val = get_tarval_long(tv);
131 if(addr->symconst_ent != NULL) {
132 panic("Internal error: more than 1 symconst in address "
135 addr->symconst_ent = get_SymConst_entity(node);
136 #ifndef SUPPORT_NEGATIVE_SYMCONSTS
139 addr->symconst_sign = negate;
142 assert(!bitset_is_set(non_address_mode_nodes, get_irn_idx(node)));
143 left = get_Add_left(node);
144 right = get_Add_right(node);
145 eat_immediate(addr, left, negate);
146 eat_immediate(addr, right, negate);
149 assert(!bitset_is_set(non_address_mode_nodes, get_irn_idx(node)));
150 left = get_Sub_left(node);
151 right = get_Sub_right(node);
152 eat_immediate(addr, left, negate);
153 eat_immediate(addr, right, !negate);
156 panic("Internal error in immediate address calculation");
160 static ir_node *eat_immediates(ia32_address_t *addr, ir_node *node, int force)
162 if(!force && bitset_is_set(non_address_mode_nodes, get_irn_idx(node)))
166 ir_node *left = get_Add_left(node);
167 ir_node *right = get_Add_right(node);
169 if(is_immediate(addr, left, 0)) {
170 eat_immediate(addr, left, 0);
171 return eat_immediates(addr, right, 0);
173 if(is_immediate(addr, right, 0)) {
174 eat_immediate(addr, right, 0);
175 return eat_immediates(addr, left, 0);
177 } else if(is_Sub(node)) {
178 ir_node *left = get_Sub_left(node);
179 ir_node *right = get_Sub_right(node);
181 if(is_immediate(addr, right, 1)) {
182 eat_immediate(addr, right, 1);
183 return eat_immediates(addr, left, 0);
190 static int eat_shl(ia32_address_t *addr, ir_node *node)
192 ir_node *right = get_Shl_right(node);
196 /* we can only eat a shl if we don't have a scale or index set */
197 if(addr->scale != 0 || addr->index != NULL)
200 /* we can use shl with 1, 2 or 3 shift */
203 tv = get_Const_tarval(right);
204 if(!tarval_is_long(tv))
206 val = get_tarval_long(tv);
207 if(val < 0 || val > 3)
210 ir_fprintf(stderr, "Optimisation warning: unoptimized Shl(,0) found\n");
212 if(bitset_is_set(non_address_mode_nodes, get_irn_idx(node)))
215 #ifndef AGGRESSIVE_AM
216 if(get_irn_n_edges(node) > 1)
221 addr->index = eat_immediates(addr, get_Shl_left(node), 0);
225 void ia32_create_address_mode(ia32_address_t *addr, ir_node *node, int force)
230 if(is_immediate(addr, node, 0)) {
231 eat_immediate(addr, node, 0);
235 #ifndef AGGRESSIVE_AM
236 if(!force && get_irn_n_edges(node) > 1) {
242 if(!force && bitset_is_set(non_address_mode_nodes, get_irn_idx(node))) {
247 eat_imms = eat_immediates(addr, node, force);
248 if(eat_imms != node) {
251 #ifndef AGGRESSIVE_AM
252 if(get_irn_n_edges(node) > 1) {
257 if(bitset_is_set(non_address_mode_nodes, get_irn_idx(node))) {
263 /* starting point Add, Sub or Shl, FrameAddr */
265 if(eat_shl(addr, node))
267 } else if(is_immediate(addr, node, 0)) {
268 eat_immediate(addr, node, 0);
270 } else if(be_is_FrameAddr(node)) {
271 assert(addr->base == NULL);
272 assert(addr->frame_entity == NULL);
273 addr->base = be_get_FrameAddr_frame(node);
275 addr->frame_entity = be_get_FrameAddr_entity(node);
277 } else if(is_Add(node)) {
278 ir_node *left = get_Add_left(node);
279 ir_node *right = get_Add_right(node);
280 assert(force || !is_immediate(addr, left, 0));
281 assert(force || !is_immediate(addr, right, 0));
283 if(is_Shl(left) && eat_shl(addr, left)) {
285 } else if(is_Shl(right) && eat_shl(addr, right)) {
288 if(left != NULL && be_is_FrameAddr(left)
289 && !bitset_is_set(non_address_mode_nodes, get_irn_idx(left))) {
290 assert(addr->base == NULL);
291 assert(addr->frame_entity == NULL);
292 addr->base = be_get_FrameAddr_frame(left);
294 addr->frame_entity = be_get_FrameAddr_entity(left);
296 } else if(right != NULL && be_is_FrameAddr(right)
297 && !bitset_is_set(non_address_mode_nodes, get_irn_idx(right))) {
298 assert(addr->base == NULL);
299 assert(addr->frame_entity == NULL);
300 addr->base = be_get_FrameAddr_frame(right);
302 addr->frame_entity = be_get_FrameAddr_entity(right);
307 if(addr->base != NULL) {
308 assert(addr->index == NULL && addr->scale == 0);
309 assert(right == NULL);
316 if(addr->base == NULL) {
319 assert(addr->index == NULL && addr->scale == 0);
331 static void mark_non_address_nodes(ir_node *node, void *env)
341 switch(get_irn_opcode(node)) {
343 ptr = get_Load_ptr(node);
344 mem = get_Load_mem(node);
346 bitset_set(non_address_mode_nodes, get_irn_idx(mem));
350 val = get_Store_value(node);
351 ptr = get_Store_ptr(node);
352 mem = get_Store_mem(node);
354 bitset_set(non_address_mode_nodes, get_irn_idx(val));
355 bitset_set(non_address_mode_nodes, get_irn_idx(mem));
359 left = get_Add_left(node);
360 right = get_Add_right(node);
361 /* if we can do source address mode then we will never fold the add
362 * into address mode */
363 if(is_immediate_simple(right) ||
364 (!use_source_address_mode(get_nodes_block(node), left, right)
365 && !use_source_address_mode(get_nodes_block(node), right, left))) {
368 bitset_set(non_address_mode_nodes, get_irn_idx(node));
372 arity = get_irn_arity(node);
374 for(i = 0; i < arity; ++i) {
375 ir_node *in = get_irn_n(node, i);
376 bitset_set(non_address_mode_nodes, get_irn_idx(in));
382 void calculate_non_address_mode_nodes(ir_graph *irg)
384 non_address_mode_nodes = bitset_malloc(get_irg_last_idx(irg));
386 irg_walk_graph(irg, NULL, mark_non_address_nodes, NULL);
389 void free_non_address_mode_nodes(void)
391 bitset_free(non_address_mode_nodes);