optimize.c

Revision 133, 115.4 kB (checked in by zoeloelip, 3 years ago)
Fixed optimizer bug with php 5.0.5
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`

Line
1	/*
2	+----------------------------------------------------------------------+
3	\| eAccelerator project \|
4	+----------------------------------------------------------------------+
5	\| Copyright (c) 2004 eAccelerator \|
6	\| http://eaccelerator.sourceforge.net \|
7	+----------------------------------------------------------------------+
8	\| This program is free software; you can redistribute it and/or \|
9	\| modify it under the terms of the GNU General Public License \|
10	\| as published by the Free Software Foundation; either version 2 \|
11	\| of the License, or (at your option) any later version. \|
12	\| \|
13	\| This program is distributed in the hope that it will be useful, \|
14	\| but WITHOUT ANY WARRANTY; without even the implied warranty of \|
15	\| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the \|
16	\| GNU General Public License for more details. \|
17	\| \|
18	\| You should have received a copy of the GNU General Public License \|
19	\| along with this program; if not, write to the Free Software \|
20	\| Foundation, Inc., 59 Temple Place - Suite 330, Boston, \|
21	\| MA 02111-1307, USA. \|
22	\| \|
23	\| A copy is availble at http://www.gnu.org/copyleft/gpl.txt \|
24	+----------------------------------------------------------------------+
25	\| Author(s): Dmitry Stogov <dstogov@users.sourceforge.net> \|
26	+----------------------------------------------------------------------+
27	$Id$
28	*/
29
30	#include "eaccelerator.h"
31
32	#ifdef HAVE_EACCELERATOR
33	#ifdef WITH_EACCELERATOR_OPTIMIZER
34
35	#include "zend.h"
36	#include "zend_API.h"
37	#include "zend_constants.h"
38	#include "opcodes.h"
39
40	typedef unsigned int* set;
41
42	struct _BBlink;
43
44	typedef struct _BB {
45	zend_op* start;
46	int len;
47	int used;
48	/*
49	* HOESH: To protect merging. Primary
50	* it abblies to try & catch blocks.
51	* ZEND_ENGINE_2 specific, but can take place
52	*/
53	int protect_merge;
54	struct _BB* jmp_1;
55	struct _BB* jmp_2;
56	struct _BB* jmp_ext;
57	struct _BB* follow;
58	struct _BBlink* pred; // Gonna be a chain of BBs
59	struct _BB* next;
60	} BB;
61
62	typedef struct _BBlink {
63	struct _BB* bb;
64	struct _BBlink* next;
65	} BBlink;
66
67	#if 0
68	static void dump_bb(BB* bb, zend_op_array *op_array) {
69	BB* p = bb;
70	BBlink *q;
71	zend_printf("<pre>%s:%s\n", op_array->filename, op_array->function_name);
72	while (p != NULL) {
73	zend_printf(" bb%u start=%u len=%d used=%d\n",
74	(unsigned int)(p-bb),
75	(unsigned int)(p->start-op_array->opcodes),
76	p->len,
77	p->used);
78	if (p->jmp_1) {
79	zend_printf(" jmp_1 bb%u start=%u len=%d used=%d\n",
80	(unsigned int)(p->jmp_1-bb),
81	(unsigned int)(p->jmp_1->start-op_array->opcodes),
82	p->jmp_1->len,
83	p->jmp_1->used);
84	}
85	if (p->jmp_2) {
86	zend_printf(" jmp_2 bb%u start=%u len=%d used=%d\n",
87	(unsigned int)(p->jmp_2-bb),
88	(unsigned int)(p->jmp_2->start-op_array->opcodes),
89	p->jmp_2->len,
90	p->jmp_2->used);
91	}
92	if (p->jmp_ext) {
93	zend_printf(" jmp_ext bb%u start=%u len=%d used=%d\n",
94	(unsigned int)(p->jmp_ext-bb),
95	(unsigned int)(p->jmp_ext->start-op_array->opcodes),
96	p->jmp_ext->len,
97	p->jmp_ext->used);
98	}
99	if (p->follow) {
100	zend_printf(" follow bb%u start=%u len=%d used=%d\n",
101	(unsigned int)(p->follow-bb),
102	(unsigned int)(p->follow->start-op_array->opcodes),
103	p->follow->len,
104	p->follow->used);
105	}
106	q = p->pred;
107	while (q != NULL) {
108	zend_printf(" pred bb%u start=%u len=%d used=%d (",
109	(unsigned int)(q->bb-bb),
110	(unsigned int)(q->bb->start-op_array->opcodes),
111	q->bb->len,
112	q->bb->used);
113	if (q->bb->jmp_1 == p) {
114	zend_printf("jmp_1 ");
115	}
116	if (q->bb->jmp_2 == p) {
117	zend_printf("jmp_2 ");
118	}
119	if (q->bb->jmp_ext == p) {
120	zend_printf("jmp_ext ");
121	}
122	if (q->bb->follow == p) {
123	zend_printf("follow ");
124	}
125	zend_printf(")\n");
126	q = q->next;
127	}
128	p = p->next;
129	}
130	zend_printf("</pre><hr>\n");
131	fflush(stdout);
132	}
133	#endif
134
135	#define SET_TO_NOP(op) \
136	(op)->opcode = ZEND_NOP; \
137	(op)->op1.op_type = IS_UNUSED; \
138	(op)->op2.op_type = IS_UNUSED; \
139	(op)->result.op_type = IS_UNUSED;
140
141	static void compute_live_var(BB* bb, zend_op_array* op_array, char* global)
142	{
143	BB* p = bb;
144	memset(global, 0, op_array->T * sizeof(char));
145	if (p != NULL && p->next != NULL) {
146	int bb_count = 0;
147	char def = do_alloca(op_array->T sizeof(char));
148	#if 0
149	zend_printf("<hr>%s::%s<br>", op_array->filename, op_array->function_name);
150	#endif
151	while (p != NULL) {
152	zend_op* op = p->start;
153	zend_op* end = op + p->len;
154	memset(def, 0, op_array->T * sizeof(char));
155	while (op < end) {
156	if ((op->op1.op_type == IS_VAR \|\| op->op1.op_type == IS_TMP_VAR) &&
157	!def[VAR_NUM(op->op1.u.var)] && !global[VAR_NUM(op->op1.u.var)]) {
158	global[VAR_NUM(op->op1.u.var)] = 1;
159	}
160	if ((op->op2.op_type == IS_VAR \|\| op->op2.op_type == IS_TMP_VAR) &&
161	!def[VAR_NUM(op->op2.u.var)] && !global[VAR_NUM(op->op2.u.var)]) {
162	#ifdef ZEND_ENGINE_2
163	if (op->opcode != ZEND_OP_DATA) {
164	global[VAR_NUM(op->op2.u.var)] = 1;
165	}
166	#else
167	global[VAR_NUM(op->op2.u.var)] = 1;
168	#endif
169	}
170	#ifdef ZEND_ENGINE_2
171	if (op->opcode == ZEND_DECLARE_INHERITED_CLASS &&
172	!def[VAR_NUM(op->extended_value)] &&
173	!global[VAR_NUM(op->extended_value)]) {
174	global[VAR_NUM(op->extended_value)] = 1;
175	}
176	#endif
177	if ((op->result.op_type == IS_VAR &&
178	#ifdef ZEND_ENGINE_2
179	(op->opcode == ZEND_RECV \|\| op->opcode == ZEND_RECV_INIT \|\|
180	(op->result.u.EA.type & EXT_TYPE_UNUSED) == 0)) \|\|
181	#else
182	(op->result.u.EA.type & EXT_TYPE_UNUSED) == 0) \|\|
183	#endif
184	(op->result.op_type == IS_TMP_VAR)) {
185	if (!def[VAR_NUM(op->result.u.var)] && !global[VAR_NUM(op->result.u.var)]) {
186	switch (op->opcode) {
187	case ZEND_RECV:
188	case ZEND_RECV_INIT:
189	case ZEND_ADD_ARRAY_ELEMENT:
190	global[VAR_NUM(op->result.u.var)] = 1;
191	}
192	}
193	def[VAR_NUM(op->result.u.var)] = 1;
194	}
195	op++;
196	}
197	p = p->next;
198	bb_count++;
199	}
200	free_alloca(def);
201	}
202	{
203	char used = do_alloca(op_array->T sizeof(char));
204	p = bb;
205	while (p != NULL) {
206	zend_op* op = p->start;
207	zend_op* end = op + p->len;
208	memset(used, 0, op_array->T * sizeof(char));
209	while (op < end) {
210	end--;
211	if (((end->result.op_type == IS_VAR &&
212	#ifdef ZEND_ENGINE_2
213	(end->opcode == ZEND_RECV \|\| end->opcode == ZEND_RECV_INIT \|\|
214	(end->result.u.EA.type & EXT_TYPE_UNUSED) == 0)) \|\|
215	#else
216	(end->result.u.EA.type & EXT_TYPE_UNUSED) == 0) \|\|
217	#endif
218	(end->result.op_type == IS_TMP_VAR)) &&
219	!global[VAR_NUM(end->result.u.var)] && !used[VAR_NUM(end->result.u.var)]) {
220	switch(end->opcode) {
221	case ZEND_JMPZ_EX:
222	end->opcode = ZEND_JMPZ;
223	end->result.op_type = IS_UNUSED;
224	break;
225	case ZEND_JMPNZ_EX:
226	end->opcode = ZEND_JMPNZ;
227	end->result.op_type = IS_UNUSED;
228	break;
229	case ZEND_ASSIGN_ADD:
230	case ZEND_ASSIGN_SUB:
231	case ZEND_ASSIGN_MUL:
232	case ZEND_ASSIGN_DIV:
233	case ZEND_ASSIGN_MOD:
234	case ZEND_ASSIGN_SL:
235	case ZEND_ASSIGN_SR:
236	case ZEND_ASSIGN_CONCAT:
237	case ZEND_ASSIGN_BW_OR:
238	case ZEND_ASSIGN_BW_AND:
239	case ZEND_ASSIGN_BW_XOR:
240	case ZEND_PRE_INC:
241	case ZEND_PRE_DEC:
242	case ZEND_POST_INC:
243	case ZEND_POST_DEC:
244	case ZEND_ASSIGN:
245	case ZEND_ASSIGN_REF:
246	case ZEND_DO_FCALL:
247	case ZEND_DO_FCALL_BY_NAME:
248	if (end->result.op_type == IS_VAR) {
249	end->result.u.EA.type \|= EXT_TYPE_UNUSED;
250	}
251	break;
252	case ZEND_UNSET_VAR:
253	case ZEND_UNSET_DIM_OBJ:
254	end->result.op_type = IS_UNUSED;
255	break;
256	case ZEND_RECV:
257	case ZEND_RECV_INIT:
258	/case ZEND_ADD_ARRAY_ELEMENT:/
259	case ZEND_INCLUDE_OR_EVAL:
260	case ZEND_JMP_NO_CTOR:
261	case ZEND_FE_FETCH:
262	#ifdef ZEND_ENGINE_2
263	case ZEND_ASSIGN_DIM:
264	case ZEND_DECLARE_CLASS:
265	case ZEND_DECLARE_INHERITED_CLASS:
266	#endif
267	break;
268	default:
269	if (end->op1.op_type == IS_CONST) {
270	zval_dtor(&end->op1.u.constant);
271	}
272	if (end->op2.op_type == IS_CONST) {
273	zval_dtor(&end->op2.u.constant);
274	}
275	SET_TO_NOP(end);
276	}
277	} else if (end->result.op_type == IS_VAR &&
278	(end->result.u.EA.type & EXT_TYPE_UNUSED) != 0 &&
279	#ifdef ZEND_ENGINE_2
280	end->opcode != ZEND_RECV && end->opcode != ZEND_RECV_INIT &&
281	#endif
282	used[VAR_NUM(end->result.u.var)]) {
283	end->result.u.EA.type &= ~EXT_TYPE_UNUSED;
284	}
285	if ((end->result.op_type == IS_VAR &&
286	#ifdef ZEND_ENGINE_2
287	(end->opcode == ZEND_RECV \|\| end->opcode == ZEND_RECV_INIT \|\|
288	(end->result.u.EA.type & EXT_TYPE_UNUSED) == 0)) \|\|
289	#else
290	(end->result.u.EA.type & EXT_TYPE_UNUSED) == 0) \|\|
291	#endif
292	(end->result.op_type == IS_TMP_VAR)) {
293	switch (end->opcode) {
294	case ZEND_RECV:
295	case ZEND_RECV_INIT:
296	case ZEND_ADD_ARRAY_ELEMENT:
297	used[VAR_NUM(end->result.u.var)] = 1;
298	break;
299	default:
300	used[VAR_NUM(end->result.u.var)] = 0;
301	}
302	}
303	if (end->op1.op_type == IS_VAR \|\| end->op1.op_type == IS_TMP_VAR) {
304	used[VAR_NUM(end->op1.u.var)] = 1;
305	}
306	if (end->op2.op_type == IS_VAR \|\| end->op2.op_type == IS_TMP_VAR) {
307	used[VAR_NUM(end->op2.u.var)] = 1;
308	}
309	#ifdef ZEND_ENGINE_2
310	if (end->opcode == ZEND_DECLARE_INHERITED_CLASS) {
311	used[VAR_NUM(end->extended_value)] = 1;
312	}
313	#endif
314	}
315	p = p->next;
316	}
317	free_alloca(used);
318	}
319	/*
320	while (1) {
321	int change = 0;
322	p = bb;
323	while (p != NULL) {
324	int n = SET_SIZE(op_array->T);
325	while (n-- > 0) {
326	unsigned int old_in = p->in[n];
327	p->out[n] = 0;
328	if (p->jmp_1 != NULL) p->out[n] \|= p->jmp_1->in[n];
329	if (p->jmp_2 != NULL) p->out[n] \|= p->jmp_2->in[n];
330	if (p->jmp_ext != NULL) p->out[n] \|= p->jmp_ext->in[n];
331	if (p->follow != NULL) p->out[n] \|= p->follow->in[n];
332	p->in[n] = p->use[n] \| (p->out[n] & ~p->def[n]);
333	if (old_in != p->in[n]) change = 1;
334	}
335	p = p->next;
336	}
337	if (!change) break;
338	}
339	*/
340	}
341
342	/* Adds FROM as predcessor of TO */
343	#define BB_ADD_PRED(TO,FROM) { \
344	BBlink *q = (TO)->pred; \
345	while (q != NULL) { \
346	if (q->bb == (FROM)) break; \
347	q = q->next; \
348	} \
349	if (q == NULL) { \
350	q = emalloc(sizeof(*q)); \
351	q->bb = (FROM); \
352	q->next = (TO)->pred; \
353	(TO)->pred = q; \
354	} \
355	}
356
357	/* Removes FROM from predcessors of TO */
358	#define BB_DEL_PRED(TO,FROM) { \
359	BBlink *q = (TO)->pred; \
360	if (q != NULL) { \
361	if (q->bb == (FROM)) { \
362	(TO)->pred = q->next; \
363	efree(q); \
364	} else { \
365	while (q->next != NULL) { \
366	if (q->next->bb == (FROM)) { \
367	BBlink *r = q->next; \
368	q->next = q->next->next; \
369	efree(r); \
370	break; \
371	} \
372	q = q->next; \
373	} \
374	} \
375	} \
376	}
377
378	#define RM_BB(p) do {if (p->pred == NULL && p != bb) rm_bb(p);} while (0)
379
380	static void mark_used_bb(BB* bb)
381	{
382	if (bb->used) return;
383	bb->used = 1;
384	if (bb->jmp_1 != NULL) {
385	mark_used_bb(bb->jmp_1);
386	BB_ADD_PRED(bb->jmp_1, bb);
387	}
388	if (bb->jmp_2 != NULL) {
389	mark_used_bb(bb->jmp_2);
390	BB_ADD_PRED(bb->jmp_2, bb);
391	}
392	if (bb->jmp_ext != NULL) {
393	mark_used_bb(bb->jmp_ext);
394	BB_ADD_PRED(bb->jmp_ext, bb);
395	}
396	if (bb->follow != NULL) {
397	mark_used_bb(bb->follow);
398	BB_ADD_PRED(bb->follow, bb);
399	}
400	}
401
402	static void mark_used_bb2(BB* bb)
403	{
404	if (bb->used) return;
405	bb->used = 1;
406	if (bb->jmp_1 != NULL) {
407	mark_used_bb2(bb->jmp_1);
408	}
409	if (bb->jmp_2 != NULL) {
410	mark_used_bb2(bb->jmp_2);
411	}
412	if (bb->jmp_ext != NULL) {
413	mark_used_bb2(bb->jmp_ext);
414	}
415	if (bb->follow != NULL) {
416	mark_used_bb2(bb->follow);
417	}
418	}
419
420	static void rm_bb(BB* bb)
421	{
422	if (bb->used == 0) {
423	return;
424	}
425	bb->used = 0;
426	if (bb->jmp_1 != NULL) {
427	BB_DEL_PRED(bb->jmp_1, bb);
428	}
429	if (bb->jmp_2 != NULL) {
430	BB_DEL_PRED(bb->jmp_2, bb);
431	}
432	if (bb->jmp_ext != NULL) {
433	BB_DEL_PRED(bb->jmp_ext, bb);
434	}
435	if (bb->follow != NULL) {
436	BB_DEL_PRED(bb->follow, bb);
437	}
438	}
439
440	static void del_bb(BB* bb)
441	{
442	zend_op* op = bb->start;
443	zend_op* end = op + bb->len;
444
445	rm_bb(bb);
446	while (op < end) {
447	--end;
448	if (end->op1.op_type == IS_CONST) {
449	zval_dtor(&end->op1.u.constant);
450	}
451	if (end->op2.op_type == IS_CONST) {
452	zval_dtor(&end->op2.u.constant);
453	}
454	SET_TO_NOP(end);
455	}
456	bb->len = 0;
457	bb->used = 0;
458	}
459
460	static void replace_bb(BB* src, BB* dst)
461	{
462	BBlink* p = src->pred;
463	while (p != NULL) {
464	BBlink* q = p->next;
465	if (p->bb->jmp_1 == src) {
466	p->bb->jmp_1 = dst;
467	BB_ADD_PRED(dst,p->bb);
468	}
469	if (p->bb->jmp_2 == src) {
470	p->bb->jmp_2 = dst;
471	BB_ADD_PRED(dst,p->bb);
472	}
473	if (p->bb->jmp_ext == src) {
474	p->bb->jmp_ext = dst;
475	BB_ADD_PRED(dst,p->bb);
476	}
477	if (p->bb->follow == src) {
478	p->bb->follow = dst;
479	BB_ADD_PRED(dst,p->bb);
480	}
481	efree(p);
482	p = q;
483	}
484	src->pred = NULL;
485	}
486
487	static void optimize_jmp(BB* bb, zend_op_array* op_array)
488	{
489	BB* p;
490
491	while(1) {
492	int ok = 1;
493
494	/* Remove Unused Basic Blocks */
495	p = bb;
496	while (p->next != NULL) {
497	if (p->next->used && p->next->pred) {
498	p = p->next;
499	} else {
500	del_bb(p->next);
501	p->next = p->next->next;
502	ok = 0;
503	}
504	}
505
506	/* Clear leading NOP(s) */
507	p = bb;
508	while (p != NULL) {
509	if (p->used) {
510	while (p->len > 0 && p->start->opcode ==ZEND_NOP) {
511	p->start++;
512	p->len--;
513	}
514	if (p->len == 0 && p != bb) {
515	if (p->follow) {
516	replace_bb(p, p->follow);
517	}
518	rm_bb(p);
519	p->used = 0;
520	ok = 0;
521	}
522	}
523	p = p->next;
524	}
525
526	/* JMP optimization */
527	p = bb;
528	while (p != NULL) {
529	while (p->next != NULL && (!p->next->used \|\| p->next->pred == NULL)) {
530	del_bb(p->next);
531	p->next = p->next->next;
532	ok = 0;
533	}
534	if (p->used && p->len > 0) {
535	zend_op* op = &p->start[p->len-1];
536
537	switch (op->opcode) {
538	case ZEND_JMP:
539	jmp:
540	/* L1: JMP L1+1 => NOP
541	*/
542	if (p->jmp_1 == p->next) {
543	p->follow = p->jmp_1;
544	p->jmp_1 = NULL;
545	SET_TO_NOP(op);
546	--(p->len);
547	ok = 0;
548	break;
549	}
550	/* JMP L1 => JMP L2
551	... ...
552	L1: JMP L2 JMP L2
553	*/
554	while (p->jmp_1->len == 1 &&
555	p->jmp_1->start->opcode == ZEND_JMP &&
556	p->jmp_1 != p) {
557	BB* x_p = p->jmp_1;
558	BB_DEL_PRED(p->jmp_1, p);
559	RM_BB(x_p);
560	p->jmp_1 = x_p->jmp_1;
561	BB_ADD_PRED(p->jmp_1, p);
562	ok = 0;
563	}
564	break;
565	case ZEND_JMPZNZ:
566	jmp_znz:
567	/* JMPZNZ ?,L1,L1 => JMP L1
568	*/
569	if (p->jmp_ext == p->jmp_2) {
570	op->opcode = ZEND_JMP;
571	op->extended_value = 0;
572	op->op1.op_type = IS_UNUSED;
573	op->op2.op_type = IS_UNUSED;
574	p->jmp_1 = p->jmp_2;
575	p->jmp_2 = NULL;
576	p->jmp_ext = NULL;
577	ok = 0;
578	goto jmp;
579	} else if (op->op1.op_type == IS_CONST) {
580	/* JMPZNZ 0,L1,L2 => JMP L1
581	*/
582	if (!zend_is_true(&op->op1.u.constant)) {
583	op->opcode = ZEND_JMP;
584	op->extended_value = 0;
585	op->op1.op_type = IS_UNUSED;
586	op->op2.op_type = IS_UNUSED;
587	if (p->jmp_ext != p->jmp_2) {
588	BB_DEL_PRED(p->jmp_ext, p);
589	RM_BB(p->jmp_ext);
590	}
591	p->jmp_1 = p->jmp_2;
592	p->jmp_2 = NULL;
593	p->jmp_ext = NULL;
594	p->follow = NULL;
595	ok = 0;
596	goto jmp;
597	/* JMPZNZ 1,L1,L2 => JMP L2
598	*/
599	} else {
600	op->opcode = ZEND_JMP;
601	op->extended_value = 0;
602	op->op1.op_type = IS_UNUSED;
603	op->op2.op_type = IS_UNUSED;
604	if (p->jmp_ext != p->jmp_2) {
605	BB_DEL_PRED(p->jmp_2, p);
606	RM_BB(p->jmp_2);
607	}
608	p->jmp_1 = p->jmp_ext;
609	p->jmp_2 = NULL;
610	p->jmp_ext = NULL;
611	p->follow = NULL;
612	ok = 0;
613	goto jmp;
614	}
615	/* L1: JMPZNZ ?,L2,L1+1 => JMPZ ?,L2
616	*/
617	} else if (p->jmp_ext == p->next) {
618	op->opcode = ZEND_JMPZ;
619	op->extended_value = 0;
620	p->follow = p->jmp_ext;
621	p->jmp_ext = NULL;
622	ok = 0;
623	goto jmp_z;
624	/* L1: JMPZNZ ?,L1+1,L2 => JMPNZ ?,L2
625	*/
626	} else if (p->jmp_2 == p->next) {
627	op->opcode = ZEND_JMPNZ;
628	op->extended_value = 0;
629	p->follow = p->jmp_2;
630	p->jmp_2 = p->jmp_ext;
631	p->jmp_ext = NULL;
632	ok = 0;
633	goto jmp_nz;
634	} else if (p->jmp_2->len == 1 &&
635	op->op1.op_type == IS_TMP_VAR) {
636	/* JMPZNZ $x,L1,L2 => JMPZNZ $x,L3,L2
637	... ...
638	L1: JMPZ $x,L3 JMPZ $x,L3
639	*/
640	/* JMPZNZ $x,L1,L2 => JMPZNZ $x,L3,L2
641	... ...
642	L1: JMPZNZ $x,L3,L4 JMPZNZ $x,L3,L4
643	*/
644	if ((p->jmp_2->start->opcode == ZEND_JMPZ \|\|
645	p->jmp_2->start->opcode == ZEND_JMPZNZ) &&
646	p->jmp_2->start->op1.op_type == IS_TMP_VAR &&
647	op->op1.u.var == p->jmp_2->start->op1.u.var) {
648	if (p->jmp_2 != p->jmp_ext) {
649	BB_DEL_PRED(p->jmp_2, p);
650	RM_BB(p->jmp_2);
651	}
652	p->jmp_2 = p->jmp_2->jmp_2;
653	BB_ADD_PRED(p->jmp_2, p);
654	ok = 0;
655	goto jmp_znz;
656	/* JMPZNZ $x,L1,L2 => JMPZNZ $x,L1+1,L2
657	... ...
658	L1: JMPNZ $x,L3 JMPNZ $x,L3
659	*/
660	} else if (p->jmp_2->start->opcode == ZEND_JMPNZ &&
661	p->jmp_2->start->op1.op_type == IS_TMP_VAR &&
662	op->op1.u.var == p->jmp_2->start->op1.u.var) {
663	if (p->jmp_2 != p->jmp_ext) {
664	BB_DEL_PRED(p->jmp_2, p);
665	RM_BB(p->jmp_2);
666	}
667	p->jmp_2 = p->jmp_2->follow;
668	BB_ADD_PRED(p->jmp_2, p);
669	ok = 0;
670	goto jmp_znz;
671	/* JMPZNZ $x,L1,L2 => JMPZNZ $x,L1,L3
672	... ...
673	L2: JMPNZ $x,L3 JMPNZ $x,L3
674	*/
675	} else if (p->jmp_ext->start->opcode == ZEND_JMPNZ &&
676	p->jmp_ext->start->op1.op_type == IS_TMP_VAR &&
677	op->op1.u.var == p->jmp_ext->start->op1.u.var) {
678	if (p->jmp_2 != p->jmp_ext) {
679	BB_DEL_PRED(p->jmp_ext, p);
680	RM_BB(p->jmp_ext);
681	}
682	p->jmp_ext = p->jmp_ext->jmp_2;
683	BB_ADD_PRED(p->jmp_ext, p);
684	ok = 0;
685	goto jmp_znz;
686	/* JMPZNZ $x,L1,L2 => JMPZNZ $x,L1,L4
687	... ...
688	L2: JMPZNZ $x,L3,L4 JMPZNZ $x,L3,L4
689	*/
690	} else if (p->jmp_ext->start->opcode == ZEND_JMPZNZ &&
691	p->jmp_ext->start->op1.op_type == IS_TMP_VAR &&
692	op->op1.u.var == p->jmp_ext->start->op1.u.var) {
693	if (p->jmp_2 != p->jmp_ext) {
694	BB_DEL_PRED(p->jmp_ext, p);
695	RM_BB(p->jmp_ext);
696	}
697	p->jmp_ext = p->jmp_ext->jmp_ext;
698	BB_ADD_PRED(p->jmp_ext, p);
699	ok = 0;
700	goto jmp_znz;
701	/* JMPZNZ $x,L1,L2 => JMPZNZ $x,L1,L2+1
702	... ...
703	L2: JMPZ $x,L3 JMPZ $x,L3
704	*/
705	} else if (p->jmp_ext->start->opcode == ZEND_JMPZ &&
706	p->jmp_ext->start->op1.op_type == IS_TMP_VAR &&
707	op->op1.u.var == p->jmp_ext->start->op1.u.var) {
708	if (p->jmp_2 != p->jmp_ext) {
709	BB_DEL_PRED(p->jmp_ext, p);
710	RM_BB(p->jmp_ext);
711	}
712	p->jmp_ext = p->jmp_ext->follow;
713	BB_ADD_PRED(p->jmp_ext, p);
714	ok = 0;
715	goto jmp_znz;
716	}
717	}
718	while (p->jmp_2->len == 1 && p->jmp_2->start->opcode == ZEND_JMP) {
719	BB* x_p = p->jmp_2;
720	if (p->jmp_2 != p->jmp_ext) {
721	BB_DEL_PRED(p->jmp_2, p);
722	RM_BB(x_p);
723	}
724	p->jmp_2 = x_p->jmp_1;
725	BB_ADD_PRED(p->jmp_2, p);
726	ok = 0;
727	}
728	while (p->jmp_ext->len == 1 && p->jmp_ext->start->opcode == ZEND_JMP) {
729	BB* x_p = p->jmp_ext;
730	if (p->jmp_2 != p->jmp_ext) {
731	BB_DEL_PRED(p->jmp_ext, p);
732	RM_BB(x_p);
733	}
734	p->jmp_ext = x_p->jmp_1;
735	BB_ADD_PRED(p->jmp_ext, p);
736	ok = 0;
737	}
738	break;
739	case ZEND_JMPZ:
740	jmp_z:
741	/* L1: JMPZ ?,L1+1 => NOP
742	*/
743	if (p->follow == p->jmp_2) {
744	p->jmp_2 = NULL;
745	SET_TO_NOP(op);
746	--(p->len);
747	ok = 0;
748	break;
749	} else if (op->op1.op_type == IS_CONST) {
750	/* JMPZ 0,L1 => JMP L1
751	*/
752	if (!zend_is_true(&op->op1.u.constant)) {
753	op->opcode = ZEND_JMP;
754	op->op1.op_type = IS_UNUSED;
755	op->op2.op_type = IS_UNUSED;
756	if (p->follow != p->jmp_2) {
757	BB_DEL_PRED(p->follow, p);
758	RM_BB(p->follow);
759	}
760	p->jmp_1 = p->jmp_2;
761	p->jmp_2 = NULL;
762	p->follow = NULL;
763	ok = 0;
764	goto jmp;
765	/* JMPZ 1,L1 => NOP
766	*/
767	} else {
768	if (p->follow != p->jmp_2) {
769	BB_DEL_PRED(p->jmp_2, p);
770	RM_BB(p->jmp_2);
771	}
772	p->jmp_2 = NULL;
773	SET_TO_NOP(op);
774	--(p->len);
775	ok = 0;
776	break;
777	}
778	/* JMPZ ?,L1 => JMPZNZ ?,L1,L2
779	JMP L2 JMP L2
780	*/
781	} else if (p->follow->len == 1 && p->follow->start->opcode == ZEND_JMP) {
782	BB* x_p = p->follow;
783	op->opcode = ZEND_JMPZNZ;
784	if (p->jmp_2 != p->follow) {
785	BB_DEL_PRED(p->follow, p);
786	RM_BB(x_p);
787	}
788	p->follow = NULL;
789	p->jmp_ext = x_p->jmp_1;
790	BB_ADD_PRED(p->jmp_ext, p);
791	ok = 0;
792	goto jmp_znz;
793	} else if (p->jmp_2->len == 1 &&
794	op->op1.op_type == IS_TMP_VAR) {
795	/* JMPZ $x,L1 => JMPZ $x,L2
796	... ...
797	L1: JMPZ $x,L2 JMPZ $x,L2
798	----------------------------------------
799	JMPZ $x,L1 => JMPZ $x,L2
800	... ...
801	L1: JMPZNZ $x,L2,L3 JMPZNZ $x,L2,L3
802	*/
803	if ((p->jmp_2->start->opcode == ZEND_JMPZ \|\|
804	p->jmp_2->start->opcode == ZEND_JMPZNZ) &&
805	p->jmp_2->start->op1.op_type == IS_TMP_VAR &&
806	op->op1.u.var == p->jmp_2->start->op1.u.var) {
807	if (p->jmp_2 != p->follow) {
808	BB_DEL_PRED(p->jmp_2, p);
809	RM_BB(p->jmp_2);
810	}
811	p->jmp_2 = p->jmp_2->jmp_2;
812	BB_ADD_PRED(p->jmp_2, p);
813	ok = 0;
814	goto jmp_z;
815	/* JMPZ $x,L1 => JMPZ $x,L1+1
816	... ...
817	L1: JMPNZ $x,L2 JMPNZ $x,L2
818	*/
819	} else if (p->jmp_2->start->opcode == ZEND_JMPNZ &&
820	p->jmp_2->start->op1.op_type == IS_TMP_VAR &&
821	op->op1.u.var == p->jmp_2->start->op1.u.var) {
822	if (p->jmp_2 != p->follow) {
823	BB_DEL_PRED(p->jmp_2, p);
824	RM_BB(p->jmp_2);
825	}
826	p->jmp_2 = p->jmp_2->follow;
827	BB_ADD_PRED(p->jmp_2, p);
828	ok = 0;
829	goto jmp_z;
830	}
831	}
832	goto jmp_2;
833	case ZEND_JMPNZ:
834	jmp_nz:
835	/* L1: JMPNZ ?,L1+1 => NOP
836	*/
837	if (p->follow == p->jmp_2) {
838	p->jmp_2 = NULL;
839	SET_TO_NOP(op);
840	--(p->len);
841	ok = 0;
842	break;
843	} else if (op->op1.op_type == IS_CONST) {
844	/* JMPNZ 1,L1 => JMP L1
845	*/
846	if (zend_is_true(&op->op1.u.constant)) {
847	op->opcode = ZEND_JMP;
848	op->op1.op_type = IS_UNUSED;
849	op->op2.op_type = IS_UNUSED;
850	if (p->follow != p->jmp_2) {
851	BB_DEL_PRED(p->follow, p);
852	RM_BB(p->follow);
853	}
854	p->jmp_1 = p->jmp_2;
855	p->jmp_2 = NULL;
856	p->follow = NULL;
857	ok = 0;
858	goto jmp;
859	/* JMPNZ 0,L1 => NOP
860	*/
861	} else {
862	if (p->follow != p->jmp_2) {
863	BB_DEL_PRED(p->jmp_2, p);
864	RM_BB(p->jmp_2);
865	}
866	p->jmp_2 = NULL;
867	SET_TO_NOP(op);
868	--(p->len);
869	ok = 0;
870	break;
871	}
872	/* JMPNZ ?,L1 => JMPZNZ ?,L2,L1
873	JMP L2 JMP L2
874	*/
875	} else if (p->follow->len == 1 && p->follow->start->opcode == ZEND_JMP) {
876	BB* x_p = p->follow;
877	op->opcode = ZEND_JMPZNZ;
878	if (p->jmp_2 != p->follow) {
879	BB_DEL_PRED(p->follow, p);
880	RM_BB(p->follow);
881	}
882	p->follow = NULL;
883	p->jmp_ext = p->jmp_2;
884	p->jmp_2 = x_p->jmp_1;
885	BB_ADD_PRED(p->jmp_2, p);
886	ok = 0;
887	goto jmp_znz;
888	/* JMPNZ $x,L1 => JMPNZ $x,L2
889	... ...
890	L1: JMPNZ $x,L2 JMPNZ $x,L2
891	*/
892	} else if (p->jmp_2->len == 1 &&
893	op->op1.op_type == IS_TMP_VAR) {
894	if (p->jmp_2->start->opcode == ZEND_JMPNZ &&
895	p->jmp_2->start->op1.op_type == IS_TMP_VAR &&
896	op->op1.u.var == p->jmp_2->start->op1.u.var) {
897	if (p->jmp_2 != p->follow) {
898	BB_DEL_PRED(p->jmp_2, p);
899	RM_BB(p->jmp_2);
900	}
901	p->jmp_2 = p->jmp_2->jmp_2;
902	BB_ADD_PRED(p->jmp_2, p);
903	ok = 0;
904	goto jmp_nz;
905	/* JMPNZ $x,L1 => JMPNZ $x,L1+1
906	... ...
907	L1: JMPZ $x,L2 JMPZ $x,L2
908	*/
909	} else if (p->jmp_2->start->opcode == ZEND_JMPZ &&
910	p->jmp_2->start->op1.op_type == IS_TMP_VAR &&
911	op->op1.u.var == p->jmp_2->start->op1.u.var) {
912	if (p->jmp_2 != p->follow) {
913	BB_DEL_PRED(p->jmp_2, p);
914	RM_BB(p->jmp_2);
915	}
916	p->jmp_2 = p->jmp_2->follow;
917	BB_ADD_PRED(p->jmp_2, p);
918	ok = 0;
919	goto jmp_nz;
920	/* JMPNZ $x,L1 => JMPNZ $x,L3
921	... ...
922	L1: JMPZNZ $x,L2,L3 JMPZNZ $x,L2,L3
923	*/
924	} else if (p->jmp_2->start->opcode == ZEND_JMPZNZ &&
925	p->jmp_2->start->op1.op_type == IS_TMP_VAR &&
926	op->op1.u.var == p->jmp_2->start->op1.u.var) {
927	if (p->jmp_2 != p->follow) {
928	BB_DEL_PRED(p->jmp_2, p);
929	RM_BB(p->jmp_2);
930	}
931	p->jmp_2 = p->jmp_2->jmp_ext;
932	BB_ADD_PRED(p->jmp_2, p);
933	ok = 0;
934	goto jmp_nz;
935	}
936	}
937	goto jmp_2;
938	case ZEND_JMPZ_EX:
939	jmp_z_ex:
940	/* L1: JMPZ_EX $x,L1+1,$x => NOP
941	*/
942	if (p->follow == p->jmp_2 &&
943	op->op1.op_type == IS_TMP_VAR &&
944	op->result.op_type == IS_TMP_VAR &&
945	op->op1.u.var == op->result.u.var) {
946	p->jmp_2 = NULL;
947	SET_TO_NOP(op);
948	--(p->len);
949	ok = 0;
950	break;
951	/* L1: JMPZ_EX $x,L1+1,$y => BOOL $x,$y
952	*/
953	} else if (p->follow == p->jmp_2) {
954	p->jmp_2 = NULL;
955	op->opcode = ZEND_BOOL;
956	op->op2.op_type = IS_UNUSED;
957	ok = 0;
958	break;
959	} else if (p->jmp_2->len == 1 &&
960	op->result.op_type == IS_TMP_VAR) {
961	/* JMPZ_EX ?,L1,$x => JMPZ_EX ?,L2,$x
962	... ...
963	L1: JMPZ $x,L2 JMPZ $x,L2
964	------------------------------------------
965	JMPZ_EX ?,L1,$x => JMPZ_EX ?,L2,$x
966	... ...
967	L1: JMPZNZ $x,L2,L3 JMPZNZ $x,L2,L3
968	------------------------------------------
969	JMPZ_EX ?,L1,$x => JMPZ_EX ?,L2,$x
970	... ...
971	L1: JMPZ_EX $x,L2,$x JMPZ_EX $x,L2,$x
972	*/
973	if (((p->jmp_2->start->opcode == ZEND_JMPZ \|\|
974	p->jmp_2->start->opcode == ZEND_JMPZNZ) &&
975	p->jmp_2->start->op1.op_type == IS_TMP_VAR &&
976	op->result.u.var == p->jmp_2->start->op1.u.var) \|\|
977	(p->jmp_2->start->opcode == ZEND_JMPZ_EX &&
978	p->jmp_2->start->op1.op_type == IS_TMP_VAR &&
979