inffast.S@ 70922

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zlib 1.2.8 unmodified
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1	/*
2	* inffast.S is a hand tuned assembler version of:
3	*
4	* inffast.c -- fast decoding
5	* Copyright (C) 1995-2003 Mark Adler
6	* For conditions of distribution and use, see copyright notice in zlib.h
7	*
8	* Copyright (C) 2003 Chris Anderson <[email protected]>
9	* Please use the copyright conditions above.
10	*
11	* This version (Jan-23-2003) of inflate_fast was coded and tested under
12	* GNU/Linux on a pentium 3, using the gcc-3.2 compiler distribution. On that
13	* machine, I found that gzip style archives decompressed about 20% faster than
14	* the gcc-3.2 -O3 -fomit-frame-pointer compiled version. Your results will
15	* depend on how large of a buffer is used for z_stream.next_in & next_out
16	* (8K-32K worked best for my 256K cpu cache) and how much overhead there is in
17	* stream processing I/O and crc32/addler32. In my case, this routine used
18	* 70% of the cpu time and crc32 used 20%.
19	*
20	* I am confident that this version will work in the general case, but I have
21	* not tested a wide variety of datasets or a wide variety of platforms.
22	*
23	* Jan-24-2003 -- Added -DUSE_MMX define for slightly faster inflating.
24	* It should be a runtime flag instead of compile time flag...
25	*
26	* Jan-26-2003 -- Added runtime check for MMX support with cpuid instruction.
27	* With -DUSE_MMX, only MMX code is compiled. With -DNO_MMX, only non-MMX code
28	* is compiled. Without either option, runtime detection is enabled. Runtime
29	* detection should work on all modern cpus and the recomended algorithm (flip
30	* ID bit on eflags and then use the cpuid instruction) is used in many
31	* multimedia applications. Tested under win2k with gcc-2.95 and gas-2.12
32	* distributed with cygwin3. Compiling with gcc-2.95 -c inffast.S -o
33	* inffast.obj generates a COFF object which can then be linked with MSVC++
34	* compiled code. Tested under FreeBSD 4.7 with gcc-2.95.
35	*
36	* Jan-28-2003 -- Tested Athlon XP... MMX mode is slower than no MMX (and
37	* slower than compiler generated code). Adjusted cpuid check to use the MMX
38	* code only for Pentiums < P4 until I have more data on the P4. Speed
39	* improvment is only about 15% on the Athlon when compared with code generated
40	* with MSVC++. Not sure yet, but I think the P4 will also be slower using the
41	* MMX mode because many of it's x86 ALU instructions execute in .5 cycles and
42	* have less latency than MMX ops. Added code to buffer the last 11 bytes of
43	* the input stream since the MMX code grabs bits in chunks of 32, which
44	* differs from the inffast.c algorithm. I don't think there would have been
45	* read overruns where a page boundary was crossed (a segfault), but there
46	* could have been overruns when next_in ends on unaligned memory (unintialized
47	* memory read).
48	*
49	* Mar-13-2003 -- P4 MMX is slightly slower than P4 NO_MMX. I created a C
50	* version of the non-MMX code so that it doesn't depend on zstrm and zstate
51	* structure offsets which are hard coded in this file. This was last tested
52	* with zlib-1.2.0 which is currently in beta testing, newer versions of this
53	* and inffas86.c can be found at http://www.eetbeetee.com/zlib/ and
54	* http://www.charm.net/~christop/zlib/
55	*/
56
57
58	/*
59	* if you have underscore linking problems (_inflate_fast undefined), try
60	* using -DGAS_COFF
61	*/
62	#if ! defined( GAS_COFF ) && ! defined( GAS_ELF )
63
64	#if defined( WIN32 ) \|\| defined( __CYGWIN__ )
65	#define GAS_COFF /* windows object format */
66	#else
67	#define GAS_ELF
68	#endif
69
70	#endif /* ! GAS_COFF && ! GAS_ELF */
71
72
73	#if defined( GAS_COFF )
74
75	/* coff externals have underscores */
76	#define inflate_fast _inflate_fast
77	#define inflate_fast_use_mmx _inflate_fast_use_mmx
78
79	#endif /* GAS_COFF */
80
81
82	.file "inffast.S"
83
84	.globl inflate_fast
85
86	.text
87	.align 4,0
88	.L_invalid_literal_length_code_msg:
89	.string "invalid literal/length code"
90
91	.align 4,0
92	.L_invalid_distance_code_msg:
93	.string "invalid distance code"
94
95	.align 4,0
96	.L_invalid_distance_too_far_msg:
97	.string "invalid distance too far back"
98
99	#if ! defined( NO_MMX )
100	.align 4,0
101	.L_mask: /* mask[N] = ( 1 << N ) - 1 */
102	.long 0
103	.long 1
104	.long 3
105	.long 7
106	.long 15
107	.long 31
108	.long 63
109	.long 127
110	.long 255
111	.long 511
112	.long 1023
113	.long 2047
114	.long 4095
115	.long 8191
116	.long 16383
117	.long 32767
118	.long 65535
119	.long 131071
120	.long 262143
121	.long 524287
122	.long 1048575
123	.long 2097151
124	.long 4194303
125	.long 8388607
126	.long 16777215
127	.long 33554431
128	.long 67108863
129	.long 134217727
130	.long 268435455
131	.long 536870911
132	.long 1073741823
133	.long 2147483647
134	.long 4294967295
135	#endif /* NO_MMX */
136
137	.text
138
139	/*
140	* struct z_stream offsets, in zlib.h
141	*/
142	#define next_in_strm 0 /* strm->next_in */
143	#define avail_in_strm 4 /* strm->avail_in */
144	#define next_out_strm 12 /* strm->next_out */
145	#define avail_out_strm 16 /* strm->avail_out */
146	#define msg_strm 24 /* strm->msg */
147	#define state_strm 28 /* strm->state */
148
149	/*
150	* struct inflate_state offsets, in inflate.h
151	*/
152	#define mode_state 0 /* state->mode */
153	#define wsize_state 32 /* state->wsize */
154	#define write_state 40 /* state->write */
155	#define window_state 44 /* state->window */
156	#define hold_state 48 /* state->hold */
157	#define bits_state 52 /* state->bits */
158	#define lencode_state 68 /* state->lencode */
159	#define distcode_state 72 /* state->distcode */
160	#define lenbits_state 76 /* state->lenbits */
161	#define distbits_state 80 /* state->distbits */
162
163	/*
164	* inflate_fast's activation record
165	*/
166	#define local_var_size 64 /* how much local space for vars */
167	#define strm_sp 88 /* first arg: z_stream * (local_var_size + 24) */
168	#define start_sp 92 /* second arg: unsigned int (local_var_size + 28) */
169
170	/*
171	* offsets for local vars on stack
172	*/
173	#define out 60 /* unsigned char* */
174	#define window 56 /* unsigned char* */
175	#define wsize 52 /* unsigned int */
176	#define write 48 /* unsigned int */
177	#define in 44 /* unsigned char* */
178	#define beg 40 /* unsigned char* */
179	#define buf 28 /* char[ 12 ] */
180	#define len 24 /* unsigned int */
181	#define last 20 /* unsigned char* */
182	#define end 16 /* unsigned char* */
183	#define dcode 12 /* code* */
184	#define lcode 8 /* code* */
185	#define dmask 4 /* unsigned int */
186	#define lmask 0 /* unsigned int */
187
188	/*
189	* typedef enum inflate_mode consts, in inflate.h
190	*/
191	#define INFLATE_MODE_TYPE 11 /* state->mode flags enum-ed in inflate.h */
192	#define INFLATE_MODE_BAD 26
193
194
195	#if ! defined( USE_MMX ) && ! defined( NO_MMX )
196
197	#define RUN_TIME_MMX
198
199	#define CHECK_MMX 1
200	#define DO_USE_MMX 2
201	#define DONT_USE_MMX 3
202
203	.globl inflate_fast_use_mmx
204
205	.data
206
207	.align 4,0
208	inflate_fast_use_mmx: /* integer flag for run time control 1=check,2=mmx,3=no */
209	.long CHECK_MMX
210
211	#if defined( GAS_ELF )
212	/* elf info */
213	.type inflate_fast_use_mmx,@object
214	.size inflate_fast_use_mmx,4
215	#endif
216
217	#endif /* RUN_TIME_MMX */
218
219	#if defined( GAS_COFF )
220	/* coff info: scl 2 = extern, type 32 = function */
221	.def inflate_fast; .scl 2; .type 32; .endef
222	#endif
223
224	.text
225
226	.align 32,0x90
227	inflate_fast:
228	pushl %edi
229	pushl %esi
230	pushl %ebp
231	pushl %ebx
232	pushf /* save eflags (strm_sp, state_sp assumes this is 32 bits) */
233	subl $local_var_size, %esp
234	cld
235
236	#define strm_r %esi
237	#define state_r %edi
238
239	movl strm_sp(%esp), strm_r
240	movl state_strm(strm_r), state_r
241
242	/* in = strm->next_in;
243	* out = strm->next_out;
244	* last = in + strm->avail_in - 11;
245	* beg = out - (start - strm->avail_out);
246	* end = out + (strm->avail_out - 257);
247	*/
248	movl avail_in_strm(strm_r), %edx
249	movl next_in_strm(strm_r), %eax
250
251	addl %eax, %edx /* avail_in += next_in */
252	subl $11, %edx /* avail_in -= 11 */
253
254	movl %eax, in(%esp)
255	movl %edx, last(%esp)
256
257	movl start_sp(%esp), %ebp
258	movl avail_out_strm(strm_r), %ecx
259	movl next_out_strm(strm_r), %ebx
260
261	subl %ecx, %ebp /* start -= avail_out */
262	negl %ebp /* start = -start */
263	addl %ebx, %ebp /* start += next_out */
264
265	subl $257, %ecx /* avail_out -= 257 */
266	addl %ebx, %ecx /* avail_out += out */
267
268	movl %ebx, out(%esp)
269	movl %ebp, beg(%esp)
270	movl %ecx, end(%esp)
271
272	/* wsize = state->wsize;
273	* write = state->write;
274	* window = state->window;
275	* hold = state->hold;
276	* bits = state->bits;
277	* lcode = state->lencode;
278	* dcode = state->distcode;
279	* lmask = ( 1 << state->lenbits ) - 1;
280	* dmask = ( 1 << state->distbits ) - 1;
281	*/
282
283	movl lencode_state(state_r), %eax
284	movl distcode_state(state_r), %ecx
285
286	movl %eax, lcode(%esp)
287	movl %ecx, dcode(%esp)
288
289	movl $1, %eax
290	movl lenbits_state(state_r), %ecx
291	shll %cl, %eax
292	decl %eax
293	movl %eax, lmask(%esp)
294
295	movl $1, %eax
296	movl distbits_state(state_r), %ecx
297	shll %cl, %eax
298	decl %eax
299	movl %eax, dmask(%esp)
300
301	movl wsize_state(state_r), %eax
302	movl write_state(state_r), %ecx
303	movl window_state(state_r), %edx
304
305	movl %eax, wsize(%esp)
306	movl %ecx, write(%esp)
307	movl %edx, window(%esp)
308
309	movl hold_state(state_r), %ebp
310	movl bits_state(state_r), %ebx
311
312	#undef strm_r
313	#undef state_r
314
315	#define in_r %esi
316	#define from_r %esi
317	#define out_r %edi
318
319	movl in(%esp), in_r
320	movl last(%esp), %ecx
321	cmpl in_r, %ecx
322	ja .L_align_long /* if in < last */
323
324	addl $11, %ecx /* ecx = &in[ avail_in ] */
325	subl in_r, %ecx /* ecx = avail_in */
326	movl $12, %eax
327	subl %ecx, %eax /* eax = 12 - avail_in */
328	leal buf(%esp), %edi
329	rep movsb /* memcpy( buf, in, avail_in ) */
330	movl %eax, %ecx
331	xorl %eax, %eax
332	rep stosb /* memset( &buf[ avail_in ], 0, 12 - avail_in ) */
333	leal buf(%esp), in_r /* in = buf */
334	movl in_r, last(%esp) /* last = in, do just one iteration */
335	jmp .L_is_aligned
336
337	/* align in_r on long boundary */
338	.L_align_long:
339	testl $3, in_r
340	jz .L_is_aligned
341	xorl %eax, %eax
342	movb (in_r), %al
343	incl in_r
344	movl %ebx, %ecx
345	addl $8, %ebx
346	shll %cl, %eax
347	orl %eax, %ebp
348	jmp .L_align_long
349
350	.L_is_aligned:
351	movl out(%esp), out_r
352
353	#if defined( NO_MMX )
354	jmp .L_do_loop
355	#endif
356
357	#if defined( USE_MMX )
358	jmp .L_init_mmx
359	#endif
360
361	/* Runtime MMX check */
362
363	#if defined( RUN_TIME_MMX )
364	.L_check_mmx:
365	cmpl $DO_USE_MMX, inflate_fast_use_mmx
366	je .L_init_mmx
367	ja .L_do_loop /* > 2 */
368
369	pushl %eax
370	pushl %ebx
371	pushl %ecx
372	pushl %edx
373	pushf
374	movl (%esp), %eax /* copy eflags to eax */
375	xorl $0x200000, (%esp) /* try toggling ID bit of eflags (bit 21)
376	* to see if cpu supports cpuid...
377	* ID bit method not supported by NexGen but
378	* bios may load a cpuid instruction and
379	* cpuid may be disabled on Cyrix 5-6x86 */
380	popf
381	pushf
382	popl %edx /* copy new eflags to edx */
383	xorl %eax, %edx /* test if ID bit is flipped */
384	jz .L_dont_use_mmx /* not flipped if zero */
385	xorl %eax, %eax
386	cpuid
387	cmpl $0x756e6547, %ebx /* check for GenuineIntel in ebx,ecx,edx */
388	jne .L_dont_use_mmx
389	cmpl $0x6c65746e, %ecx
390	jne .L_dont_use_mmx
391	cmpl $0x49656e69, %edx
392	jne .L_dont_use_mmx
393	movl $1, %eax
394	cpuid /* get cpu features */
395	shrl $8, %eax
396	andl $15, %eax
397	cmpl $6, %eax /* check for Pentium family, is 0xf for P4 */
398	jne .L_dont_use_mmx
399	testl $0x800000, %edx /* test if MMX feature is set (bit 23) */
400	jnz .L_use_mmx
401	jmp .L_dont_use_mmx
402	.L_use_mmx:
403	movl $DO_USE_MMX, inflate_fast_use_mmx
404	jmp .L_check_mmx_pop
405	.L_dont_use_mmx:
406	movl $DONT_USE_MMX, inflate_fast_use_mmx
407	.L_check_mmx_pop:
408	popl %edx
409	popl %ecx
410	popl %ebx
411	popl %eax
412	jmp .L_check_mmx
413	#endif
414
415
416	/* Non-MMX code */
417
418	#if defined ( NO_MMX ) \|\| defined( RUN_TIME_MMX )
419
420	#define hold_r %ebp
421	#define bits_r %bl
422	#define bitslong_r %ebx
423
424	.align 32,0x90
425	.L_while_test:
426	/* while (in < last && out < end)
427	*/
428	cmpl out_r, end(%esp)
429	jbe .L_break_loop /* if (out >= end) */
430
431	cmpl in_r, last(%esp)
432	jbe .L_break_loop
433
434	.L_do_loop:
435	/* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out
436	*
437	* do {
438	* if (bits < 15) {
439	* hold \|= ((unsigned short )in)++ << bits;
440	* bits += 16
441	* }
442	* this = lcode[hold & lmask]
443	*/
444	cmpb $15, bits_r
445	ja .L_get_length_code /* if (15 < bits) */
446
447	xorl %eax, %eax
448	lodsw /* al = (ushort )in++ */
449	movb bits_r, %cl /* cl = bits, needs it for shifting */
450	addb $16, bits_r /* bits += 16 */
451	shll %cl, %eax
452	orl %eax, hold_r /* hold \|= ((ushort )in)++ << bits */
453
454	.L_get_length_code:
455	movl lmask(%esp), %edx /* edx = lmask */
456	movl lcode(%esp), %ecx /* ecx = lcode */
457	andl hold_r, %edx /* edx &= hold */
458	movl (%ecx,%edx,4), %eax /* eax = lcode[hold & lmask] */
459
460	.L_dolen:
461	/* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out
462	*
463	* dolen:
464	* bits -= this.bits;
465	* hold >>= this.bits
466	*/
467	movb %ah, %cl /* cl = this.bits */
468	subb %ah, bits_r /* bits -= this.bits */
469	shrl %cl, hold_r /* hold >>= this.bits */
470
471	/* check if op is a literal
472	* if (op == 0) {
473	* PUP(out) = this.val;
474	* }
475	*/
476	testb %al, %al
477	jnz .L_test_for_length_base /* if (op != 0) 45.7% */
478
479	shrl $16, %eax /* output this.val char */
480	stosb
481	jmp .L_while_test
482
483	.L_test_for_length_base:
484	/* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out, %edx = len
485	*
486	* else if (op & 16) {
487	* len = this.val
488	* op &= 15
489	* if (op) {
490	* if (op > bits) {
491	* hold \|= ((unsigned short )in)++ << bits;
492	* bits += 16
493	* }
494	* len += hold & mask[op];
495	* bits -= op;
496	* hold >>= op;
497	* }
498	*/
499	#define len_r %edx
500	movl %eax, len_r /* len = this */
501	shrl $16, len_r /* len = this.val */
502	movb %al, %cl
503
504	testb $16, %al
505	jz .L_test_for_second_level_length /* if ((op & 16) == 0) 8% */
506	andb $15, %cl /* op &= 15 */
507	jz .L_save_len /* if (!op) */
508	cmpb %cl, bits_r
509	jae .L_add_bits_to_len /* if (op <= bits) */
510
511	movb %cl, %ch /* stash op in ch, freeing cl */
512	xorl %eax, %eax
513	lodsw /* al = (ushort )in++ */
514	movb bits_r, %cl /* cl = bits, needs it for shifting */
515	addb $16, bits_r /* bits += 16 */
516	shll %cl, %eax
517	orl %eax, hold_r /* hold \|= ((ushort )in)++ << bits */
518	movb %ch, %cl /* move op back to ecx */
519
520	.L_add_bits_to_len:
521	movl $1, %eax
522	shll %cl, %eax
523	decl %eax
524	subb %cl, bits_r
525	andl hold_r, %eax /* eax &= hold */
526	shrl %cl, hold_r
527	addl %eax, len_r /* len += hold & mask[op] */
528
529	.L_save_len:
530	movl len_r, len(%esp) /* save len */
531	#undef len_r
532
533	.L_decode_distance:
534	/* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out, %edx = dist
535	*
536	* if (bits < 15) {
537	* hold \|= ((unsigned short )in)++ << bits;
538	* bits += 16
539	* }
540	* this = dcode[hold & dmask];
541	* dodist:
542	* bits -= this.bits;
543	* hold >>= this.bits;
544	* op = this.op;
545	*/
546
547	cmpb $15, bits_r
548	ja .L_get_distance_code /* if (15 < bits) */
549
550	xorl %eax, %eax
551	lodsw /* al = (ushort )in++ */
552	movb bits_r, %cl /* cl = bits, needs it for shifting */
553	addb $16, bits_r /* bits += 16 */
554	shll %cl, %eax
555	orl %eax, hold_r /* hold \|= ((ushort )in)++ << bits */
556
557	.L_get_distance_code:
558	movl dmask(%esp), %edx /* edx = dmask */
559	movl dcode(%esp), %ecx /* ecx = dcode */
560	andl hold_r, %edx /* edx &= hold */
561	movl (%ecx,%edx,4), %eax /* eax = dcode[hold & dmask] */
562
563	#define dist_r %edx
564	.L_dodist:
565	movl %eax, dist_r /* dist = this */
566	shrl $16, dist_r /* dist = this.val */
567	movb %ah, %cl
568	subb %ah, bits_r /* bits -= this.bits */
569	shrl %cl, hold_r /* hold >>= this.bits */
570
571	/* if (op & 16) {
572	* dist = this.val
573	* op &= 15
574	* if (op > bits) {
575	* hold \|= ((unsigned short )in)++ << bits;
576	* bits += 16
577	* }
578	* dist += hold & mask[op];
579	* bits -= op;
580	* hold >>= op;
581	*/
582	movb %al, %cl /* cl = this.op */
583
584	testb $16, %al /* if ((op & 16) == 0) */
585	jz .L_test_for_second_level_dist
586	andb $15, %cl /* op &= 15 */
587	jz .L_check_dist_one
588	cmpb %cl, bits_r
589	jae .L_add_bits_to_dist /* if (op <= bits) 97.6% */
590
591	movb %cl, %ch /* stash op in ch, freeing cl */
592	xorl %eax, %eax
593	lodsw /* al = (ushort )in++ */
594	movb bits_r, %cl /* cl = bits, needs it for shifting */
595	addb $16, bits_r /* bits += 16 */
596	shll %cl, %eax
597	orl %eax, hold_r /* hold \|= ((ushort )in)++ << bits */
598	movb %ch, %cl /* move op back to ecx */
599
600	.L_add_bits_to_dist:
601	movl $1, %eax
602	shll %cl, %eax
603	decl %eax /* (1 << op) - 1 */
604	subb %cl, bits_r
605	andl hold_r, %eax /* eax &= hold */
606	shrl %cl, hold_r
607	addl %eax, dist_r /* dist += hold & ((1 << op) - 1) */
608	jmp .L_check_window
609
610	.L_check_window:
611	/* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
612	* %ecx = nbytes
613	*
614	* nbytes = out - beg;
615	* if (dist <= nbytes) {
616	* from = out - dist;
617	* do {
618	* PUP(out) = PUP(from);
619	* } while (--len > 0) {
620	* }
621	*/
622
623	movl in_r, in(%esp) /* save in so from can use it's reg */
624	movl out_r, %eax
625	subl beg(%esp), %eax /* nbytes = out - beg */
626
627	cmpl dist_r, %eax
628	jb .L_clip_window /* if (dist > nbytes) 4.2% */
629
630	movl len(%esp), %ecx
631	movl out_r, from_r
632	subl dist_r, from_r /* from = out - dist */
633
634	subl $3, %ecx
635	movb (from_r), %al
636	movb %al, (out_r)
637	movb 1(from_r), %al
638	movb 2(from_r), %dl
639	addl $3, from_r
640	movb %al, 1(out_r)
641	movb %dl, 2(out_r)
642	addl $3, out_r
643	rep movsb
644
645	movl in(%esp), in_r /* move in back to %esi, toss from */
646	jmp .L_while_test
647
648	.align 16,0x90
649	.L_check_dist_one:
650	cmpl $1, dist_r
651	jne .L_check_window
652	cmpl out_r, beg(%esp)
653	je .L_check_window
654
655	decl out_r
656	movl len(%esp), %ecx
657	movb (out_r), %al
658	subl $3, %ecx
659
660	movb %al, 1(out_r)
661	movb %al, 2(out_r)
662	movb %al, 3(out_r)
663	addl $4, out_r
664	rep stosb
665
666	jmp .L_while_test
667
668	.align 16,0x90
669	.L_test_for_second_level_length:
670	/* else if ((op & 64) == 0) {
671	* this = lcode[this.val + (hold & mask[op])];
672	* }
673	*/
674	testb $64, %al
675	jnz .L_test_for_end_of_block /* if ((op & 64) != 0) */
676
677	movl $1, %eax
678	shll %cl, %eax
679	decl %eax
680	andl hold_r, %eax /* eax &= hold */
681	addl %edx, %eax /* eax += this.val */
682	movl lcode(%esp), %edx /* edx = lcode */
683	movl (%edx,%eax,4), %eax /* eax = lcode[val + (hold&mask[op])] */
684	jmp .L_dolen
685
686	.align 16,0x90
687	.L_test_for_second_level_dist:
688	/* else if ((op & 64) == 0) {
689	* this = dcode[this.val + (hold & mask[op])];
690	* }
691	*/
692	testb $64, %al
693	jnz .L_invalid_distance_code /* if ((op & 64) != 0) */
694
695	movl $1, %eax
696	shll %cl, %eax
697	decl %eax
698	andl hold_r, %eax /* eax &= hold */
699	addl %edx, %eax /* eax += this.val */
700	movl dcode(%esp), %edx /* edx = dcode */
701	movl (%edx,%eax,4), %eax /* eax = dcode[val + (hold&mask[op])] */
702	jmp .L_dodist
703
704	.align 16,0x90
705	.L_clip_window:
706	/* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
707	* %ecx = nbytes
708	*
709	* else {
710	* if (dist > wsize) {
711	* invalid distance
712	* }
713	* from = window;
714	* nbytes = dist - nbytes;
715	* if (write == 0) {
716	* from += wsize - nbytes;
717	*/
718	#define nbytes_r %ecx
719	movl %eax, nbytes_r
720	movl wsize(%esp), %eax /* prepare for dist compare */
721	negl nbytes_r /* nbytes = -nbytes */
722	movl window(%esp), from_r /* from = window */
723
724	cmpl dist_r, %eax
725	jb .L_invalid_distance_too_far /* if (dist > wsize) */
726
727	addl dist_r, nbytes_r /* nbytes = dist - nbytes */
728	cmpl $0, write(%esp)
729	jne .L_wrap_around_window /* if (write != 0) */
730
731	subl nbytes_r, %eax
732	addl %eax, from_r /* from += wsize - nbytes */
733
734	/* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
735	* %ecx = nbytes, %eax = len
736	*
737	* if (nbytes < len) {
738	* len -= nbytes;
739	* do {
740	* PUP(out) = PUP(from);
741	* } while (--nbytes);
742	* from = out - dist;
743	* }
744	* }
745	*/
746	#define len_r %eax
747	movl len(%esp), len_r
748	cmpl nbytes_r, len_r
749	jbe .L_do_copy1 /* if (nbytes >= len) */
750
751	subl nbytes_r, len_r /* len -= nbytes */
752	rep movsb
753	movl out_r, from_r
754	subl dist_r, from_r /* from = out - dist */
755	jmp .L_do_copy1
756
757	cmpl nbytes_r, len_r
758	jbe .L_do_copy1 /* if (nbytes >= len) */
759
760	subl nbytes_r, len_r /* len -= nbytes */
761	rep movsb
762	movl out_r, from_r
763	subl dist_r, from_r /* from = out - dist */
764	jmp .L_do_copy1
765
766	.L_wrap_around_window:
767	/* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
768	* %ecx = nbytes, %eax = write, %eax = len
769	*
770	* else if (write < nbytes) {
771	* from += wsize + write - nbytes;
772	* nbytes -= write;
773	* if (nbytes < len) {
774	* len -= nbytes;
775	* do {
776	* PUP(out) = PUP(from);
777	* } while (--nbytes);
778	* from = window;
779	* nbytes = write;
780	* if (nbytes < len) {
781	* len -= nbytes;
782	* do {
783	* PUP(out) = PUP(from);
784	* } while(--nbytes);
785	* from = out - dist;
786	* }
787	* }
788	* }
789	*/
790	#define write_r %eax
791	movl write(%esp), write_r
792	cmpl write_r, nbytes_r
793	jbe .L_contiguous_in_window /* if (write >= nbytes) */
794
795	addl wsize(%esp), from_r
796	addl write_r, from_r
797	subl nbytes_r, from_r /* from += wsize + write - nbytes */
798	subl write_r, nbytes_r /* nbytes -= write */
799	#undef write_r
800
801	movl len(%esp), len_r
802	cmpl nbytes_r, len_r
803	jbe .L_do_copy1 /* if (nbytes >= len) */
804
805	subl nbytes_r, len_r /* len -= nbytes */
806	rep movsb
807	movl window(%esp), from_r /* from = window */
808	movl write(%esp), nbytes_r /* nbytes = write */
809	cmpl nbytes_r, len_r
810	jbe .L_do_copy1 /* if (nbytes >= len) */
811
812	subl nbytes_r, len_r /* len -= nbytes */
813	rep movsb
814	movl out_r, from_r
815	subl dist_r, from_r /* from = out - dist */
816	jmp .L_do_copy1
817
818	.L_contiguous_in_window:
819	/* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
820	* %ecx = nbytes, %eax = write, %eax = len
821	*
822	* else {
823	* from += write - nbytes;
824	* if (nbytes < len) {
825	* len -= nbytes;
826	* do {
827	* PUP(out) = PUP(from);
828	* } while (--nbytes);
829	* from = out - dist;
830	* }
831	* }
832	*/
833	#define write_r %eax
834	addl write_r, from_r
835	subl nbytes_r, from_r /* from += write - nbytes */
836	#undef write_r
837
838	movl len(%esp), len_r
839	cmpl nbytes_r, len_r
840	jbe .L_do_copy1 /* if (nbytes >= len) */
841
842	subl nbytes_r, len_r /* len -= nbytes */
843	rep movsb
844	movl out_r, from_r
845	subl dist_r, from_r /* from = out - dist */
846
847	.L_do_copy1:
848	/* regs: %esi = from, %esi = in, %ebp = hold, %bl = bits, %edi = out
849	* %eax = len
850	*
851	* while (len > 0) {
852	* PUP(out) = PUP(from);
853	* len--;
854	* }
855	* }
856	* } while (in < last && out < end);
857	*/
858	#undef nbytes_r
859	#define in_r %esi
860	movl len_r, %ecx
861	rep movsb
862
863	movl in(%esp), in_r /* move in back to %esi, toss from */
864	jmp .L_while_test
865
866	#undef len_r
867	#undef dist_r
868
869	#endif /* NO_MMX \|\| RUN_TIME_MMX */
870
871
872	/* MMX code */
873
874	#if defined( USE_MMX ) \|\| defined( RUN_TIME_MMX )
875
876	.align 32,0x90
877	.L_init_mmx:
878	emms
879
880	#undef bits_r
881	#undef bitslong_r
882	#define bitslong_r %ebp
883	#define hold_mm %mm0
884	movd %ebp, hold_mm
885	movl %ebx, bitslong_r
886
887	#define used_mm %mm1
888	#define dmask2_mm %mm2
889	#define lmask2_mm %mm3
890	#define lmask_mm %mm4
891	#define dmask_mm %mm5
892	#define tmp_mm %mm6
893
894	movd lmask(%esp), lmask_mm
895	movq lmask_mm, lmask2_mm
896	movd dmask(%esp), dmask_mm
897	movq dmask_mm, dmask2_mm
898	pxor used_mm, used_mm
899	movl lcode(%esp), %ebx /* ebx = lcode */
900	jmp .L_do_loop_mmx
901
902	.align 32,0x90
903	.L_while_test_mmx:
904	/* while (in < last && out < end)
905	*/
906	cmpl out_r, end(%esp)
907	jbe .L_break_loop /* if (out >= end) */
908
909	cmpl in_r, last(%esp)
910	jbe .L_break_loop
911
912	.L_do_loop_mmx:
913	psrlq used_mm, hold_mm /* hold_mm >>= last bit length */
914
915	cmpl $32, bitslong_r
916	ja .L_get_length_code_mmx /* if (32 < bits) */
917
918	movd bitslong_r, tmp_mm
919	movd (in_r), %mm7
920	addl $4, in_r
921	psllq tmp_mm, %mm7
922	addl $32, bitslong_r
923	por %mm7, hold_mm /* hold_mm \|= ((uint )in)++ << bits */
924
925	.L_get_length_code_mmx:
926	pand hold_mm, lmask_mm
927	movd lmask_mm, %eax
928	movq lmask2_mm, lmask_mm
929	movl (%ebx,%eax,4), %eax /* eax = lcode[hold & lmask] */
930
931	.L_dolen_mmx:
932	movzbl %ah, %ecx /* ecx = this.bits */
933	movd %ecx, used_mm
934	subl %ecx, bitslong_r /* bits -= this.bits */
935
936	testb %al, %al
937	jnz .L_test_for_length_base_mmx /* if (op != 0) 45.7% */
938
939	shrl $16, %eax /* output this.val char */
940	stosb
941	jmp .L_while_test_mmx
942
943	.L_test_for_length_base_mmx:
944	#define len_r %edx
945	movl %eax, len_r /* len = this */
946	shrl $16, len_r /* len = this.val */
947
948	testb $16, %al
949	jz .L_test_for_second_level_length_mmx /* if ((op & 16) == 0) 8% */
950	andl $15, %eax /* op &= 15 */
951	jz .L_decode_distance_mmx /* if (!op) */
952
953	psrlq used_mm, hold_mm /* hold_mm >>= last bit length */
954	movd %eax, used_mm
955	movd hold_mm, %ecx
956	subl %eax, bitslong_r
957	andl .L_mask(,%eax,4), %ecx
958	addl %ecx, len_r /* len += hold & mask[op] */
959
960	.L_decode_distance_mmx:
961	psrlq used_mm, hold_mm /* hold_mm >>= last bit length */
962
963	cmpl $32, bitslong_r
964	ja .L_get_dist_code_mmx /* if (32 < bits) */
965
966	movd bitslong_r, tmp_mm
967	movd (in_r), %mm7
968	addl $4, in_r
969	psllq tmp_mm, %mm7
970	addl $32, bitslong_r
971	por %mm7, hold_mm /* hold_mm \|= ((uint )in)++ << bits */
972
973	.L_get_dist_code_mmx:
974	movl dcode(%esp), %ebx /* ebx = dcode */
975	pand hold_mm, dmask_mm
976	movd dmask_mm, %eax
977	movq dmask2_mm, dmask_mm
978	movl (%ebx,%eax,4), %eax /* eax = dcode[hold & lmask] */
979
980	.L_dodist_mmx:
981	#define dist_r %ebx
982	movzbl %ah, %ecx /* ecx = this.bits */
983	movl %eax, dist_r
984	shrl $16, dist_r /* dist = this.val */
985	subl %ecx, bitslong_r /* bits -= this.bits */
986	movd %ecx, used_mm
987
988	testb $16, %al /* if ((op & 16) == 0) */
989	jz .L_test_for_second_level_dist_mmx
990	andl $15, %eax /* op &= 15 */
991	jz .L_check_dist_one_mmx
992
993	.L_add_bits_to_dist_mmx:
994	psrlq used_mm, hold_mm /* hold_mm >>= last bit length */
995	movd %eax, used_mm /* save bit length of current op */
996	movd hold_mm, %ecx /* get the next bits on input stream */
997	subl %eax, bitslong_r /* bits -= op bits */
998	andl .L_mask(,%eax,4), %ecx /* ecx = hold & mask[op] */
999	addl %ecx, dist_r /* dist += hold & mask[op] */
1000
1001	.L_check_window_mmx:
1002	movl in_r, in(%esp) /* save in so from can use it's reg */
1003	movl out_r, %eax
1004	subl beg(%esp), %eax /* nbytes = out - beg */
1005
1006	cmpl dist_r, %eax
1007	jb .L_clip_window_mmx /* if (dist > nbytes) 4.2% */
1008
1009	movl len_r, %ecx
1010	movl out_r, from_r
1011	subl dist_r, from_r /* from = out - dist */
1012
1013	subl $3, %ecx
1014	movb (from_r), %al
1015	movb %al, (out_r)
1016	movb 1(from_r), %al
1017	movb 2(from_r), %dl
1018	addl $3, from_r
1019	movb %al, 1(out_r)
1020	movb %dl, 2(out_r)
1021	addl $3, out_r
1022	rep movsb
1023
1024	movl in(%esp), in_r /* move in back to %esi, toss from */
1025	movl lcode(%esp), %ebx /* move lcode back to %ebx, toss dist */
1026	jmp .L_while_test_mmx
1027
1028	.align 16,0x90
1029	.L_check_dist_one_mmx:
1030	cmpl $1, dist_r
1031	jne .L_check_window_mmx
1032	cmpl out_r, beg(%esp)
1033	je .L_check_window_mmx
1034
1035	decl out_r
1036	movl len_r, %ecx
1037	movb (out_r), %al
1038	subl $3, %ecx
1039
1040	movb %al, 1(out_r)
1041	movb %al, 2(out_r)
1042	movb %al, 3(out_r)
1043	addl $4, out_r
1044	rep stosb
1045
1046	movl lcode(%esp), %ebx /* move lcode back to %ebx, toss dist */
1047	jmp .L_while_test_mmx
1048
1049	.align 16,0x90
1050	.L_test_for_second_level_length_mmx:
1051	testb $64, %al
1052	jnz .L_test_for_end_of_block /* if ((op & 64) != 0) */
1053
1054	andl $15, %eax
1055	psrlq used_mm, hold_mm /* hold_mm >>= last bit length */
1056	movd hold_mm, %ecx
1057	andl .L_mask(,%eax,4), %ecx
1058	addl len_r, %ecx
1059	movl (%ebx,%ecx,4), %eax /* eax = lcode[hold & lmask] */
1060	jmp .L_dolen_mmx
1061
1062	.align 16,0x90
1063	.L_test_for_second_level_dist_mmx:
1064	testb $64, %al
1065	jnz .L_invalid_distance_code /* if ((op & 64) != 0) */
1066
1067	andl $15, %eax
1068	psrlq used_mm, hold_mm /* hold_mm >>= last bit length */
1069	movd hold_mm, %ecx
1070	andl .L_mask(,%eax,4), %ecx
1071	movl dcode(%esp), %eax /* ecx = dcode */
1072	addl dist_r, %ecx
1073	movl (%eax,%ecx,4), %eax /* eax = lcode[hold & lmask] */
1074	jmp .L_dodist_mmx
1075
1076	.align 16,0x90
1077	.L_clip_window_mmx:
1078	#define nbytes_r %ecx
1079	movl %eax, nbytes_r
1080	movl wsize(%esp), %eax /* prepare for dist compare */
1081	negl nbytes_r /* nbytes = -nbytes */
1082	movl window(%esp), from_r /* from = window */
1083
1084	cmpl dist_r, %eax
1085	jb .L_invalid_distance_too_far /* if (dist > wsize) */
1086
1087	addl dist_r, nbytes_r /* nbytes = dist - nbytes */
1088	cmpl $0, write(%esp)
1089	jne .L_wrap_around_window_mmx /* if (write != 0) */
1090
1091	subl nbytes_r, %eax
1092	addl %eax, from_r /* from += wsize - nbytes */
1093
1094	cmpl nbytes_r, len_r
1095	jbe .L_do_copy1_mmx /* if (nbytes >= len) */
1096
1097	subl nbytes_r, len_r /* len -= nbytes */
1098	rep movsb
1099	movl out_r, from_r
1100	subl dist_r, from_r /* from = out - dist */
1101	jmp .L_do_copy1_mmx
1102
1103	cmpl nbytes_r, len_r
1104	jbe .L_do_copy1_mmx /* if (nbytes >= len) */
1105
1106	subl nbytes_r, len_r /* len -= nbytes */
1107	rep movsb
1108	movl out_r, from_r
1109	subl dist_r, from_r /* from = out - dist */
1110	jmp .L_do_copy1_mmx
1111
1112	.L_wrap_around_window_mmx:
1113	#define write_r %eax
1114	movl write(%esp), write_r
1115	cmpl write_r, nbytes_r
1116	jbe .L_contiguous_in_window_mmx /* if (write >= nbytes) */
1117
1118	addl wsize(%esp), from_r
1119	addl write_r, from_r
1120	subl nbytes_r, from_r /* from += wsize + write - nbytes */
1121	subl write_r, nbytes_r /* nbytes -= write */
1122	#undef write_r
1123
1124	cmpl nbytes_r, len_r
1125	jbe .L_do_copy1_mmx /* if (nbytes >= len) */
1126
1127	subl nbytes_r, len_r /* len -= nbytes */
1128	rep movsb
1129	movl window(%esp), from_r /* from = window */
1130	movl write(%esp), nbytes_r /* nbytes = write */
1131	cmpl nbytes_r, len_r
1132	jbe .L_do_copy1_mmx /* if (nbytes >= len) */
1133
1134	subl nbytes_r, len_r /* len -= nbytes */
1135	rep movsb
1136	movl out_r, from_r
1137	subl dist_r, from_r /* from = out - dist */
1138	jmp .L_do_copy1_mmx
1139
1140	.L_contiguous_in_window_mmx:
1141	#define write_r %eax
1142	addl write_r, from_r
1143	subl nbytes_r, from_r /* from += write - nbytes */
1144	#undef write_r
1145
1146	cmpl nbytes_r, len_r
1147	jbe .L_do_copy1_mmx /* if (nbytes >= len) */
1148
1149	subl nbytes_r, len_r /* len -= nbytes */
1150	rep movsb
1151	movl out_r, from_r
1152	subl dist_r, from_r /* from = out - dist */
1153
1154	.L_do_copy1_mmx:
1155	#undef nbytes_r
1156	#define in_r %esi
1157	movl len_r, %ecx
1158	rep movsb
1159
1160	movl in(%esp), in_r /* move in back to %esi, toss from */
1161	movl lcode(%esp), %ebx /* move lcode back to %ebx, toss dist */
1162	jmp .L_while_test_mmx
1163
1164	#undef hold_r
1165	#undef bitslong_r
1166
1167	#endif /* USE_MMX \|\| RUN_TIME_MMX */
1168
1169
1170	/* USE_MMX, NO_MMX, and RUNTIME_MMX from here on */
1171
1172	.L_invalid_distance_code:
1173	/* else {
1174	* strm->msg = "invalid distance code";
1175	* state->mode = BAD;
1176	* }
1177	*/
1178	movl $.L_invalid_distance_code_msg, %ecx
1179	movl $INFLATE_MODE_BAD, %edx
1180	jmp .L_update_stream_state
1181
1182	.L_test_for_end_of_block:
1183	/* else if (op & 32) {
1184	* state->mode = TYPE;
1185	* break;
1186	* }
1187	*/
1188	testb $32, %al
1189	jz .L_invalid_literal_length_code /* if ((op & 32) == 0) */
1190
1191	movl $0, %ecx
1192	movl $INFLATE_MODE_TYPE, %edx
1193	jmp .L_update_stream_state
1194
1195	.L_invalid_literal_length_code:
1196	/* else {
1197	* strm->msg = "invalid literal/length code";
1198	* state->mode = BAD;
1199	* }
1200	*/
1201	movl $.L_invalid_literal_length_code_msg, %ecx
1202	movl $INFLATE_MODE_BAD, %edx
1203	jmp .L_update_stream_state
1204
1205	.L_invalid_distance_too_far:
1206	/* strm->msg = "invalid distance too far back";
1207	* state->mode = BAD;
1208	*/
1209	movl in(%esp), in_r /* from_r has in's reg, put in back */
1210	movl $.L_invalid_distance_too_far_msg, %ecx
1211	movl $INFLATE_MODE_BAD, %edx
1212	jmp .L_update_stream_state
1213
1214	.L_update_stream_state:
1215	/* set strm->msg = %ecx, strm->state->mode = %edx */
1216	movl strm_sp(%esp), %eax
1217	testl %ecx, %ecx /* if (msg != NULL) */
1218	jz .L_skip_msg
1219	movl %ecx, msg_strm(%eax) /* strm->msg = msg */
1220	.L_skip_msg:
1221	movl state_strm(%eax), %eax /* state = strm->state */
1222	movl %edx, mode_state(%eax) /* state->mode = edx (BAD \| TYPE) */
1223	jmp .L_break_loop
1224
1225	.align 32,0x90
1226	.L_break_loop:
1227
1228	/*
1229	* Regs:
1230	*
1231	* bits = %ebp when mmx, and in %ebx when non-mmx
1232	* hold = %hold_mm when mmx, and in %ebp when non-mmx
1233	* in = %esi
1234	* out = %edi
1235	*/
1236
1237	#if defined( USE_MMX ) \|\| defined( RUN_TIME_MMX )
1238
1239	#if defined( RUN_TIME_MMX )
1240
1241	cmpl $DO_USE_MMX, inflate_fast_use_mmx
1242	jne .L_update_next_in
1243
1244	#endif /* RUN_TIME_MMX */
1245
1246	movl %ebp, %ebx
1247
1248	.L_update_next_in:
1249
1250	#endif
1251
1252	#define strm_r %eax
1253	#define state_r %edx
1254
1255	/* len = bits >> 3;
1256	* in -= len;
1257	* bits -= len << 3;
1258	* hold &= (1U << bits) - 1;
1259	* state->hold = hold;
1260	* state->bits = bits;
1261	* strm->next_in = in;
1262	* strm->next_out = out;
1263	*/
1264	movl strm_sp(%esp), strm_r
1265	movl %ebx, %ecx
1266	movl state_strm(strm_r), state_r
1267	shrl $3, %ecx
1268	subl %ecx, in_r
1269	shll $3, %ecx
1270	subl %ecx, %ebx
1271	movl out_r, next_out_strm(strm_r)
1272	movl %ebx, bits_state(state_r)
1273	movl %ebx, %ecx
1274
1275	leal buf(%esp), %ebx
1276	cmpl %ebx, last(%esp)
1277	jne .L_buf_not_used /* if buf != last */
1278
1279	subl %ebx, in_r /* in -= buf */
1280	movl next_in_strm(strm_r), %ebx
1281	movl %ebx, last(%esp) /* last = strm->next_in */
1282	addl %ebx, in_r /* in += strm->next_in */
1283	movl avail_in_strm(strm_r), %ebx
1284	subl $11, %ebx
1285	addl %ebx, last(%esp) /* last = &strm->next_in[ avail_in - 11 ] */
1286
1287	.L_buf_not_used:
1288	movl in_r, next_in_strm(strm_r)
1289
1290	movl $1, %ebx
1291	shll %cl, %ebx
1292	decl %ebx
1293
1294	#if defined( USE_MMX ) \|\| defined( RUN_TIME_MMX )
1295
1296	#if defined( RUN_TIME_MMX )
1297
1298	cmpl $DO_USE_MMX, inflate_fast_use_mmx
1299	jne .L_update_hold
1300
1301	#endif /* RUN_TIME_MMX */
1302
1303	psrlq used_mm, hold_mm /* hold_mm >>= last bit length */
1304	movd hold_mm, %ebp
1305
1306	emms
1307
1308	.L_update_hold:
1309
1310	#endif /* USE_MMX \|\| RUN_TIME_MMX */
1311
1312	andl %ebx, %ebp
1313	movl %ebp, hold_state(state_r)
1314
1315	#define last_r %ebx
1316
1317	/* strm->avail_in = in < last ? 11 + (last - in) : 11 - (in - last) */
1318	movl last(%esp), last_r
1319	cmpl in_r, last_r
1320	jbe .L_last_is_smaller /* if (in >= last) */
1321
1322	subl in_r, last_r /* last -= in */
1323	addl $11, last_r /* last += 11 */
1324	movl last_r, avail_in_strm(strm_r)
1325	jmp .L_fixup_out
1326	.L_last_is_smaller:
1327	subl last_r, in_r /* in -= last */
1328	negl in_r /* in = -in */
1329	addl $11, in_r /* in += 11 */
1330	movl in_r, avail_in_strm(strm_r)
1331
1332	#undef last_r
1333	#define end_r %ebx
1334
1335	.L_fixup_out:
1336	/* strm->avail_out = out < end ? 257 + (end - out) : 257 - (out - end)*/
1337	movl end(%esp), end_r
1338	cmpl out_r, end_r
1339	jbe .L_end_is_smaller /* if (out >= end) */
1340
1341	subl out_r, end_r /* end -= out */
1342	addl $257, end_r /* end += 257 */
1343	movl end_r, avail_out_strm(strm_r)
1344	jmp .L_done
1345	.L_end_is_smaller:
1346	subl end_r, out_r /* out -= end */
1347	negl out_r /* out = -out */
1348	addl $257, out_r /* out += 257 */
1349	movl out_r, avail_out_strm(strm_r)
1350
1351	#undef end_r
1352	#undef strm_r
1353	#undef state_r
1354
1355	.L_done:
1356	addl $local_var_size, %esp
1357	popf
1358	popl %ebx
1359	popl %ebp
1360	popl %esi
1361	popl %edi
1362	ret
1363
1364	#if defined( GAS_ELF )
1365	/* elf info */
1366	.type inflate_fast,@function
1367	.size inflate_fast,.-inflate_fast
1368	#endif

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