summaryrefslogtreecommitdiffhomepage
path: root/zlib/contrib/inflate86/inffas86.c
blob: 7292f67b753795a33aff274e4adcbf561f78c75c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
/* inffas86.c is a hand tuned assembler version of
 *
 * inffast.c -- fast decoding
 * Copyright (C) 1995-2003 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 *
 * Copyright (C) 2003 Chris Anderson <christop@charm.net>
 * Please use the copyright conditions above.
 *
 * Dec-29-2003 -- I added AMD64 inflate asm support.  This version is also
 * slightly quicker on x86 systems because, instead of using rep movsb to copy
 * data, it uses rep movsw, which moves data in 2-byte chunks instead of single
 * bytes.  I've tested the AMD64 code on a Fedora Core 1 + the x86_64 updates
 * from http://fedora.linux.duke.edu/fc1_x86_64
 * which is running on an Athlon 64 3000+ / Gigabyte GA-K8VT800M system with
 * 1GB ram.  The 64-bit version is about 4% faster than the 32-bit version,
 * when decompressing mozilla-source-1.3.tar.gz.
 *
 * Mar-13-2003 -- Most of this is derived from inffast.S which is derived from
 * the gcc -S output of zlib-1.2.0/inffast.c.  Zlib-1.2.0 is in beta release at
 * the moment.  I have successfully compiled and tested this code with gcc2.96,
 * gcc3.2, icc5.0, msvc6.0.  It is very close to the speed of inffast.S
 * compiled with gcc -DNO_MMX, but inffast.S is still faster on the P3 with MMX
 * enabled.  I will attempt to merge the MMX code into this version.  Newer
 * versions of this and inffast.S can be found at
 * http://www.eetbeetee.com/zlib/ and http://www.charm.net/~christop/zlib/
 */

#include "zutil.h"
#include "inftrees.h"
#include "inflate.h"
#include "inffast.h"

/* Mark Adler's comments from inffast.c: */

/*
   Decode literal, length, and distance codes and write out the resulting
   literal and match bytes until either not enough input or output is
   available, an end-of-block is encountered, or a data error is encountered.
   When large enough input and output buffers are supplied to inflate(), for
   example, a 16K input buffer and a 64K output buffer, more than 95% of the
   inflate execution time is spent in this routine.

   Entry assumptions:

        state->mode == LEN
        strm->avail_in >= 6
        strm->avail_out >= 258
        start >= strm->avail_out
        state->bits < 8

   On return, state->mode is one of:

        LEN -- ran out of enough output space or enough available input
        TYPE -- reached end of block code, inflate() to interpret next block
        BAD -- error in block data

   Notes:

    - The maximum input bits used by a length/distance pair is 15 bits for the
      length code, 5 bits for the length extra, 15 bits for the distance code,
      and 13 bits for the distance extra.  This totals 48 bits, or six bytes.
      Therefore if strm->avail_in >= 6, then there is enough input to avoid
      checking for available input while decoding.

    - The maximum bytes that a single length/distance pair can output is 258
      bytes, which is the maximum length that can be coded.  inflate_fast()
      requires strm->avail_out >= 258 for each loop to avoid checking for
      output space.
 */
void inflate_fast(strm, start)
z_streamp strm;
unsigned start;         /* inflate()'s starting value for strm->avail_out */
{
    struct inflate_state FAR *state;
    struct inffast_ar {
/* 64   32                               x86  x86_64 */
/* ar offset                              register */
/*  0    0 */ void *esp;                /* esp save */
/*  8    4 */ void *ebp;                /* ebp save */
/* 16    8 */ unsigned char FAR *in;    /* esi rsi  local strm->next_in */
/* 24   12 */ unsigned char FAR *last;  /*     r9   while in < last */
/* 32   16 */ unsigned char FAR *out;   /* edi rdi  local strm->next_out */
/* 40   20 */ unsigned char FAR *beg;   /*          inflate()'s init next_out */
/* 48   24 */ unsigned char FAR *end;   /*     r10  while out < end */
/* 56   28 */ unsigned char FAR *window;/*          size of window, wsize!=0 */
/* 64   32 */ code const FAR *lcode;    /* ebp rbp  local strm->lencode */
/* 72   36 */ code const FAR *dcode;    /*     r11  local strm->distcode */
/* 80   40 */ unsigned long hold;       /* edx rdx  local strm->hold */
/* 88   44 */ unsigned bits;            /* ebx rbx  local strm->bits */
/* 92   48 */ unsigned wsize;           /*          window size */
/* 96   52 */ unsigned write;           /*          window write index */
/*100   56 */ unsigned lmask;           /*     r12  mask for lcode */
/*104   60 */ unsigned dmask;           /*     r13  mask for dcode */
/*108   64 */ unsigned len;             /*     r14  match length */
/*112   68 */ unsigned dist;            /*     r15  match distance */
/*116   72 */ unsigned status;          /*          set when state chng*/
    } ar;

#if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )
#define PAD_AVAIL_IN 6
#define PAD_AVAIL_OUT 258
#else
#define PAD_AVAIL_IN 5
#define PAD_AVAIL_OUT 257
#endif

    /* copy state to local variables */
    state = (struct inflate_state FAR *)strm->state;
    ar.in = strm->next_in;
    ar.last = ar.in + (strm->avail_in - PAD_AVAIL_IN);
    ar.out = strm->next_out;
    ar.beg = ar.out - (start - strm->avail_out);
    ar.end = ar.out + (strm->avail_out - PAD_AVAIL_OUT);
    ar.wsize = state->wsize;
    ar.write = state->wnext;
    ar.window = state->window;
    ar.hold = state->hold;
    ar.bits = state->bits;
    ar.lcode = state->lencode;
    ar.dcode = state->distcode;
    ar.lmask = (1U << state->lenbits) - 1;
    ar.dmask = (1U << state->distbits) - 1;

    /* decode literals and length/distances until end-of-block or not enough
       input data or output space */

    /* align in on 1/2 hold size boundary */
    while (((unsigned long)(void *)ar.in & (sizeof(ar.hold) / 2 - 1)) != 0) {
        ar.hold += (unsigned long)*ar.in++ << ar.bits;
        ar.bits += 8;
    }

#if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )
    __asm__ __volatile__ (
"        leaq    %0, %%rax\n"
"        movq    %%rbp, 8(%%rax)\n"       /* save regs rbp and rsp */
"        movq    %%rsp, (%%rax)\n"
"        movq    %%rax, %%rsp\n"          /* make rsp point to &ar */
"        movq    16(%%rsp), %%rsi\n"      /* rsi  = in */
"        movq    32(%%rsp), %%rdi\n"      /* rdi  = out */
"        movq    24(%%rsp), %%r9\n"       /* r9   = last */
"        movq    48(%%rsp), %%r10\n"      /* r10  = end */
"        movq    64(%%rsp), %%rbp\n"      /* rbp  = lcode */
"        movq    72(%%rsp), %%r11\n"      /* r11  = dcode */
"        movq    80(%%rsp), %%rdx\n"      /* rdx  = hold */
"        movl    88(%%rsp), %%ebx\n"      /* ebx  = bits */
"        movl    100(%%rsp), %%r12d\n"    /* r12d = lmask */
"        movl    104(%%rsp), %%r13d\n"    /* r13d = dmask */
                                          /* r14d = len */
                                          /* r15d = dist */
"        cld\n"
"        cmpq    %%rdi, %%r10\n"
"        je      .L_one_time\n"           /* if only one decode left */
"        cmpq    %%rsi, %%r9\n"
"        je      .L_one_time\n"
"        jmp     .L_do_loop\n"

".L_one_time:\n"
"        movq    %%r12, %%r8\n"           /* r8 = lmask */
"        cmpb    $32, %%bl\n"
"        ja      .L_get_length_code_one_time\n"

"        lodsl\n"                         /* eax = *(uint *)in++ */
"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
"        addb    $32, %%bl\n"             /* bits += 32 */
"        shlq    %%cl, %%rax\n"
"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */
"        jmp     .L_get_length_code_one_time\n"

".align 32,0x90\n"
".L_while_test:\n"
"        cmpq    %%rdi, %%r10\n"
"        jbe     .L_break_loop\n"
"        cmpq    %%rsi, %%r9\n"
"        jbe     .L_break_loop\n"

".L_do_loop:\n"
"        movq    %%r12, %%r8\n"           /* r8 = lmask */
"        cmpb    $32, %%bl\n"
"        ja      .L_get_length_code\n"    /* if (32 < bits) */

"        lodsl\n"                         /* eax = *(uint *)in++ */
"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
"        addb    $32, %%bl\n"             /* bits += 32 */
"        shlq    %%cl, %%rax\n"
"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */

".L_get_length_code:\n"
"        andq    %%rdx, %%r8\n"            /* r8 &= hold */
"        movl    (%%rbp,%%r8,4), %%eax\n"  /* eax = lcode[hold & lmask] */

"        movb    %%ah, %%cl\n"            /* cl = this.bits */
"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */

"        testb   %%al, %%al\n"
"        jnz     .L_test_for_length_base\n" /* if (op != 0) 45.7% */

"        movq    %%r12, %%r8\n"            /* r8 = lmask */
"        shrl    $16, %%eax\n"            /* output this.val char */
"        stosb\n"

".L_get_length_code_one_time:\n"
"        andq    %%rdx, %%r8\n"            /* r8 &= hold */
"        movl    (%%rbp,%%r8,4), %%eax\n" /* eax = lcode[hold & lmask] */

".L_dolen:\n"
"        movb    %%ah, %%cl\n"            /* cl = this.bits */
"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */

"        testb   %%al, %%al\n"
"        jnz     .L_test_for_length_base\n" /* if (op != 0) 45.7% */

"        shrl    $16, %%eax\n"            /* output this.val char */
"        stosb\n"
"        jmp     .L_while_test\n"

".align 32,0x90\n"
".L_test_for_length_base:\n"
"        movl    %%eax, %%r14d\n"         /* len = this */
"        shrl    $16, %%r14d\n"           /* len = this.val */
"        movb    %%al, %%cl\n"

"        testb   $16, %%al\n"
"        jz      .L_test_for_second_level_length\n" /* if ((op & 16) == 0) 8% */
"        andb    $15, %%cl\n"             /* op &= 15 */
"        jz      .L_decode_distance\n"    /* if (!op) */

".L_add_bits_to_len:\n"
"        subb    %%cl, %%bl\n"
"        xorl    %%eax, %%eax\n"
"        incl    %%eax\n"
"        shll    %%cl, %%eax\n"
"        decl    %%eax\n"
"        andl    %%edx, %%eax\n"          /* eax &= hold */
"        shrq    %%cl, %%rdx\n"
"        addl    %%eax, %%r14d\n"         /* len += hold & mask[op] */

".L_decode_distance:\n"
"        movq    %%r13, %%r8\n"           /* r8 = dmask */
"        cmpb    $32, %%bl\n"
"        ja      .L_get_distance_code\n"  /* if (32 < bits) */

"        lodsl\n"                         /* eax = *(uint *)in++ */
"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
"        addb    $32, %%bl\n"             /* bits += 32 */
"        shlq    %%cl, %%rax\n"
"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */

".L_get_distance_code:\n"
"        andq    %%rdx, %%r8\n"           /* r8 &= hold */
"        movl    (%%r11,%%r8,4), %%eax\n" /* eax = dcode[hold & dmask] */

".L_dodist:\n"
"        movl    %%eax, %%r15d\n"         /* dist = this */
"        shrl    $16, %%r15d\n"           /* dist = this.val */
"        movb    %%ah, %%cl\n"
"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */
"        movb    %%al, %%cl\n"            /* cl = this.op */

"        testb   $16, %%al\n"             /* if ((op & 16) == 0) */
"        jz      .L_test_for_second_level_dist\n"
"        andb    $15, %%cl\n"             /* op &= 15 */
"        jz      .L_check_dist_one\n"

".L_add_bits_to_dist:\n"
"        subb    %%cl, %%bl\n"
"        xorl    %%eax, %%eax\n"
"        incl    %%eax\n"
"        shll    %%cl, %%eax\n"
"        decl    %%eax\n"                 /* (1 << op) - 1 */
"        andl    %%edx, %%eax\n"          /* eax &= hold */
"        shrq    %%cl, %%rdx\n"
"        addl    %%eax, %%r15d\n"         /* dist += hold & ((1 << op) - 1) */

".L_check_window:\n"
"        movq    %%rsi, %%r8\n"           /* save in so from can use it's reg */
"        movq    %%rdi, %%rax\n"
"        subq    40(%%rsp), %%rax\n"      /* nbytes = out - beg */

"        cmpl    %%r15d, %%eax\n"
"        jb      .L_clip_window\n"        /* if (dist > nbytes) 4.2% */

"        movl    %%r14d, %%ecx\n"         /* ecx = len */
"        movq    %%rdi, %%rsi\n"
"        subq    %%r15, %%rsi\n"          /* from = out - dist */

"        sarl    %%ecx\n"
"        jnc     .L_copy_two\n"           /* if len % 2 == 0 */

"        rep     movsw\n"
"        movb    (%%rsi), %%al\n"
"        movb    %%al, (%%rdi)\n"
"        incq    %%rdi\n"

"        movq    %%r8, %%rsi\n"           /* move in back to %rsi, toss from */
"        jmp     .L_while_test\n"

".L_copy_two:\n"
"        rep     movsw\n"
"        movq    %%r8, %%rsi\n"           /* move in back to %rsi, toss from */
"        jmp     .L_while_test\n"

".align 32,0x90\n"
".L_check_dist_one:\n"
"        cmpl    $1, %%r15d\n"            /* if dist 1, is a memset */
"        jne     .L_check_window\n"
"        cmpq    %%rdi, 40(%%rsp)\n"      /* if out == beg, outside window */
"        je      .L_check_window\n"

"        movl    %%r14d, %%ecx\n"         /* ecx = len */
"        movb    -1(%%rdi), %%al\n"
"        movb    %%al, %%ah\n"

"        sarl    %%ecx\n"
"        jnc     .L_set_two\n"
"        movb    %%al, (%%rdi)\n"
"        incq    %%rdi\n"

".L_set_two:\n"
"        rep     stosw\n"
"        jmp     .L_while_test\n"

".align 32,0x90\n"
".L_test_for_second_level_length:\n"
"        testb   $64, %%al\n"
"        jnz     .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */

"        xorl    %%eax, %%eax\n"
"        incl    %%eax\n"
"        shll    %%cl, %%eax\n"
"        decl    %%eax\n"
"        andl    %%edx, %%eax\n"         /* eax &= hold */
"        addl    %%r14d, %%eax\n"        /* eax += len */
"        movl    (%%rbp,%%rax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/
"        jmp     .L_dolen\n"

".align 32,0x90\n"
".L_test_for_second_level_dist:\n"
"        testb   $64, %%al\n"
"        jnz     .L_invalid_distance_code\n" /* if ((op & 64) != 0) */

"        xorl    %%eax, %%eax\n"
"        incl    %%eax\n"
"        shll    %%cl, %%eax\n"
"        decl    %%eax\n"
"        andl    %%edx, %%eax\n"         /* eax &= hold */
"        addl    %%r15d, %%eax\n"        /* eax += dist */
"        movl    (%%r11,%%rax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/
"        jmp     .L_dodist\n"

".align 32,0x90\n"
".L_clip_window:\n"
"        movl    %%eax, %%ecx\n"         /* ecx = nbytes */
"        movl    92(%%rsp), %%eax\n"     /* eax = wsize, prepare for dist cmp */
"        negl    %%ecx\n"                /* nbytes = -nbytes */

"        cmpl    %%r15d, %%eax\n"
"        jb      .L_invalid_distance_too_far\n" /* if (dist > wsize) */

"        addl    %%r15d, %%ecx\n"         /* nbytes = dist - nbytes */
"        cmpl    $0, 96(%%rsp)\n"
"        jne     .L_wrap_around_window\n" /* if (write != 0) */

"        movq    56(%%rsp), %%rsi\n"     /* from  = window */
"        subl    %%ecx, %%eax\n"         /* eax  -= nbytes */
"        addq    %%rax, %%rsi\n"         /* from += wsize - nbytes */

"        movl    %%r14d, %%eax\n"        /* eax = len */
"        cmpl    %%ecx, %%r14d\n"
"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */

"        subl    %%ecx, %%eax\n"         /* eax -= nbytes */
"        rep     movsb\n"
"        movq    %%rdi, %%rsi\n"
"        subq    %%r15, %%rsi\n"         /* from = &out[ -dist ] */
"        jmp     .L_do_copy\n"

".align 32,0x90\n"
".L_wrap_around_window:\n"
"        movl    96(%%rsp), %%eax\n"     /* eax = write */
"        cmpl    %%eax, %%ecx\n"
"        jbe     .L_contiguous_in_window\n" /* if (write >= nbytes) */

"        movl    92(%%rsp), %%esi\n"     /* from  = wsize */
"        addq    56(%%rsp), %%rsi\n"     /* from += window */
"        addq    %%rax, %%rsi\n"         /* from += write */
"        subq    %%rcx, %%rsi\n"         /* from -= nbytes */
"        subl    %%eax, %%ecx\n"         /* nbytes -= write */

"        movl    %%r14d, %%eax\n"        /* eax = len */
"        cmpl    %%ecx, %%eax\n"
"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */

"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
"        rep     movsb\n"
"        movq    56(%%rsp), %%rsi\n"     /* from = window */
"        movl    96(%%rsp), %%ecx\n"     /* nbytes = write */
"        cmpl    %%ecx, %%eax\n"
"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */

"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
"        rep     movsb\n"
"        movq    %%rdi, %%rsi\n"
"        subq    %%r15, %%rsi\n"         /* from = out - dist */
"        jmp     .L_do_copy\n"

".align 32,0x90\n"
".L_contiguous_in_window:\n"
"        movq    56(%%rsp), %%rsi\n"     /* rsi = window */
"        addq    %%rax, %%rsi\n"
"        subq    %%rcx, %%rsi\n"         /* from += write - nbytes */

"        movl    %%r14d, %%eax\n"        /* eax = len */
"        cmpl    %%ecx, %%eax\n"
"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */

"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
"        rep     movsb\n"
"        movq    %%rdi, %%rsi\n"
"        subq    %%r15, %%rsi\n"         /* from = out - dist */
"        jmp     .L_do_copy\n"           /* if (nbytes >= len) */

".align 32,0x90\n"
".L_do_copy:\n"
"        movl    %%eax, %%ecx\n"         /* ecx = len */
"        rep     movsb\n"

"        movq    %%r8, %%rsi\n"          /* move in back to %esi, toss from */
"        jmp     .L_while_test\n"

".L_test_for_end_of_block:\n"
"        testb   $32, %%al\n"
"        jz      .L_invalid_literal_length_code\n"
"        movl    $1, 116(%%rsp)\n"
"        jmp     .L_break_loop_with_status\n"

".L_invalid_literal_length_code:\n"
"        movl    $2, 116(%%rsp)\n"
"        jmp     .L_break_loop_with_status\n"

".L_invalid_distance_code:\n"
"        movl    $3, 116(%%rsp)\n"
"        jmp     .L_break_loop_with_status\n"

".L_invalid_distance_too_far:\n"
"        movl    $4, 116(%%rsp)\n"
"        jmp     .L_break_loop_with_status\n"

".L_break_loop:\n"
"        movl    $0, 116(%%rsp)\n"

".L_break_loop_with_status:\n"
/* put in, out, bits, and hold back into ar and pop esp */
"        movq    %%rsi, 16(%%rsp)\n"     /* in */
"        movq    %%rdi, 32(%%rsp)\n"     /* out */
"        movl    %%ebx, 88(%%rsp)\n"     /* bits */
"        movq    %%rdx, 80(%%rsp)\n"     /* hold */
"        movq    (%%rsp), %%rax\n"       /* restore rbp and rsp */
"        movq    8(%%rsp), %%rbp\n"
"        movq    %%rax, %%rsp\n"
          :
          : "m" (ar)
          : "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi",
            "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15"
    );
#elif ( defined( __GNUC__ ) || defined( __ICC ) ) && defined( __i386 )
    __asm__ __volatile__ (
"        leal    %0, %%eax\n"
"        movl    %%esp, (%%eax)\n"        /* save esp, ebp */
"        movl    %%ebp, 4(%%eax)\n"
"        movl    %%eax, %%esp\n"
"        movl    8(%%esp), %%esi\n"       /* esi = in */
"        movl    16(%%esp), %%edi\n"      /* edi = out */
"        movl    40(%%esp), %%edx\n"      /* edx = hold */
"        movl    44(%%esp), %%ebx\n"      /* ebx = bits */
"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */

"        cld\n"
"        jmp     .L_do_loop\n"

".align 32,0x90\n"
".L_while_test:\n"
"        cmpl    %%edi, 24(%%esp)\n"      /* out < end */
"        jbe     .L_break_loop\n"
"        cmpl    %%esi, 12(%%esp)\n"      /* in < last */
"        jbe     .L_break_loop\n"

".L_do_loop:\n"
"        cmpb    $15, %%bl\n"
"        ja      .L_get_length_code\n"    /* if (15 < bits) */

"        xorl    %%eax, %%eax\n"
"        lodsw\n"                         /* al = *(ushort *)in++ */
"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
"        addb    $16, %%bl\n"             /* bits += 16 */
"        shll    %%cl, %%eax\n"
"        orl     %%eax, %%edx\n"        /* hold |= *((ushort *)in)++ << bits */

".L_get_length_code:\n"
"        movl    56(%%esp), %%eax\n"      /* eax = lmask */
"        andl    %%edx, %%eax\n"          /* eax &= hold */
"        movl    (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[hold & lmask] */

".L_dolen:\n"
"        movb    %%ah, %%cl\n"            /* cl = this.bits */
"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
"        shrl    %%cl, %%edx\n"           /* hold >>= this.bits */

"        testb   %%al, %%al\n"
"        jnz     .L_test_for_length_base\n" /* if (op != 0) 45.7% */

"        shrl    $16, %%eax\n"            /* output this.val char */
"        stosb\n"
"        jmp     .L_while_test\n"

".align 32,0x90\n"
".L_test_for_length_base:\n"
"        movl    %%eax, %%ecx\n"          /* len = this */
"        shrl    $16, %%ecx\n"            /* len = this.val */
"        movl    %%ecx, 64(%%esp)\n"      /* save len */
"        movb    %%al, %%cl\n"

"        testb   $16, %%al\n"
"        jz      .L_test_for_second_level_length\n" /* if ((op & 16) == 0) 8% */
"        andb    $15, %%cl\n"             /* op &= 15 */
"        jz      .L_decode_distance\n"    /* if (!op) */
"        cmpb    %%cl, %%bl\n"
"        jae     .L_add_bits_to_len\n"    /* if (op <= bits) */

"        movb    %%cl, %%ch\n"            /* stash op in ch, freeing cl */
"        xorl    %%eax, %%eax\n"
"        lodsw\n"                         /* al = *(ushort *)in++ */
"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
"        addb    $16, %%bl\n"             /* bits += 16 */
"        shll    %%cl, %%eax\n"
"        orl     %%eax, %%edx\n"         /* hold |= *((ushort *)in)++ << bits */
"        movb    %%ch, %%cl\n"            /* move op back to ecx */

".L_add_bits_to_len:\n"
"        subb    %%cl, %%bl\n"
"        xorl    %%eax, %%eax\n"
"        incl    %%eax\n"
"        shll    %%cl, %%eax\n"
"        decl    %%eax\n"
"        andl    %%edx, %%eax\n"          /* eax &= hold */
"        shrl    %%cl, %%edx\n"
"        addl    %%eax, 64(%%esp)\n"      /* len += hold & mask[op] */

".L_decode_distance:\n"
"        cmpb    $15, %%bl\n"
"        ja      .L_get_distance_code\n"  /* if (15 < bits) */

"        xorl    %%eax, %%eax\n"
"        lodsw\n"                         /* al = *(ushort *)in++ */
"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
"        addb    $16, %%bl\n"             /* bits += 16 */
"        shll    %%cl, %%eax\n"
"        orl     %%eax, %%edx\n"         /* hold |= *((ushort *)in)++ << bits */

".L_get_distance_code:\n"
"        movl    60(%%esp), %%eax\n"      /* eax = dmask */
"        movl    36(%%esp), %%ecx\n"      /* ecx = dcode */
"        andl    %%edx, %%eax\n"          /* eax &= hold */
"        movl    (%%ecx,%%eax,4), %%eax\n"/* eax = dcode[hold & dmask] */

".L_dodist:\n"
"        movl    %%eax, %%ebp\n"          /* dist = this */
"        shrl    $16, %%ebp\n"            /* dist = this.val */
"        movb    %%ah, %%cl\n"
"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
"        shrl    %%cl, %%edx\n"           /* hold >>= this.bits */
"        movb    %%al, %%cl\n"            /* cl = this.op */

"        testb   $16, %%al\n"             /* if ((op & 16) == 0) */
"        jz      .L_test_for_second_level_dist\n"
"        andb    $15, %%cl\n"             /* op &= 15 */
"        jz      .L_check_dist_one\n"
"        cmpb    %%cl, %%bl\n"
"        jae     .L_add_bits_to_dist\n"   /* if (op <= bits) 97.6% */

"        movb    %%cl, %%ch\n"            /* stash op in ch, freeing cl */
"        xorl    %%eax, %%eax\n"
"        lodsw\n"                         /* al = *(ushort *)in++ */
"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
"        addb    $16, %%bl\n"             /* bits += 16 */
"        shll    %%cl, %%eax\n"
"        orl     %%eax, %%edx\n"        /* hold |= *((ushort *)in)++ << bits */
"        movb    %%ch, %%cl\n"            /* move op back to ecx */

".L_add_bits_to_dist:\n"
"        subb    %%cl, %%bl\n"
"        xorl    %%eax, %%eax\n"
"        incl    %%eax\n"
"        shll    %%cl, %%eax\n"
"        decl    %%eax\n"                 /* (1 << op) - 1 */
"        andl    %%edx, %%eax\n"          /* eax &= hold */
"        shrl    %%cl, %%edx\n"
"        addl    %%eax, %%ebp\n"          /* dist += hold & ((1 << op) - 1) */

".L_check_window:\n"
"        movl    %%esi, 8(%%esp)\n"       /* save in so from can use it's reg */
"        movl    %%edi, %%eax\n"
"        subl    20(%%esp), %%eax\n"      /* nbytes = out - beg */

"        cmpl    %%ebp, %%eax\n"
"        jb      .L_clip_window\n"        /* if (dist > nbytes) 4.2% */

"        movl    64(%%esp), %%ecx\n"      /* ecx = len */
"        movl    %%edi, %%esi\n"
"        subl    %%ebp, %%esi\n"          /* from = out - dist */

"        sarl    %%ecx\n"
"        jnc     .L_copy_two\n"           /* if len % 2 == 0 */

"        rep     movsw\n"
"        movb    (%%esi), %%al\n"
"        movb    %%al, (%%edi)\n"
"        incl    %%edi\n"

"        movl    8(%%esp), %%esi\n"       /* move in back to %esi, toss from */
"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
"        jmp     .L_while_test\n"

".L_copy_two:\n"
"        rep     movsw\n"
"        movl    8(%%esp), %%esi\n"       /* move in back to %esi, toss from */
"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
"        jmp     .L_while_test\n"

".align 32,0x90\n"
".L_check_dist_one:\n"
"        cmpl    $1, %%ebp\n"            /* if dist 1, is a memset */
"        jne     .L_check_window\n"
"        cmpl    %%edi, 20(%%esp)\n"
"        je      .L_check_window\n"      /* out == beg, if outside window */

"        movl    64(%%esp), %%ecx\n"      /* ecx = len */
"        movb    -1(%%edi), %%al\n"
"        movb    %%al, %%ah\n"

"        sarl    %%ecx\n"
"        jnc     .L_set_two\n"
"        movb    %%al, (%%edi)\n"
"        incl    %%edi\n"

".L_set_two:\n"
"        rep     stosw\n"
"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
"        jmp     .L_while_test\n"

".align 32,0x90\n"
".L_test_for_second_level_length:\n"
"        testb   $64, %%al\n"
"        jnz     .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */

"        xorl    %%eax, %%eax\n"
"        incl    %%eax\n"
"        shll    %%cl, %%eax\n"
"        decl    %%eax\n"
"        andl    %%edx, %%eax\n"         /* eax &= hold */
"        addl    64(%%esp), %%eax\n"     /* eax += len */
"        movl    (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/
"        jmp     .L_dolen\n"

".align 32,0x90\n"
".L_test_for_second_level_dist:\n"
"        testb   $64, %%al\n"
"        jnz     .L_invalid_distance_code\n" /* if ((op & 64) != 0) */

"        xorl    %%eax, %%eax\n"
"        incl    %%eax\n"
"        shll    %%cl, %%eax\n"
"        decl    %%eax\n"
"        andl    %%edx, %%eax\n"         /* eax &= hold */
"        addl    %%ebp, %%eax\n"         /* eax += dist */
"        movl    36(%%esp), %%ecx\n"     /* ecx = dcode */
"        movl    (%%ecx,%%eax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/
"        jmp     .L_dodist\n"

".align 32,0x90\n"
".L_clip_window:\n"
"        movl    %%eax, %%ecx\n"
"        movl    48(%%esp), %%eax\n"     /* eax = wsize */
"        negl    %%ecx\n"                /* nbytes = -nbytes */
"        movl    28(%%esp), %%esi\n"     /* from = window */

"        cmpl    %%ebp, %%eax\n"
"        jb      .L_invalid_distance_too_far\n" /* if (dist > wsize) */

"        addl    %%ebp, %%ecx\n"         /* nbytes = dist - nbytes */
"        cmpl    $0, 52(%%esp)\n"
"        jne     .L_wrap_around_window\n" /* if (write != 0) */

"        subl    %%ecx, %%eax\n"
"        addl    %%eax, %%esi\n"         /* from += wsize - nbytes */

"        movl    64(%%esp), %%eax\n"     /* eax = len */
"        cmpl    %%ecx, %%eax\n"
"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */

"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
"        rep     movsb\n"
"        movl    %%edi, %%esi\n"
"        subl    %%ebp, %%esi\n"         /* from = out - dist */
"        jmp     .L_do_copy\n"

".align 32,0x90\n"
".L_wrap_around_window:\n"
"        movl    52(%%esp), %%eax\n"     /* eax = write */
"        cmpl    %%eax, %%ecx\n"
"        jbe     .L_contiguous_in_window\n" /* if (write >= nbytes) */

"        addl    48(%%esp), %%esi\n"     /* from += wsize */
"        addl    %%eax, %%esi\n"         /* from += write */
"        subl    %%ecx, %%esi\n"         /* from -= nbytes */
"        subl    %%eax, %%ecx\n"         /* nbytes -= write */

"        movl    64(%%esp), %%eax\n"     /* eax = len */
"        cmpl    %%ecx, %%eax\n"
"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */

"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
"        rep     movsb\n"
"        movl    28(%%esp), %%esi\n"     /* from = window */
"        movl    52(%%esp), %%ecx\n"     /* nbytes = write */
"        cmpl    %%ecx, %%eax\n"
"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */

"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
"        rep     movsb\n"
"        movl    %%edi, %%esi\n"
"        subl    %%ebp, %%esi\n"         /* from = out - dist */
"        jmp     .L_do_copy\n"

".align 32,0x90\n"
".L_contiguous_in_window:\n"
"        addl    %%eax, %%esi\n"
"        subl    %%ecx, %%esi\n"         /* from += write - nbytes */

"        movl    64(%%esp), %%eax\n"     /* eax = len */
"        cmpl    %%ecx, %%eax\n"
"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */

"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
"        rep     movsb\n"
"        movl    %%edi, %%esi\n"
"        subl    %%ebp, %%esi\n"         /* from = out - dist */
"        jmp     .L_do_copy\n"           /* if (nbytes >= len) */

".align 32,0x90\n"
".L_do_copy:\n"
"        movl    %%eax, %%ecx\n"
"        rep     movsb\n"

"        movl    8(%%esp), %%esi\n"      /* move in back to %esi, toss from */
"        movl    32(%%esp), %%ebp\n"     /* ebp = lcode */
"        jmp     .L_while_test\n"

".L_test_for_end_of_block:\n"
"        testb   $32, %%al\n"
"        jz      .L_invalid_literal_length_code\n"
"        movl    $1, 72(%%esp)\n"
"        jmp     .L_break_loop_with_status\n"

".L_invalid_literal_length_code:\n"
"        movl    $2, 72(%%esp)\n"
"        jmp     .L_break_loop_with_status\n"

".L_invalid_distance_code:\n"
"        movl    $3, 72(%%esp)\n"
"        jmp     .L_break_loop_with_status\n"

".L_invalid_distance_too_far:\n"
"        movl    8(%%esp), %%esi\n"
"        movl    $4, 72(%%esp)\n"
"        jmp     .L_break_loop_with_status\n"

".L_break_loop:\n"
"        movl    $0, 72(%%esp)\n"

".L_break_loop_with_status:\n"
/* put in, out, bits, and hold back into ar and pop esp */
"        movl    %%esi, 8(%%esp)\n"      /* save in */
"        movl    %%edi, 16(%%esp)\n"     /* save out */
"        movl    %%ebx, 44(%%esp)\n"     /* save bits */
"        movl    %%edx, 40(%%esp)\n"     /* save hold */
"        movl    4(%%esp), %%ebp\n"      /* restore esp, ebp */
"        movl    (%%esp), %%esp\n"
          :
          : "m" (ar)
          : "memory", "%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi"
    );
#elif defined( _MSC_VER ) && ! defined( _M_AMD64 )
    __asm {
	lea	eax, ar
	mov	[eax], esp         /* save esp, ebp */
	mov	[eax+4], ebp
	mov	esp, eax
	mov	esi, [esp+8]       /* esi = in */
	mov	edi, [esp+16]      /* edi = out */
	mov	edx, [esp+40]      /* edx = hold */
	mov	ebx, [esp+44]      /* ebx = bits */
	mov	ebp, [esp+32]      /* ebp = lcode */

	cld
	jmp	L_do_loop

ALIGN 4
L_while_test:
	cmp	[esp+24], edi
	jbe	L_break_loop
	cmp	[esp+12], esi
	jbe	L_break_loop

L_do_loop:
	cmp	bl, 15
	ja	L_get_length_code    /* if (15 < bits) */

	xor	eax, eax
	lodsw                         /* al = *(ushort *)in++ */
	mov	cl, bl            /* cl = bits, needs it for shifting */
	add	bl, 16             /* bits += 16 */
	shl	eax, cl
	or	edx, eax        /* hold |= *((ushort *)in)++ << bits */

L_get_length_code:
	mov	eax, [esp+56]      /* eax = lmask */
	and	eax, edx          /* eax &= hold */
	mov	eax, [ebp+eax*4] /* eax = lcode[hold & lmask] */

L_dolen:
	mov	cl, ah            /* cl = this.bits */
	sub	bl, ah            /* bits -= this.bits */
	shr	edx, cl           /* hold >>= this.bits */

	test	al, al
	jnz	L_test_for_length_base /* if (op != 0) 45.7% */

	shr	eax, 16            /* output this.val char */
	stosb
	jmp	L_while_test

ALIGN 4
L_test_for_length_base:
	mov	ecx, eax          /* len = this */
	shr	ecx, 16            /* len = this.val */
	mov	[esp+64], ecx      /* save len */
	mov	cl, al

	test	al, 16
	jz	L_test_for_second_level_length /* if ((op & 16) == 0) 8% */
	and	cl, 15             /* op &= 15 */
	jz	L_decode_distance    /* if (!op) */
	cmp	bl, cl
	jae	L_add_bits_to_len    /* if (op <= bits) */

	mov	ch, cl            /* stash op in ch, freeing cl */
	xor	eax, eax
	lodsw                         /* al = *(ushort *)in++ */
	mov	cl, bl            /* cl = bits, needs it for shifting */
	add	bl, 16             /* bits += 16 */
	shl	eax, cl
	or	edx, eax         /* hold |= *((ushort *)in)++ << bits */
	mov	cl, ch            /* move op back to ecx */

L_add_bits_to_len:
	sub	bl, cl
	xor	eax, eax
	inc	eax
	shl	eax, cl
	dec	eax
	and	eax, edx          /* eax &= hold */
	shr	edx, cl
	add	[esp+64], eax      /* len += hold & mask[op] */

L_decode_distance:
	cmp	bl, 15
	ja	L_get_distance_code  /* if (15 < bits) */

	xor	eax, eax
	lodsw                         /* al = *(ushort *)in++ */
	mov	cl, bl            /* cl = bits, needs it for shifting */
	add	bl, 16             /* bits += 16 */
	shl	eax, cl
	or	edx, eax         /* hold |= *((ushort *)in)++ << bits */

L_get_distance_code:
	mov	eax, [esp+60]      /* eax = dmask */
	mov	ecx, [esp+36]      /* ecx = dcode */
	and	eax, edx          /* eax &= hold */
	mov	eax, [ecx+eax*4]/* eax = dcode[hold & dmask] */

L_dodist:
	mov	ebp, eax          /* dist = this */
	shr	ebp, 16            /* dist = this.val */
	mov	cl, ah
	sub	bl, ah            /* bits -= this.bits */
	shr	edx, cl           /* hold >>= this.bits */
	mov	cl, al            /* cl = this.op */

	test	al, 16             /* if ((op & 16) == 0) */
	jz	L_test_for_second_level_dist
	and	cl, 15             /* op &= 15 */
	jz	L_check_dist_one
	cmp	bl, cl
	jae	L_add_bits_to_dist   /* if (op <= bits) 97.6% */

	mov	ch, cl            /* stash op in ch, freeing cl */
	xor	eax, eax
	lodsw                         /* al = *(ushort *)in++ */
	mov	cl, bl            /* cl = bits, needs it for shifting */
	add	bl, 16             /* bits += 16 */
	shl	eax, cl
	or	edx, eax        /* hold |= *((ushort *)in)++ << bits */
	mov	cl, ch            /* move op back to ecx */

L_add_bits_to_dist:
	sub	bl, cl
	xor	eax, eax
	inc	eax
	shl	eax, cl
	dec	eax                 /* (1 << op) - 1 */
	and	eax, edx          /* eax &= hold */
	shr	edx, cl
	add	ebp, eax          /* dist += hold & ((1 << op) - 1) */

L_check_window:
	mov	[esp+8], esi       /* save in so from can use it's reg */
	mov	eax, edi
	sub	eax, [esp+20]      /* nbytes = out - beg */

	cmp	eax, ebp
	jb	L_clip_window        /* if (dist > nbytes) 4.2% */

	mov	ecx, [esp+64]      /* ecx = len */
	mov	esi, edi
	sub	esi, ebp          /* from = out - dist */

	sar	ecx, 1
	jnc	L_copy_two

	rep     movsw
	mov	al, [esi]
	mov	[edi], al
	inc	edi

	mov	esi, [esp+8]      /* move in back to %esi, toss from */
	mov	ebp, [esp+32]     /* ebp = lcode */
	jmp	L_while_test

L_copy_two:
	rep     movsw
	mov	esi, [esp+8]      /* move in back to %esi, toss from */
	mov	ebp, [esp+32]     /* ebp = lcode */
	jmp	L_while_test

ALIGN 4
L_check_dist_one:
	cmp	ebp, 1            /* if dist 1, is a memset */
	jne	L_check_window
	cmp	[esp+20], edi
	je	L_check_window    /* out == beg, if outside window */

	mov	ecx, [esp+64]     /* ecx = len */
	mov	al, [edi-1]
	mov	ah, al

	sar	ecx, 1
	jnc	L_set_two
	mov	[edi], al         /* memset out with from[-1] */
	inc	edi

L_set_two:
	rep     stosw
	mov	ebp, [esp+32]     /* ebp = lcode */
	jmp	L_while_test

ALIGN 4
L_test_for_second_level_length:
	test	al, 64
	jnz	L_test_for_end_of_block /* if ((op & 64) != 0) */

	xor	eax, eax
	inc	eax
	shl	eax, cl
	dec	eax
	and	eax, edx         /* eax &= hold */
	add	eax, [esp+64]     /* eax += len */
	mov	eax, [ebp+eax*4] /* eax = lcode[val+(hold&mask[op])]*/
	jmp	L_dolen

ALIGN 4
L_test_for_second_level_dist:
	test	al, 64
	jnz	L_invalid_distance_code /* if ((op & 64) != 0) */

	xor	eax, eax
	inc	eax
	shl	eax, cl
	dec	eax
	and	eax, edx         /* eax &= hold */
	add	eax, ebp         /* eax += dist */
	mov	ecx, [esp+36]     /* ecx = dcode */
	mov	eax, [ecx+eax*4] /* eax = dcode[val+(hold&mask[op])]*/
	jmp	L_dodist

ALIGN 4
L_clip_window:
	mov	ecx, eax
	mov	eax, [esp+48]     /* eax = wsize */
	neg	ecx                /* nbytes = -nbytes */
	mov	esi, [esp+28]     /* from = window */

	cmp	eax, ebp
	jb	L_invalid_distance_too_far /* if (dist > wsize) */

	add	ecx, ebp         /* nbytes = dist - nbytes */
	cmp	dword ptr [esp+52], 0
	jne	L_wrap_around_window /* if (write != 0) */

	sub	eax, ecx
	add	esi, eax         /* from += wsize - nbytes */

	mov	eax, [esp+64]    /* eax = len */
	cmp	eax, ecx
	jbe	L_do_copy          /* if (nbytes >= len) */

	sub	eax, ecx         /* len -= nbytes */
	rep     movsb
	mov	esi, edi
	sub	esi, ebp         /* from = out - dist */
	jmp	L_do_copy

ALIGN 4
L_wrap_around_window:
	mov	eax, [esp+52]    /* eax = write */
	cmp	ecx, eax
	jbe	L_contiguous_in_window /* if (write >= nbytes) */

	add	esi, [esp+48]    /* from += wsize */
	add	esi, eax         /* from += write */
	sub	esi, ecx         /* from -= nbytes */
	sub	ecx, eax         /* nbytes -= write */

	mov	eax, [esp+64]    /* eax = len */
	cmp	eax, ecx
	jbe	L_do_copy          /* if (nbytes >= len) */

	sub	eax, ecx         /* len -= nbytes */
	rep     movsb
	mov	esi, [esp+28]     /* from = window */
	mov	ecx, [esp+52]     /* nbytes = write */
	cmp	eax, ecx
	jbe	L_do_copy          /* if (nbytes >= len) */

	sub	eax, ecx         /* len -= nbytes */
	rep     movsb
	mov	esi, edi
	sub	esi, ebp         /* from = out - dist */
	jmp	L_do_copy

ALIGN 4
L_contiguous_in_window:
	add	esi, eax
	sub	esi, ecx         /* from += write - nbytes */

	mov	eax, [esp+64]    /* eax = len */
	cmp	eax, ecx
	jbe	L_do_copy          /* if (nbytes >= len) */

	sub	eax, ecx         /* len -= nbytes */
	rep     movsb
	mov	esi, edi
	sub	esi, ebp         /* from = out - dist */
	jmp	L_do_copy

ALIGN 4
L_do_copy:
	mov	ecx, eax
	rep     movsb

	mov	esi, [esp+8]      /* move in back to %esi, toss from */
	mov	ebp, [esp+32]     /* ebp = lcode */
	jmp	L_while_test

L_test_for_end_of_block:
	test	al, 32
	jz	L_invalid_literal_length_code
	mov	dword ptr [esp+72], 1
	jmp	L_break_loop_with_status

L_invalid_literal_length_code:
	mov	dword ptr [esp+72], 2
	jmp	L_break_loop_with_status

L_invalid_distance_code:
	mov	dword ptr [esp+72], 3
	jmp	L_break_loop_with_status

L_invalid_distance_too_far:
	mov	esi, [esp+4]
	mov	dword ptr [esp+72], 4
	jmp	L_break_loop_with_status

L_break_loop:
	mov	dword ptr [esp+72], 0

L_break_loop_with_status:
/* put in, out, bits, and hold back into ar and pop esp */
	mov	[esp+8], esi     /* save in */
	mov	[esp+16], edi    /* save out */
	mov	[esp+44], ebx    /* save bits */
	mov	[esp+40], edx    /* save hold */
	mov	ebp, [esp+4]     /* restore esp, ebp */
	mov	esp, [esp]
    }
#else
#error "x86 architecture not defined"
#endif

    if (ar.status > 1) {
        if (ar.status == 2)
            strm->msg = "invalid literal/length code";
        else if (ar.status == 3)
            strm->msg = "invalid distance code";
        else
            strm->msg = "invalid distance too far back";
        state->mode = BAD;
    }
    else if ( ar.status == 1 ) {
        state->mode = TYPE;
    }

    /* return unused bytes (on entry, bits < 8, so in won't go too far back) */
    ar.len = ar.bits >> 3;
    ar.in -= ar.len;
    ar.bits -= ar.len << 3;
    ar.hold &= (1U << ar.bits) - 1;

    /* update state and return */
    strm->next_in = ar.in;
    strm->next_out = ar.out;
    strm->avail_in = (unsigned)(ar.in < ar.last ?
                                PAD_AVAIL_IN + (ar.last - ar.in) :
                                PAD_AVAIL_IN - (ar.in - ar.last));
    strm->avail_out = (unsigned)(ar.out < ar.end ?
                                 PAD_AVAIL_OUT + (ar.end - ar.out) :
                                 PAD_AVAIL_OUT - (ar.out - ar.end));
    state->hold = ar.hold;
    state->bits = ar.bits;
    return;
}