summaryrefslogtreecommitdiff
path: root/source4/lib/zlib/contrib/inflate86/inffast.S
blob: 2245a2905bdf53083544015620345a175c4fdf64 (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
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
/*
 * inffast.S 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.
 *
 * This version (Jan-23-2003) of inflate_fast was coded and tested under
 * GNU/Linux on a pentium 3, using the gcc-3.2 compiler distribution.  On that
 * machine, I found that gzip style archives decompressed about 20% faster than
 * the gcc-3.2 -O3 -fomit-frame-pointer compiled version.  Your results will
 * depend on how large of a buffer is used for z_stream.next_in & next_out
 * (8K-32K worked best for my 256K cpu cache) and how much overhead there is in
 * stream processing I/O and crc32/addler32.  In my case, this routine used
 * 70% of the cpu time and crc32 used 20%.
 *
 * I am confident that this version will work in the general case, but I have
 * not tested a wide variety of datasets or a wide variety of platforms.
 *
 * Jan-24-2003 -- Added -DUSE_MMX define for slightly faster inflating.
 * It should be a runtime flag instead of compile time flag...
 *
 * Jan-26-2003 -- Added runtime check for MMX support with cpuid instruction.
 * With -DUSE_MMX, only MMX code is compiled.  With -DNO_MMX, only non-MMX code
 * is compiled.  Without either option, runtime detection is enabled.  Runtime
 * detection should work on all modern cpus and the recomended algorithm (flip
 * ID bit on eflags and then use the cpuid instruction) is used in many
 * multimedia applications.  Tested under win2k with gcc-2.95 and gas-2.12
 * distributed with cygwin3.  Compiling with gcc-2.95 -c inffast.S -o
 * inffast.obj generates a COFF object which can then be linked with MSVC++
 * compiled code.  Tested under FreeBSD 4.7 with gcc-2.95.
 *
 * Jan-28-2003 -- Tested Athlon XP... MMX mode is slower than no MMX (and
 * slower than compiler generated code).  Adjusted cpuid check to use the MMX
 * code only for Pentiums < P4 until I have more data on the P4.  Speed
 * improvment is only about 15% on the Athlon when compared with code generated
 * with MSVC++.  Not sure yet, but I think the P4 will also be slower using the
 * MMX mode because many of it's x86 ALU instructions execute in .5 cycles and
 * have less latency than MMX ops.  Added code to buffer the last 11 bytes of
 * the input stream since the MMX code grabs bits in chunks of 32, which
 * differs from the inffast.c algorithm.  I don't think there would have been
 * read overruns where a page boundary was crossed (a segfault), but there
 * could have been overruns when next_in ends on unaligned memory (unintialized
 * memory read).
 *
 * Mar-13-2003 -- P4 MMX is slightly slower than P4 NO_MMX.  I created a C
 * version of the non-MMX code so that it doesn't depend on zstrm and zstate
 * structure offsets which are hard coded in this file.  This was last tested
 * with zlib-1.2.0 which is currently in beta testing, newer versions of this
 * and inffas86.c can be found at http://www.eetbeetee.com/zlib/ and
 * http://www.charm.net/~christop/zlib/
 */


/*
 * if you have underscore linking problems (_inflate_fast undefined), try
 * using -DGAS_COFF
 */
#if ! defined( GAS_COFF ) && ! defined( GAS_ELF )

#if defined( WIN32 ) || defined( __CYGWIN__ )
#define GAS_COFF /* windows object format */
#else
#define GAS_ELF
#endif

#endif /* ! GAS_COFF && ! GAS_ELF */


#if defined( GAS_COFF )

/* coff externals have underscores */
#define inflate_fast _inflate_fast
#define inflate_fast_use_mmx _inflate_fast_use_mmx

#endif /* GAS_COFF */


.file "inffast.S"

.globl inflate_fast

.text
.align 4,0
.L_invalid_literal_length_code_msg:
.string "invalid literal/length code"

.align 4,0
.L_invalid_distance_code_msg:
.string "invalid distance code"

.align 4,0
.L_invalid_distance_too_far_msg:
.string "invalid distance too far back"

#if ! defined( NO_MMX )
.align 4,0
.L_mask: /* mask[N] = ( 1 << N ) - 1 */
.long 0
.long 1
.long 3
.long 7
.long 15
.long 31
.long 63
.long 127
.long 255
.long 511
.long 1023
.long 2047
.long 4095
.long 8191
.long 16383
.long 32767
.long 65535
.long 131071
.long 262143
.long 524287
.long 1048575
.long 2097151
.long 4194303
.long 8388607
.long 16777215
.long 33554431
.long 67108863
.long 134217727
.long 268435455
.long 536870911
.long 1073741823
.long 2147483647
.long 4294967295
#endif /* NO_MMX */

.text

/*
 * struct z_stream offsets, in zlib.h
 */
#define next_in_strm   0   /* strm->next_in */
#define avail_in_strm  4   /* strm->avail_in */
#define next_out_strm  12  /* strm->next_out */
#define avail_out_strm 16  /* strm->avail_out */
#define msg_strm       24  /* strm->msg */
#define state_strm     28  /* strm->state */

/*
 * struct inflate_state offsets, in inflate.h
 */
#define mode_state     0   /* state->mode */
#define wsize_state    32  /* state->wsize */
#define write_state    40  /* state->write */
#define window_state   44  /* state->window */
#define hold_state     48  /* state->hold */
#define bits_state     52  /* state->bits */
#define lencode_state  68  /* state->lencode */
#define distcode_state 72  /* state->distcode */
#define lenbits_state  76  /* state->lenbits */
#define distbits_state 80  /* state->distbits */

/*
 * inflate_fast's activation record
 */
#define local_var_size 64 /* how much local space for vars */
#define strm_sp        88 /* first arg: z_stream * (local_var_size + 24) */
#define start_sp       92 /* second arg: unsigned int (local_var_size + 28) */

/*
 * offsets for local vars on stack
 */
#define out            60  /* unsigned char* */
#define window         56  /* unsigned char* */
#define wsize          52  /* unsigned int */
#define write          48  /* unsigned int */
#define in             44  /* unsigned char* */
#define beg            40  /* unsigned char* */
#define buf            28  /* char[ 12 ] */
#define len            24  /* unsigned int */
#define last           20  /* unsigned char* */
#define end            16  /* unsigned char* */
#define dcode          12  /* code* */
#define lcode           8  /* code* */
#define dmask           4  /* unsigned int */
#define lmask           0  /* unsigned int */

/*
 * typedef enum inflate_mode consts, in inflate.h
 */
#define INFLATE_MODE_TYPE 11  /* state->mode flags enum-ed in inflate.h */
#define INFLATE_MODE_BAD  26


#if ! defined( USE_MMX ) && ! defined( NO_MMX )

#define RUN_TIME_MMX

#define CHECK_MMX    1
#define DO_USE_MMX   2
#define DONT_USE_MMX 3

.globl inflate_fast_use_mmx

.data

.align 4,0
inflate_fast_use_mmx: /* integer flag for run time control 1=check,2=mmx,3=no */
.long CHECK_MMX

#if defined( GAS_ELF )
/* elf info */
.type   inflate_fast_use_mmx,@object
.size   inflate_fast_use_mmx,4
#endif

#endif /* RUN_TIME_MMX */

#if defined( GAS_COFF )
/* coff info: scl 2 = extern, type 32 = function */
.def inflate_fast; .scl 2; .type 32; .endef
#endif

.text

.align 32,0x90
inflate_fast:
        pushl   %edi
        pushl   %esi
        pushl   %ebp
        pushl   %ebx
        pushf   /* save eflags (strm_sp, state_sp assumes this is 32 bits) */
        subl    $local_var_size, %esp
        cld

#define strm_r  %esi
#define state_r %edi

        movl    strm_sp(%esp), strm_r
        movl    state_strm(strm_r), state_r

        /* in = strm->next_in;
         * out = strm->next_out;
         * last = in + strm->avail_in - 11;
         * beg = out - (start - strm->avail_out);
         * end = out + (strm->avail_out - 257);
         */
        movl    avail_in_strm(strm_r), %edx
        movl    next_in_strm(strm_r), %eax

        addl    %eax, %edx      /* avail_in += next_in */
        subl    $11, %edx       /* avail_in -= 11 */

        movl    %eax, in(%esp)
        movl    %edx, last(%esp)

        movl    start_sp(%esp), %ebp
        movl    avail_out_strm(strm_r), %ecx
        movl    next_out_strm(strm_r), %ebx

        subl    %ecx, %ebp      /* start -= avail_out */
        negl    %ebp            /* start = -start */
        addl    %ebx, %ebp      /* start += next_out */

        subl    $257, %ecx      /* avail_out -= 257 */
        addl    %ebx, %ecx      /* avail_out += out */

        movl    %ebx, out(%esp)
        movl    %ebp, beg(%esp)
        movl    %ecx, end(%esp)

        /* wsize = state->wsize;
         * write = state->write;
         * window = state->window;
         * hold = state->hold;
         * bits = state->bits;
         * lcode = state->lencode;
         * dcode = state->distcode;
         * lmask = ( 1 << state->lenbits ) - 1;
         * dmask = ( 1 << state->distbits ) - 1;
         */

        movl    lencode_state(state_r), %eax
        movl    distcode_state(state_r), %ecx

        movl    %eax, lcode(%esp)
        movl    %ecx, dcode(%esp)

        movl    $1, %eax
        movl    lenbits_state(state_r), %ecx
        shll    %cl, %eax
        decl    %eax
        movl    %eax, lmask(%esp)

        movl    $1, %eax
        movl    distbits_state(state_r), %ecx
        shll    %cl, %eax
        decl    %eax
        movl    %eax, dmask(%esp)

        movl    wsize_state(state_r), %eax
        movl    write_state(state_r), %ecx
        movl    window_state(state_r), %edx

        movl    %eax, wsize(%esp)
        movl    %ecx, write(%esp)
        movl    %edx, window(%esp)

        movl    hold_state(state_r), %ebp
        movl    bits_state(state_r), %ebx

#undef strm_r
#undef state_r

#define in_r       %esi
#define from_r     %esi
#define out_r      %edi

        movl    in(%esp), in_r
        movl    last(%esp), %ecx
        cmpl    in_r, %ecx
        ja      .L_align_long           /* if in < last */

        addl    $11, %ecx               /* ecx = &in[ avail_in ] */
        subl    in_r, %ecx              /* ecx = avail_in */
        movl    $12, %eax
        subl    %ecx, %eax              /* eax = 12 - avail_in */
        leal    buf(%esp), %edi
        rep     movsb                   /* memcpy( buf, in, avail_in ) */
        movl    %eax, %ecx
        xorl    %eax, %eax
        rep     stosb         /* memset( &buf[ avail_in ], 0, 12 - avail_in ) */
        leal    buf(%esp), in_r         /* in = buf */
        movl    in_r, last(%esp)        /* last = in, do just one iteration */
        jmp     .L_is_aligned

        /* align in_r on long boundary */
.L_align_long:
        testl   $3, in_r
        jz      .L_is_aligned
        xorl    %eax, %eax
        movb    (in_r), %al
        incl    in_r
        movl    %ebx, %ecx
        addl    $8, %ebx
        shll    %cl, %eax
        orl     %eax, %ebp
        jmp     .L_align_long

.L_is_aligned:
        movl    out(%esp), out_r

#if defined( NO_MMX )
        jmp     .L_do_loop
#endif

#if defined( USE_MMX )
        jmp     .L_init_mmx
#endif

/*** Runtime MMX check ***/

#if defined( RUN_TIME_MMX )
.L_check_mmx:
        cmpl    $DO_USE_MMX, inflate_fast_use_mmx
        je      .L_init_mmx
        ja      .L_do_loop /* > 2 */

        pushl   %eax
        pushl   %ebx
        pushl   %ecx
        pushl   %edx
        pushf
        movl    (%esp), %eax      /* copy eflags to eax */
        xorl    $0x200000, (%esp) /* try toggling ID bit of eflags (bit 21)
                                   * to see if cpu supports cpuid...
                                   * ID bit method not supported by NexGen but
                                   * bios may load a cpuid instruction and
                                   * cpuid may be disabled on Cyrix 5-6x86 */
        popf
        pushf
        popl    %edx              /* copy new eflags to edx */
        xorl    %eax, %edx        /* test if ID bit is flipped */
        jz      .L_dont_use_mmx   /* not flipped if zero */
        xorl    %eax, %eax
        cpuid
        cmpl    $0x756e6547, %ebx /* check for GenuineIntel in ebx,ecx,edx */
        jne     .L_dont_use_mmx
        cmpl    $0x6c65746e, %ecx
        jne     .L_dont_use_mmx
        cmpl    $0x49656e69, %edx
        jne     .L_dont_use_mmx
        movl    $1, %eax
        cpuid                     /* get cpu features */
        shrl    $8, %eax
        andl    $15, %eax
        cmpl    $6, %eax          /* check for Pentium family, is 0xf for P4 */
        jne     .L_dont_use_mmx
        testl   $0x800000, %edx   /* test if MMX feature is set (bit 23) */
        jnz     .L_use_mmx
        jmp     .L_dont_use_mmx
.L_use_mmx:
        movl    $DO_USE_MMX, inflate_fast_use_mmx
        jmp     .L_check_mmx_pop
.L_dont_use_mmx:
        movl    $DONT_USE_MMX, inflate_fast_use_mmx
.L_check_mmx_pop:
        popl    %edx
        popl    %ecx
        popl    %ebx
        popl    %eax
        jmp     .L_check_mmx
#endif


/*** Non-MMX code ***/

#if defined ( NO_MMX ) || defined( RUN_TIME_MMX )

#define hold_r     %ebp
#define bits_r     %bl
#define bitslong_r %ebx

.align 32,0x90
.L_while_test:
        /* while (in < last && out < end)
         */
        cmpl    out_r, end(%esp)
        jbe     .L_break_loop           /* if (out >= end) */

        cmpl    in_r, last(%esp)
        jbe     .L_break_loop

.L_do_loop:
        /* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out
         *
         * do {
         *   if (bits < 15) {
         *     hold |= *((unsigned short *)in)++ << bits;
         *     bits += 16
         *   }
         *   this = lcode[hold & lmask]
         */
        cmpb    $15, bits_r
        ja      .L_get_length_code      /* if (15 < bits) */

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

.L_get_length_code:
        movl    lmask(%esp), %edx       /* edx = lmask */
        movl    lcode(%esp), %ecx       /* ecx = lcode */
        andl    hold_r, %edx            /* edx &= hold */
        movl    (%ecx,%edx,4), %eax     /* eax = lcode[hold & lmask] */

.L_dolen:
        /* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out
         *
         * dolen:
         *    bits -= this.bits;
         *    hold >>= this.bits
         */
        movb    %ah, %cl                /* cl = this.bits */
        subb    %ah, bits_r             /* bits -= this.bits */
        shrl    %cl, hold_r             /* hold >>= this.bits */

        /* check if op is a literal
         * if (op == 0) {
         *    PUP(out) = this.val;
         *  }
         */
        testb   %al, %al
        jnz     .L_test_for_length_base /* if (op != 0) 45.7% */

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

.L_test_for_length_base:
        /* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out, %edx = len
         *
         * else if (op & 16) {
         *   len = this.val
         *   op &= 15
         *   if (op) {
         *     if (op > bits) {
         *       hold |= *((unsigned short *)in)++ << bits;
         *       bits += 16
         *     }
         *     len += hold & mask[op];
         *     bits -= op;
         *     hold >>= op;
         *   }
         */
#define len_r %edx
        movl    %eax, len_r             /* len = this */
        shrl    $16, len_r              /* len = this.val */
        movb    %al, %cl

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

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

.L_add_bits_to_len:
        movl    $1, %eax
        shll    %cl, %eax
        decl    %eax
        subb    %cl, bits_r
        andl    hold_r, %eax            /* eax &= hold */
        shrl    %cl, hold_r
        addl    %eax, len_r             /* len += hold & mask[op] */

.L_save_len:
        movl    len_r, len(%esp)        /* save len */
#undef  len_r

.L_decode_distance:
        /* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out, %edx = dist
         *
         *   if (bits < 15) {
         *     hold |= *((unsigned short *)in)++ << bits;
         *     bits += 16
         *   }
         *   this = dcode[hold & dmask];
         * dodist:
         *   bits -= this.bits;
         *   hold >>= this.bits;
         *   op = this.op;
         */

        cmpb    $15, bits_r
        ja      .L_get_distance_code    /* if (15 < bits) */

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

.L_get_distance_code:
        movl    dmask(%esp), %edx       /* edx = dmask */
        movl    dcode(%esp), %ecx       /* ecx = dcode */
        andl    hold_r, %edx            /* edx &= hold */
        movl    (%ecx,%edx,4), %eax     /* eax = dcode[hold & dmask] */

#define dist_r %edx
.L_dodist:
        movl    %eax, dist_r            /* dist = this */
        shrl    $16, dist_r             /* dist = this.val */
        movb    %ah, %cl
        subb    %ah, bits_r             /* bits -= this.bits */
        shrl    %cl, hold_r             /* hold >>= this.bits */

        /* if (op & 16) {
         *   dist = this.val
         *   op &= 15
         *   if (op > bits) {
         *     hold |= *((unsigned short *)in)++ << bits;
         *     bits += 16
         *   }
         *   dist += hold & mask[op];
         *   bits -= op;
         *   hold >>= op;
         */
        movb    %al, %cl                /* cl = this.op */

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

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

.L_add_bits_to_dist:
        movl    $1, %eax
        shll    %cl, %eax
        decl    %eax                    /* (1 << op) - 1 */
        subb    %cl, bits_r
        andl    hold_r, %eax            /* eax &= hold */
        shrl    %cl, hold_r
        addl    %eax, dist_r            /* dist += hold & ((1 << op) - 1) */
        jmp     .L_check_window

.L_check_window:
        /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
         *       %ecx = nbytes
         *
         * nbytes = out - beg;
         * if (dist <= nbytes) {
         *   from = out - dist;
         *   do {
         *     PUP(out) = PUP(from);
         *   } while (--len > 0) {
         * }
         */

        movl    in_r, in(%esp)          /* save in so from can use it's reg */
        movl    out_r, %eax
        subl    beg(%esp), %eax         /* nbytes = out - beg */

        cmpl    dist_r, %eax
        jb      .L_clip_window          /* if (dist > nbytes) 4.2% */

        movl    len(%esp), %ecx
        movl    out_r, from_r
        subl    dist_r, from_r          /* from = out - dist */

        subl    $3, %ecx
        movb    (from_r), %al
        movb    %al, (out_r)
        movb    1(from_r), %al
        movb    2(from_r), %dl
        addl    $3, from_r
        movb    %al, 1(out_r)
        movb    %dl, 2(out_r)
        addl    $3, out_r
        rep     movsb

        movl    in(%esp), in_r          /* move in back to %esi, toss from */
        jmp     .L_while_test

.align 16,0x90
.L_check_dist_one:
        cmpl    $1, dist_r
        jne     .L_check_window
        cmpl    out_r, beg(%esp)
        je      .L_check_window

        decl    out_r
        movl    len(%esp), %ecx
        movb    (out_r), %al
        subl    $3, %ecx

        movb    %al, 1(out_r)
        movb    %al, 2(out_r)
        movb    %al, 3(out_r)
        addl    $4, out_r
        rep     stosb

        jmp     .L_while_test

.align 16,0x90
.L_test_for_second_level_length:
        /* else if ((op & 64) == 0) {
         *   this = lcode[this.val + (hold & mask[op])];
         * }
         */
        testb   $64, %al
        jnz     .L_test_for_end_of_block  /* if ((op & 64) != 0) */

        movl    $1, %eax
        shll    %cl, %eax
        decl    %eax
        andl    hold_r, %eax            /* eax &= hold */
        addl    %edx, %eax              /* eax += this.val */
        movl    lcode(%esp), %edx       /* edx = lcode */
        movl    (%edx,%eax,4), %eax     /* eax = lcode[val + (hold&mask[op])] */
        jmp     .L_dolen

.align 16,0x90
.L_test_for_second_level_dist:
        /* else if ((op & 64) == 0) {
         *   this = dcode[this.val + (hold & mask[op])];
         * }
         */
        testb   $64, %al
        jnz     .L_invalid_distance_code  /* if ((op & 64) != 0) */

        movl    $1, %eax
        shll    %cl, %eax
        decl    %eax
        andl    hold_r, %eax            /* eax &= hold */
        addl    %edx, %eax              /* eax += this.val */
        movl    dcode(%esp), %edx       /* edx = dcode */
        movl    (%edx,%eax,4), %eax     /* eax = dcode[val + (hold&mask[op])] */
        jmp     .L_dodist

.align 16,0x90
.L_clip_window:
        /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
         *       %ecx = nbytes
         *
         * else {
         *   if (dist > wsize) {
         *     invalid distance
         *   }
         *   from = window;
         *   nbytes = dist - nbytes;
         *   if (write == 0) {
         *     from += wsize - nbytes;
         */
#define nbytes_r %ecx
        movl    %eax, nbytes_r
        movl    wsize(%esp), %eax       /* prepare for dist compare */
        negl    nbytes_r                /* nbytes = -nbytes */
        movl    window(%esp), from_r    /* from = window */

        cmpl    dist_r, %eax
        jb      .L_invalid_distance_too_far /* if (dist > wsize) */

        addl    dist_r, nbytes_r        /* nbytes = dist - nbytes */
        cmpl    $0, write(%esp)
        jne     .L_wrap_around_window   /* if (write != 0) */

        subl    nbytes_r, %eax
        addl    %eax, from_r            /* from += wsize - nbytes */

        /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
         *       %ecx = nbytes, %eax = len
         *
         *     if (nbytes < len) {
         *       len -= nbytes;
         *       do {
         *         PUP(out) = PUP(from);
         *       } while (--nbytes);
         *       from = out - dist;
         *     }
         *   }
         */
#define len_r %eax
        movl    len(%esp), len_r
        cmpl    nbytes_r, len_r
        jbe     .L_do_copy1             /* if (nbytes >= len) */

        subl    nbytes_r, len_r         /* len -= nbytes */
        rep     movsb
        movl    out_r, from_r
        subl    dist_r, from_r          /* from = out - dist */
        jmp     .L_do_copy1

        cmpl    nbytes_r, len_r
        jbe     .L_do_copy1             /* if (nbytes >= len) */

        subl    nbytes_r, len_r         /* len -= nbytes */
        rep     movsb
        movl    out_r, from_r
        subl    dist_r, from_r          /* from = out - dist */
        jmp     .L_do_copy1

.L_wrap_around_window:
        /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
         *       %ecx = nbytes, %eax = write, %eax = len
         *
         *   else if (write < nbytes) {
         *     from += wsize + write - nbytes;
         *     nbytes -= write;
         *     if (nbytes < len) {
         *       len -= nbytes;
         *       do {
         *         PUP(out) = PUP(from);
         *       } while (--nbytes);
         *       from = window;
         *       nbytes = write;
         *       if (nbytes < len) {
         *         len -= nbytes;
         *         do {
         *           PUP(out) = PUP(from);
         *         } while(--nbytes);
         *         from = out - dist;
         *       }
         *     }
         *   }
         */
#define write_r %eax
        movl    write(%esp), write_r
        cmpl    write_r, nbytes_r
        jbe     .L_contiguous_in_window /* if (write >= nbytes) */

        addl    wsize(%esp), from_r
        addl    write_r, from_r
        subl    nbytes_r, from_r        /* from += wsize + write - nbytes */
        subl    write_r, nbytes_r       /* nbytes -= write */
#undef write_r

        movl    len(%esp), len_r
        cmpl    nbytes_r, len_r
        jbe     .L_do_copy1             /* if (nbytes >= len) */

        subl    nbytes_r, len_r         /* len -= nbytes */
        rep     movsb
        movl    window(%esp), from_r    /* from = window */
        movl    write(%esp), nbytes_r   /* nbytes = write */
        cmpl    nbytes_r, len_r
        jbe     .L_do_copy1             /* if (nbytes >= len) */

        subl    nbytes_r, len_r         /* len -= nbytes */
        rep     movsb
        movl    out_r, from_r
        subl    dist_r, from_r          /* from = out - dist */
        jmp     .L_do_copy1

.L_contiguous_in_window:
        /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
         *       %ecx = nbytes, %eax = write, %eax = len
         *
         *   else {
         *     from += write - nbytes;
         *     if (nbytes < len) {
         *       len -= nbytes;
         *       do {
         *         PUP(out) = PUP(from);
         *       } while (--nbytes);
         *       from = out - dist;
         *     }
         *   }
         */
#define write_r %eax
        addl    write_r, from_r
        subl    nbytes_r, from_r        /* from += write - nbytes */
#undef write_r

        movl    len(%esp), len_r
        cmpl    nbytes_r, len_r
        jbe     .L_do_copy1             /* if (nbytes >= len) */

        subl    nbytes_r, len_r         /* len -= nbytes */
        rep     movsb
        movl    out_r, from_r
        subl    dist_r, from_r          /* from = out - dist */

.L_do_copy1:
        /* regs: %esi = from, %esi = in, %ebp = hold, %bl = bits, %edi = out
         *       %eax = len
         *
         *     while (len > 0) {
         *       PUP(out) = PUP(from);
         *       len--;
         *     }
         *   }
         * } while (in < last && out < end);
         */
#undef nbytes_r
#define in_r %esi
        movl    len_r, %ecx
        rep     movsb

        movl    in(%esp), in_r          /* move in back to %esi, toss from */
        jmp     .L_while_test

#undef len_r
#undef dist_r

#endif /* NO_MMX || RUN_TIME_MMX */


/*** MMX code ***/

#if defined( USE_MMX ) || defined( RUN_TIME_MMX )

.align 32,0x90
.L_init_mmx:
        emms

#undef  bits_r
#undef  bitslong_r
#define bitslong_r %ebp
#define hold_mm    %mm0
        movd    %ebp, hold_mm
        movl    %ebx, bitslong_r

#define used_mm   %mm1
#define dmask2_mm %mm2
#define lmask2_mm %mm3
#define lmask_mm  %mm4
#define dmask_mm  %mm5
#define tmp_mm    %mm6

        movd    lmask(%esp), lmask_mm
        movq    lmask_mm, lmask2_mm
        movd    dmask(%esp), dmask_mm
        movq    dmask_mm, dmask2_mm
        pxor    used_mm, used_mm
        movl    lcode(%esp), %ebx       /* ebx = lcode */
        jmp     .L_do_loop_mmx

.align 32,0x90
.L_while_test_mmx:
        /* while (in < last && out < end)
         */
        cmpl    out_r, end(%esp)
        jbe     .L_break_loop           /* if (out >= end) */

        cmpl    in_r, last(%esp)
        jbe     .L_break_loop

.L_do_loop_mmx:
        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */

        cmpl    $32, bitslong_r
        ja      .L_get_length_code_mmx  /* if (32 < bits) */

        movd    bitslong_r, tmp_mm
        movd    (in_r), %mm7
        addl    $4, in_r
        psllq   tmp_mm, %mm7
        addl    $32, bitslong_r
        por     %mm7, hold_mm           /* hold_mm |= *((uint *)in)++ << bits */

.L_get_length_code_mmx:
        pand    hold_mm, lmask_mm
        movd    lmask_mm, %eax
        movq    lmask2_mm, lmask_mm
        movl    (%ebx,%eax,4), %eax     /* eax = lcode[hold & lmask] */

.L_dolen_mmx:
        movzbl  %ah, %ecx               /* ecx = this.bits */
        movd    %ecx, used_mm
        subl    %ecx, bitslong_r        /* bits -= this.bits */

        testb   %al, %al
        jnz     .L_test_for_length_base_mmx /* if (op != 0) 45.7% */

        shrl    $16, %eax               /* output this.val char */
        stosb
        jmp     .L_while_test_mmx

.L_test_for_length_base_mmx:
#define len_r  %edx
        movl    %eax, len_r             /* len = this */
        shrl    $16, len_r              /* len = this.val */

        testb   $16, %al
        jz      .L_test_for_second_level_length_mmx /* if ((op & 16) == 0) 8% */
        andl    $15, %eax               /* op &= 15 */
        jz      .L_decode_distance_mmx  /* if (!op) */

        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
        movd    %eax, used_mm
        movd    hold_mm, %ecx
        subl    %eax, bitslong_r
        andl    .L_mask(,%eax,4), %ecx
        addl    %ecx, len_r             /* len += hold & mask[op] */

.L_decode_distance_mmx:
        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */

        cmpl    $32, bitslong_r
        ja      .L_get_dist_code_mmx    /* if (32 < bits) */

        movd    bitslong_r, tmp_mm
        movd    (in_r), %mm7
        addl    $4, in_r
        psllq   tmp_mm, %mm7
        addl    $32, bitslong_r
        por     %mm7, hold_mm           /* hold_mm |= *((uint *)in)++ << bits */

.L_get_dist_code_mmx:
        movl    dcode(%esp), %ebx       /* ebx = dcode */
        pand    hold_mm, dmask_mm
        movd    dmask_mm, %eax
        movq    dmask2_mm, dmask_mm
        movl    (%ebx,%eax,4), %eax     /* eax = dcode[hold & lmask] */

.L_dodist_mmx:
#define dist_r %ebx
        movzbl  %ah, %ecx               /* ecx = this.bits */
        movl    %eax, dist_r
        shrl    $16, dist_r             /* dist  = this.val */
        subl    %ecx, bitslong_r        /* bits -= this.bits */
        movd    %ecx, used_mm

        testb   $16, %al                /* if ((op & 16) == 0) */
        jz      .L_test_for_second_level_dist_mmx
        andl    $15, %eax               /* op &= 15 */
        jz      .L_check_dist_one_mmx

.L_add_bits_to_dist_mmx:
        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
        movd    %eax, used_mm           /* save bit length of current op */
        movd    hold_mm, %ecx           /* get the next bits on input stream */
        subl    %eax, bitslong_r        /* bits -= op bits */
        andl    .L_mask(,%eax,4), %ecx  /* ecx   = hold & mask[op] */
        addl    %ecx, dist_r            /* dist += hold & mask[op] */

.L_check_window_mmx:
        movl    in_r, in(%esp)          /* save in so from can use it's reg */
        movl    out_r, %eax
        subl    beg(%esp), %eax         /* nbytes = out - beg */

        cmpl    dist_r, %eax
        jb      .L_clip_window_mmx      /* if (dist > nbytes) 4.2% */

        movl    len_r, %ecx
        movl    out_r, from_r
        subl    dist_r, from_r          /* from = out - dist */

        subl    $3, %ecx
        movb    (from_r), %al
        movb    %al, (out_r)
        movb    1(from_r), %al
        movb    2(from_r), %dl
        addl    $3, from_r
        movb    %al, 1(out_r)
        movb    %dl, 2(out_r)
        addl    $3, out_r
        rep     movsb

        movl    in(%esp), in_r          /* move in back to %esi, toss from */
        movl    lcode(%esp), %ebx       /* move lcode back to %ebx, toss dist */
        jmp     .L_while_test_mmx

.align 16,0x90
.L_check_dist_one_mmx:
        cmpl    $1, dist_r
        jne     .L_check_window_mmx
        cmpl    out_r, beg(%esp)
        je      .L_check_window_mmx

        decl    out_r
        movl    len_r, %ecx
        movb    (out_r), %al
        subl    $3, %ecx

        movb    %al, 1(out_r)
        movb    %al, 2(out_r)
        movb    %al, 3(out_r)
        addl    $4, out_r
        rep     stosb

        movl    lcode(%esp), %ebx       /* move lcode back to %ebx, toss dist */
        jmp     .L_while_test_mmx

.align 16,0x90
.L_test_for_second_level_length_mmx:
        testb   $64, %al
        jnz     .L_test_for_end_of_block  /* if ((op & 64) != 0) */

        andl    $15, %eax
        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
        movd    hold_mm, %ecx
        andl    .L_mask(,%eax,4), %ecx
        addl    len_r, %ecx
        movl    (%ebx,%ecx,4), %eax     /* eax = lcode[hold & lmask] */
        jmp     .L_dolen_mmx

.align 16,0x90
.L_test_for_second_level_dist_mmx:
        testb   $64, %al
        jnz     .L_invalid_distance_code  /* if ((op & 64) != 0) */

        andl    $15, %eax
        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
        movd    hold_mm, %ecx
        andl    .L_mask(,%eax,4), %ecx
        movl    dcode(%esp), %eax       /* ecx = dcode */
        addl    dist_r, %ecx
        movl    (%eax,%ecx,4), %eax     /* eax = lcode[hold & lmask] */
        jmp     .L_dodist_mmx

.align 16,0x90
.L_clip_window_mmx:
#define nbytes_r %ecx
        movl    %eax, nbytes_r
        movl    wsize(%esp), %eax       /* prepare for dist compare */
        negl    nbytes_r                /* nbytes = -nbytes */
        movl    window(%esp), from_r    /* from = window */

        cmpl    dist_r, %eax
        jb      .L_invalid_distance_too_far /* if (dist > wsize) */

        addl    dist_r, nbytes_r        /* nbytes = dist - nbytes */
        cmpl    $0, write(%esp)
        jne     .L_wrap_around_window_mmx /* if (write != 0) */

        subl    nbytes_r, %eax
        addl    %eax, from_r            /* from += wsize - nbytes */

        cmpl    nbytes_r, len_r
        jbe     .L_do_copy1_mmx         /* if (nbytes >= len) */

        subl    nbytes_r, len_r         /* len -= nbytes */
        rep     movsb
        movl    out_r, from_r
        subl    dist_r, from_r          /* from = out - dist */
        jmp     .L_do_copy1_mmx

        cmpl    nbytes_r, len_r
        jbe     .L_do_copy1_mmx         /* if (nbytes >= len) */

        subl    nbytes_r, len_r         /* len -= nbytes */
        rep     movsb
        movl    out_r, from_r
        subl    dist_r, from_r          /* from = out - dist */
        jmp     .L_do_copy1_mmx

.L_wrap_around_window_mmx:
#define write_r %eax
        movl    write(%esp), write_r
        cmpl    write_r, nbytes_r
        jbe     .L_contiguous_in_window_mmx /* if (write >= nbytes) */

        addl    wsize(%esp), from_r
        addl    write_r, from_r
        subl    nbytes_r, from_r        /* from += wsize + write - nbytes */
        subl    write_r, nbytes_r       /* nbytes -= write */
#undef write_r

        cmpl    nbytes_r, len_r
        jbe     .L_do_copy1_mmx         /* if (nbytes >= len) */

        subl    nbytes_r, len_r         /* len -= nbytes */
        rep     movsb
        movl    window(%esp), from_r    /* from = window */
        movl    write(%esp), nbytes_r   /* nbytes = write */
        cmpl    nbytes_r, len_r
        jbe     .L_do_copy1_mmx         /* if (nbytes >= len) */

        subl    nbytes_r, len_r         /* len -= nbytes */
        rep     movsb
        movl    out_r, from_r
        subl    dist_r, from_r          /* from = out - dist */
        jmp     .L_do_copy1_mmx

.L_contiguous_in_window_mmx:
#define write_r %eax
        addl    write_r, from_r
        subl    nbytes_r, from_r        /* from += write - nbytes */
#undef write_r

        cmpl    nbytes_r, len_r
        jbe     .L_do_copy1_mmx         /* if (nbytes >= len) */

        subl    nbytes_r, len_r         /* len -= nbytes */
        rep     movsb
        movl    out_r, from_r
        subl    dist_r, from_r          /* from = out - dist */

.L_do_copy1_mmx:
#undef nbytes_r
#define in_r %esi
        movl    len_r, %ecx
        rep     movsb

        movl    in(%esp), in_r          /* move in back to %esi, toss from */
        movl    lcode(%esp), %ebx       /* move lcode back to %ebx, toss dist */
        jmp     .L_while_test_mmx

#undef hold_r
#undef bitslong_r

#endif /* USE_MMX || RUN_TIME_MMX */


/*** USE_MMX, NO_MMX, and RUNTIME_MMX from here on ***/

.L_invalid_distance_code:
        /* else {
         *   strm->msg = "invalid distance code";
         *   state->mode = BAD;
         * }
         */
        movl    $.L_invalid_distance_code_msg, %ecx
        movl    $INFLATE_MODE_BAD, %edx
        jmp     .L_update_stream_state

.L_test_for_end_of_block:
        /* else if (op & 32) {
         *   state->mode = TYPE;
         *   break;
         * }
         */
        testb   $32, %al
        jz      .L_invalid_literal_length_code  /* if ((op & 32) == 0) */

        movl    $0, %ecx
        movl    $INFLATE_MODE_TYPE, %edx
        jmp     .L_update_stream_state

.L_invalid_literal_length_code:
        /* else {
         *   strm->msg = "invalid literal/length code";
         *   state->mode = BAD;
         * }
         */
        movl    $.L_invalid_literal_length_code_msg, %ecx
        movl    $INFLATE_MODE_BAD, %edx
        jmp     .L_update_stream_state

.L_invalid_distance_too_far:
        /* strm->msg = "invalid distance too far back";
         * state->mode = BAD;
         */
        movl    in(%esp), in_r          /* from_r has in's reg, put in back */
        movl    $.L_invalid_distance_too_far_msg, %ecx
        movl    $INFLATE_MODE_BAD, %edx
        jmp     .L_update_stream_state

.L_update_stream_state:
        /* set strm->msg = %ecx, strm->state->mode = %edx */
        movl    strm_sp(%esp), %eax
        testl   %ecx, %ecx              /* if (msg != NULL) */
        jz      .L_skip_msg
        movl    %ecx, msg_strm(%eax)    /* strm->msg = msg */
.L_skip_msg:
        movl    state_strm(%eax), %eax  /* state = strm->state */
        movl    %edx, mode_state(%eax)  /* state->mode = edx (BAD | TYPE) */
        jmp     .L_break_loop

.align 32,0x90
.L_break_loop:

/*
 * Regs:
 *
 * bits = %ebp when mmx, and in %ebx when non-mmx
 * hold = %hold_mm when mmx, and in %ebp when non-mmx
 * in   = %esi
 * out  = %edi
 */

#if defined( USE_MMX ) || defined( RUN_TIME_MMX )

#if defined( RUN_TIME_MMX )

        cmpl    $DO_USE_MMX, inflate_fast_use_mmx
        jne     .L_update_next_in

#endif /* RUN_TIME_MMX */

        movl    %ebp, %ebx

.L_update_next_in:

#endif

#define strm_r  %eax
#define state_r %edx

        /* len = bits >> 3;
         * in -= len;
         * bits -= len << 3;
         * hold &= (1U << bits) - 1;
         * state->hold = hold;
         * state->bits = bits;
         * strm->next_in = in;
         * strm->next_out = out;
         */
        movl    strm_sp(%esp), strm_r
        movl    %ebx, %ecx
        movl    state_strm(strm_r), state_r
        shrl    $3, %ecx
        subl    %ecx, in_r
        shll    $3, %ecx
        subl    %ecx, %ebx
        movl    out_r, next_out_strm(strm_r)
        movl    %ebx, bits_state(state_r)
        movl    %ebx, %ecx

        leal    buf(%esp), %ebx
        cmpl    %ebx, last(%esp)
        jne     .L_buf_not_used         /* if buf != last */

        subl    %ebx, in_r              /* in -= buf */
        movl    next_in_strm(strm_r), %ebx
        movl    %ebx, last(%esp)        /* last = strm->next_in */
        addl    %ebx, in_r              /* in += strm->next_in */
        movl    avail_in_strm(strm_r), %ebx
        subl    $11, %ebx
        addl    %ebx, last(%esp)    /* last = &strm->next_in[ avail_in - 11 ] */

.L_buf_not_used:
        movl    in_r, next_in_strm(strm_r)

        movl    $1, %ebx
        shll    %cl, %ebx
        decl    %ebx

#if defined( USE_MMX ) || defined( RUN_TIME_MMX )

#if defined( RUN_TIME_MMX )

        cmpl    $DO_USE_MMX, inflate_fast_use_mmx
        jne     .L_update_hold

#endif /* RUN_TIME_MMX */

        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
        movd    hold_mm, %ebp

        emms

.L_update_hold:

#endif /* USE_MMX || RUN_TIME_MMX */

        andl    %ebx, %ebp
        movl    %ebp, hold_state(state_r)

#define last_r %ebx

        /* strm->avail_in = in < last ? 11 + (last - in) : 11 - (in - last) */
        movl    last(%esp), last_r
        cmpl    in_r, last_r
        jbe     .L_last_is_smaller     /* if (in >= last) */

        subl    in_r, last_r           /* last -= in */
        addl    $11, last_r            /* last += 11 */
        movl    last_r, avail_in_strm(strm_r)
        jmp     .L_fixup_out
.L_last_is_smaller:
        subl    last_r, in_r           /* in -= last */
        negl    in_r                   /* in = -in */
        addl    $11, in_r              /* in += 11 */
        movl    in_r, avail_in_strm(strm_r)

#undef last_r
#define end_r %ebx

.L_fixup_out:
        /* strm->avail_out = out < end ? 257 + (end - out) : 257 - (out - end)*/
        movl    end(%esp), end_r
        cmpl    out_r, end_r
        jbe     .L_end_is_smaller      /* if (out >= end) */

        subl    out_r, end_r           /* end -= out */
        addl    $257, end_r            /* end += 257 */
        movl    end_r, avail_out_strm(strm_r)
        jmp     .L_done
.L_end_is_smaller:
        subl    end_r, out_r           /* out -= end */
        negl    out_r                  /* out = -out */
        addl    $257, out_r            /* out += 257 */
        movl    out_r, avail_out_strm(strm_r)

#undef end_r
#undef strm_r
#undef state_r

.L_done:
        addl    $local_var_size, %esp
        popf
        popl    %ebx
        popl    %ebp
        popl    %esi
        popl    %edi
        ret

#if defined( GAS_ELF )
/* elf info */
.type inflate_fast,@function
.size inflate_fast,.-inflate_fast
#endif