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/StormLib/stormlib/zlib/contrib/inflate86/inffas86.c

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C | 1157 lines | 898 code | 183 blank | 76 comment | 18 complexity | 7e6b7046b068af969d89b4eddff4cd12 MD5 | raw file
   1/* inffas86.c is a hand tuned assembler version of
   2 *
   3 * inffast.c -- fast decoding
   4 * Copyright (C) 1995-2003 Mark Adler
   5 * For conditions of distribution and use, see copyright notice in zlib.h
   6 *
   7 * Copyright (C) 2003 Chris Anderson <christop@charm.net>
   8 * Please use the copyright conditions above.
   9 *
  10 * Dec-29-2003 -- I added AMD64 inflate asm support.  This version is also
  11 * slightly quicker on x86 systems because, instead of using rep movsb to copy
  12 * data, it uses rep movsw, which moves data in 2-byte chunks instead of single
  13 * bytes.  I've tested the AMD64 code on a Fedora Core 1 + the x86_64 updates
  14 * from http://fedora.linux.duke.edu/fc1_x86_64
  15 * which is running on an Athlon 64 3000+ / Gigabyte GA-K8VT800M system with
  16 * 1GB ram.  The 64-bit version is about 4% faster than the 32-bit version,
  17 * when decompressing mozilla-source-1.3.tar.gz.
  18 *
  19 * Mar-13-2003 -- Most of this is derived from inffast.S which is derived from
  20 * the gcc -S output of zlib-1.2.0/inffast.c.  Zlib-1.2.0 is in beta release at
  21 * the moment.  I have successfully compiled and tested this code with gcc2.96,
  22 * gcc3.2, icc5.0, msvc6.0.  It is very close to the speed of inffast.S
  23 * compiled with gcc -DNO_MMX, but inffast.S is still faster on the P3 with MMX
  24 * enabled.  I will attempt to merge the MMX code into this version.  Newer
  25 * versions of this and inffast.S can be found at
  26 * http://www.eetbeetee.com/zlib/ and http://www.charm.net/~christop/zlib/
  27 */
  28
  29#include "zutil.h"
  30#include "inftrees.h"
  31#include "inflate.h"
  32#include "inffast.h"
  33
  34/* Mark Adler's comments from inffast.c: */
  35
  36/*
  37   Decode literal, length, and distance codes and write out the resulting
  38   literal and match bytes until either not enough input or output is
  39   available, an end-of-block is encountered, or a data error is encountered.
  40   When large enough input and output buffers are supplied to inflate(), for
  41   example, a 16K input buffer and a 64K output buffer, more than 95% of the
  42   inflate execution time is spent in this routine.
  43
  44   Entry assumptions:
  45
  46        state->mode == LEN
  47        strm->avail_in >= 6
  48        strm->avail_out >= 258
  49        start >= strm->avail_out
  50        state->bits < 8
  51
  52   On return, state->mode is one of:
  53
  54        LEN -- ran out of enough output space or enough available input
  55        TYPE -- reached end of block code, inflate() to interpret next block
  56        BAD -- error in block data
  57
  58   Notes:
  59
  60    - The maximum input bits used by a length/distance pair is 15 bits for the
  61      length code, 5 bits for the length extra, 15 bits for the distance code,
  62      and 13 bits for the distance extra.  This totals 48 bits, or six bytes.
  63      Therefore if strm->avail_in >= 6, then there is enough input to avoid
  64      checking for available input while decoding.
  65
  66    - The maximum bytes that a single length/distance pair can output is 258
  67      bytes, which is the maximum length that can be coded.  inflate_fast()
  68      requires strm->avail_out >= 258 for each loop to avoid checking for
  69      output space.
  70 */
  71void inflate_fast(strm, start)
  72z_streamp strm;
  73unsigned start;         /* inflate()'s starting value for strm->avail_out */
  74{
  75    struct inflate_state FAR *state;
  76    struct inffast_ar {
  77/* 64   32                               x86  x86_64 */
  78/* ar offset                              register */
  79/*  0    0 */ void *esp;                /* esp save */
  80/*  8    4 */ void *ebp;                /* ebp save */
  81/* 16    8 */ unsigned char FAR *in;    /* esi rsi  local strm->next_in */
  82/* 24   12 */ unsigned char FAR *last;  /*     r9   while in < last */
  83/* 32   16 */ unsigned char FAR *out;   /* edi rdi  local strm->next_out */
  84/* 40   20 */ unsigned char FAR *beg;   /*          inflate()'s init next_out */
  85/* 48   24 */ unsigned char FAR *end;   /*     r10  while out < end */
  86/* 56   28 */ unsigned char FAR *window;/*          size of window, wsize!=0 */
  87/* 64   32 */ code const FAR *lcode;    /* ebp rbp  local strm->lencode */
  88/* 72   36 */ code const FAR *dcode;    /*     r11  local strm->distcode */
  89/* 80   40 */ unsigned long hold;       /* edx rdx  local strm->hold */
  90/* 88   44 */ unsigned bits;            /* ebx rbx  local strm->bits */
  91/* 92   48 */ unsigned wsize;           /*          window size */
  92/* 96   52 */ unsigned write;           /*          window write index */
  93/*100   56 */ unsigned lmask;           /*     r12  mask for lcode */
  94/*104   60 */ unsigned dmask;           /*     r13  mask for dcode */
  95/*108   64 */ unsigned len;             /*     r14  match length */
  96/*112   68 */ unsigned dist;            /*     r15  match distance */
  97/*116   72 */ unsigned status;          /*          set when state chng*/
  98    } ar;
  99
 100#if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )
 101#define PAD_AVAIL_IN 6
 102#define PAD_AVAIL_OUT 258
 103#else
 104#define PAD_AVAIL_IN 5
 105#define PAD_AVAIL_OUT 257
 106#endif
 107
 108    /* copy state to local variables */
 109    state = (struct inflate_state FAR *)strm->state;
 110    ar.in = strm->next_in;
 111    ar.last = ar.in + (strm->avail_in - PAD_AVAIL_IN);
 112    ar.out = strm->next_out;
 113    ar.beg = ar.out - (start - strm->avail_out);
 114    ar.end = ar.out + (strm->avail_out - PAD_AVAIL_OUT);
 115    ar.wsize = state->wsize;
 116    ar.write = state->write;
 117    ar.window = state->window;
 118    ar.hold = state->hold;
 119    ar.bits = state->bits;
 120    ar.lcode = state->lencode;
 121    ar.dcode = state->distcode;
 122    ar.lmask = (1U << state->lenbits) - 1;
 123    ar.dmask = (1U << state->distbits) - 1;
 124
 125    /* decode literals and length/distances until end-of-block or not enough
 126       input data or output space */
 127
 128    /* align in on 1/2 hold size boundary */
 129    while (((unsigned long)(void *)ar.in & (sizeof(ar.hold) / 2 - 1)) != 0) {
 130        ar.hold += (unsigned long)*ar.in++ << ar.bits;
 131        ar.bits += 8;
 132    }
 133
 134#if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )
 135    __asm__ __volatile__ (
 136"        leaq    %0, %%rax\n"
 137"        movq    %%rbp, 8(%%rax)\n"       /* save regs rbp and rsp */
 138"        movq    %%rsp, (%%rax)\n"
 139"        movq    %%rax, %%rsp\n"          /* make rsp point to &ar */
 140"        movq    16(%%rsp), %%rsi\n"      /* rsi  = in */
 141"        movq    32(%%rsp), %%rdi\n"      /* rdi  = out */
 142"        movq    24(%%rsp), %%r9\n"       /* r9   = last */
 143"        movq    48(%%rsp), %%r10\n"      /* r10  = end */
 144"        movq    64(%%rsp), %%rbp\n"      /* rbp  = lcode */
 145"        movq    72(%%rsp), %%r11\n"      /* r11  = dcode */
 146"        movq    80(%%rsp), %%rdx\n"      /* rdx  = hold */
 147"        movl    88(%%rsp), %%ebx\n"      /* ebx  = bits */
 148"        movl    100(%%rsp), %%r12d\n"    /* r12d = lmask */
 149"        movl    104(%%rsp), %%r13d\n"    /* r13d = dmask */
 150                                          /* r14d = len */
 151                                          /* r15d = dist */
 152"        cld\n"
 153"        cmpq    %%rdi, %%r10\n"
 154"        je      .L_one_time\n"           /* if only one decode left */
 155"        cmpq    %%rsi, %%r9\n"
 156"        je      .L_one_time\n"
 157"        jmp     .L_do_loop\n"
 158
 159".L_one_time:\n"
 160"        movq    %%r12, %%r8\n"           /* r8 = lmask */
 161"        cmpb    $32, %%bl\n"
 162"        ja      .L_get_length_code_one_time\n"
 163
 164"        lodsl\n"                         /* eax = *(uint *)in++ */
 165"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
 166"        addb    $32, %%bl\n"             /* bits += 32 */
 167"        shlq    %%cl, %%rax\n"
 168"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */
 169"        jmp     .L_get_length_code_one_time\n"
 170
 171".align 32,0x90\n"
 172".L_while_test:\n"
 173"        cmpq    %%rdi, %%r10\n"
 174"        jbe     .L_break_loop\n"
 175"        cmpq    %%rsi, %%r9\n"
 176"        jbe     .L_break_loop\n"
 177
 178".L_do_loop:\n"
 179"        movq    %%r12, %%r8\n"           /* r8 = lmask */
 180"        cmpb    $32, %%bl\n"
 181"        ja      .L_get_length_code\n"    /* if (32 < bits) */
 182
 183"        lodsl\n"                         /* eax = *(uint *)in++ */
 184"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
 185"        addb    $32, %%bl\n"             /* bits += 32 */
 186"        shlq    %%cl, %%rax\n"
 187"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */
 188
 189".L_get_length_code:\n"
 190"        andq    %%rdx, %%r8\n"            /* r8 &= hold */
 191"        movl    (%%rbp,%%r8,4), %%eax\n"  /* eax = lcode[hold & lmask] */
 192
 193"        movb    %%ah, %%cl\n"            /* cl = this.bits */
 194"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
 195"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */
 196
 197"        testb   %%al, %%al\n"
 198"        jnz     .L_test_for_length_base\n" /* if (op != 0) 45.7% */
 199
 200"        movq    %%r12, %%r8\n"            /* r8 = lmask */
 201"        shrl    $16, %%eax\n"            /* output this.val char */
 202"        stosb\n"
 203
 204".L_get_length_code_one_time:\n"
 205"        andq    %%rdx, %%r8\n"            /* r8 &= hold */
 206"        movl    (%%rbp,%%r8,4), %%eax\n" /* eax = lcode[hold & lmask] */
 207
 208".L_dolen:\n"
 209"        movb    %%ah, %%cl\n"            /* cl = this.bits */
 210"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
 211"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */
 212
 213"        testb   %%al, %%al\n"
 214"        jnz     .L_test_for_length_base\n" /* if (op != 0) 45.7% */
 215
 216"        shrl    $16, %%eax\n"            /* output this.val char */
 217"        stosb\n"
 218"        jmp     .L_while_test\n"
 219
 220".align 32,0x90\n"
 221".L_test_for_length_base:\n"
 222"        movl    %%eax, %%r14d\n"         /* len = this */
 223"        shrl    $16, %%r14d\n"           /* len = this.val */
 224"        movb    %%al, %%cl\n"
 225
 226"        testb   $16, %%al\n"
 227"        jz      .L_test_for_second_level_length\n" /* if ((op & 16) == 0) 8% */
 228"        andb    $15, %%cl\n"             /* op &= 15 */
 229"        jz      .L_decode_distance\n"    /* if (!op) */
 230
 231".L_add_bits_to_len:\n"
 232"        subb    %%cl, %%bl\n"
 233"        xorl    %%eax, %%eax\n"
 234"        incl    %%eax\n"
 235"        shll    %%cl, %%eax\n"
 236"        decl    %%eax\n"
 237"        andl    %%edx, %%eax\n"          /* eax &= hold */
 238"        shrq    %%cl, %%rdx\n"
 239"        addl    %%eax, %%r14d\n"         /* len += hold & mask[op] */
 240
 241".L_decode_distance:\n"
 242"        movq    %%r13, %%r8\n"           /* r8 = dmask */
 243"        cmpb    $32, %%bl\n"
 244"        ja      .L_get_distance_code\n"  /* if (32 < bits) */
 245
 246"        lodsl\n"                         /* eax = *(uint *)in++ */
 247"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
 248"        addb    $32, %%bl\n"             /* bits += 32 */
 249"        shlq    %%cl, %%rax\n"
 250"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */
 251
 252".L_get_distance_code:\n"
 253"        andq    %%rdx, %%r8\n"           /* r8 &= hold */
 254"        movl    (%%r11,%%r8,4), %%eax\n" /* eax = dcode[hold & dmask] */
 255
 256".L_dodist:\n"
 257"        movl    %%eax, %%r15d\n"         /* dist = this */
 258"        shrl    $16, %%r15d\n"           /* dist = this.val */
 259"        movb    %%ah, %%cl\n"
 260"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
 261"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */
 262"        movb    %%al, %%cl\n"            /* cl = this.op */
 263
 264"        testb   $16, %%al\n"             /* if ((op & 16) == 0) */
 265"        jz      .L_test_for_second_level_dist\n"
 266"        andb    $15, %%cl\n"             /* op &= 15 */
 267"        jz      .L_check_dist_one\n"
 268
 269".L_add_bits_to_dist:\n"
 270"        subb    %%cl, %%bl\n"
 271"        xorl    %%eax, %%eax\n"
 272"        incl    %%eax\n"
 273"        shll    %%cl, %%eax\n"
 274"        decl    %%eax\n"                 /* (1 << op) - 1 */
 275"        andl    %%edx, %%eax\n"          /* eax &= hold */
 276"        shrq    %%cl, %%rdx\n"
 277"        addl    %%eax, %%r15d\n"         /* dist += hold & ((1 << op) - 1) */
 278
 279".L_check_window:\n"
 280"        movq    %%rsi, %%r8\n"           /* save in so from can use it's reg */
 281"        movq    %%rdi, %%rax\n"
 282"        subq    40(%%rsp), %%rax\n"      /* nbytes = out - beg */
 283
 284"        cmpl    %%r15d, %%eax\n"
 285"        jb      .L_clip_window\n"        /* if (dist > nbytes) 4.2% */
 286
 287"        movl    %%r14d, %%ecx\n"         /* ecx = len */
 288"        movq    %%rdi, %%rsi\n"
 289"        subq    %%r15, %%rsi\n"          /* from = out - dist */
 290
 291"        sarl    %%ecx\n"
 292"        jnc     .L_copy_two\n"           /* if len % 2 == 0 */
 293
 294"        rep     movsw\n"
 295"        movb    (%%rsi), %%al\n"
 296"        movb    %%al, (%%rdi)\n"
 297"        incq    %%rdi\n"
 298
 299"        movq    %%r8, %%rsi\n"           /* move in back to %rsi, toss from */
 300"        jmp     .L_while_test\n"
 301
 302".L_copy_two:\n"
 303"        rep     movsw\n"
 304"        movq    %%r8, %%rsi\n"           /* move in back to %rsi, toss from */
 305"        jmp     .L_while_test\n"
 306
 307".align 32,0x90\n"
 308".L_check_dist_one:\n"
 309"        cmpl    $1, %%r15d\n"            /* if dist 1, is a memset */
 310"        jne     .L_check_window\n"
 311"        cmpq    %%rdi, 40(%%rsp)\n"      /* if out == beg, outside window */
 312"        je      .L_check_window\n"
 313
 314"        movl    %%r14d, %%ecx\n"         /* ecx = len */
 315"        movb    -1(%%rdi), %%al\n"
 316"        movb    %%al, %%ah\n"
 317
 318"        sarl    %%ecx\n"
 319"        jnc     .L_set_two\n"
 320"        movb    %%al, (%%rdi)\n"
 321"        incq    %%rdi\n"
 322
 323".L_set_two:\n"
 324"        rep     stosw\n"
 325"        jmp     .L_while_test\n"
 326
 327".align 32,0x90\n"
 328".L_test_for_second_level_length:\n"
 329"        testb   $64, %%al\n"
 330"        jnz     .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */
 331
 332"        xorl    %%eax, %%eax\n"
 333"        incl    %%eax\n"
 334"        shll    %%cl, %%eax\n"
 335"        decl    %%eax\n"
 336"        andl    %%edx, %%eax\n"         /* eax &= hold */
 337"        addl    %%r14d, %%eax\n"        /* eax += len */
 338"        movl    (%%rbp,%%rax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/
 339"        jmp     .L_dolen\n"
 340
 341".align 32,0x90\n"
 342".L_test_for_second_level_dist:\n"
 343"        testb   $64, %%al\n"
 344"        jnz     .L_invalid_distance_code\n" /* if ((op & 64) != 0) */
 345
 346"        xorl    %%eax, %%eax\n"
 347"        incl    %%eax\n"
 348"        shll    %%cl, %%eax\n"
 349"        decl    %%eax\n"
 350"        andl    %%edx, %%eax\n"         /* eax &= hold */
 351"        addl    %%r15d, %%eax\n"        /* eax += dist */
 352"        movl    (%%r11,%%rax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/
 353"        jmp     .L_dodist\n"
 354
 355".align 32,0x90\n"
 356".L_clip_window:\n"
 357"        movl    %%eax, %%ecx\n"         /* ecx = nbytes */
 358"        movl    92(%%rsp), %%eax\n"     /* eax = wsize, prepare for dist cmp */
 359"        negl    %%ecx\n"                /* nbytes = -nbytes */
 360
 361"        cmpl    %%r15d, %%eax\n"
 362"        jb      .L_invalid_distance_too_far\n" /* if (dist > wsize) */
 363
 364"        addl    %%r15d, %%ecx\n"         /* nbytes = dist - nbytes */
 365"        cmpl    $0, 96(%%rsp)\n"
 366"        jne     .L_wrap_around_window\n" /* if (write != 0) */
 367
 368"        movq    56(%%rsp), %%rsi\n"     /* from  = window */
 369"        subl    %%ecx, %%eax\n"         /* eax  -= nbytes */
 370"        addq    %%rax, %%rsi\n"         /* from += wsize - nbytes */
 371
 372"        movl    %%r14d, %%eax\n"        /* eax = len */
 373"        cmpl    %%ecx, %%r14d\n"
 374"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
 375
 376"        subl    %%ecx, %%eax\n"         /* eax -= nbytes */
 377"        rep     movsb\n"
 378"        movq    %%rdi, %%rsi\n"
 379"        subq    %%r15, %%rsi\n"         /* from = &out[ -dist ] */
 380"        jmp     .L_do_copy\n"
 381
 382".align 32,0x90\n"
 383".L_wrap_around_window:\n"
 384"        movl    96(%%rsp), %%eax\n"     /* eax = write */
 385"        cmpl    %%eax, %%ecx\n"
 386"        jbe     .L_contiguous_in_window\n" /* if (write >= nbytes) */
 387
 388"        movl    92(%%rsp), %%esi\n"     /* from  = wsize */
 389"        addq    56(%%rsp), %%rsi\n"     /* from += window */
 390"        addq    %%rax, %%rsi\n"         /* from += write */
 391"        subq    %%rcx, %%rsi\n"         /* from -= nbytes */
 392"        subl    %%eax, %%ecx\n"         /* nbytes -= write */
 393
 394"        movl    %%r14d, %%eax\n"        /* eax = len */
 395"        cmpl    %%ecx, %%eax\n"
 396"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
 397
 398"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
 399"        rep     movsb\n"
 400"        movq    56(%%rsp), %%rsi\n"     /* from = window */
 401"        movl    96(%%rsp), %%ecx\n"     /* nbytes = write */
 402"        cmpl    %%ecx, %%eax\n"
 403"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
 404
 405"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
 406"        rep     movsb\n"
 407"        movq    %%rdi, %%rsi\n"
 408"        subq    %%r15, %%rsi\n"         /* from = out - dist */
 409"        jmp     .L_do_copy\n"
 410
 411".align 32,0x90\n"
 412".L_contiguous_in_window:\n"
 413"        movq    56(%%rsp), %%rsi\n"     /* rsi = window */
 414"        addq    %%rax, %%rsi\n"
 415"        subq    %%rcx, %%rsi\n"         /* from += write - nbytes */
 416
 417"        movl    %%r14d, %%eax\n"        /* eax = len */
 418"        cmpl    %%ecx, %%eax\n"
 419"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
 420
 421"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
 422"        rep     movsb\n"
 423"        movq    %%rdi, %%rsi\n"
 424"        subq    %%r15, %%rsi\n"         /* from = out - dist */
 425"        jmp     .L_do_copy\n"           /* if (nbytes >= len) */
 426
 427".align 32,0x90\n"
 428".L_do_copy:\n"
 429"        movl    %%eax, %%ecx\n"         /* ecx = len */
 430"        rep     movsb\n"
 431
 432"        movq    %%r8, %%rsi\n"          /* move in back to %esi, toss from */
 433"        jmp     .L_while_test\n"
 434
 435".L_test_for_end_of_block:\n"
 436"        testb   $32, %%al\n"
 437"        jz      .L_invalid_literal_length_code\n"
 438"        movl    $1, 116(%%rsp)\n"
 439"        jmp     .L_break_loop_with_status\n"
 440
 441".L_invalid_literal_length_code:\n"
 442"        movl    $2, 116(%%rsp)\n"
 443"        jmp     .L_break_loop_with_status\n"
 444
 445".L_invalid_distance_code:\n"
 446"        movl    $3, 116(%%rsp)\n"
 447"        jmp     .L_break_loop_with_status\n"
 448
 449".L_invalid_distance_too_far:\n"
 450"        movl    $4, 116(%%rsp)\n"
 451"        jmp     .L_break_loop_with_status\n"
 452
 453".L_break_loop:\n"
 454"        movl    $0, 116(%%rsp)\n"
 455
 456".L_break_loop_with_status:\n"
 457/* put in, out, bits, and hold back into ar and pop esp */
 458"        movq    %%rsi, 16(%%rsp)\n"     /* in */
 459"        movq    %%rdi, 32(%%rsp)\n"     /* out */
 460"        movl    %%ebx, 88(%%rsp)\n"     /* bits */
 461"        movq    %%rdx, 80(%%rsp)\n"     /* hold */
 462"        movq    (%%rsp), %%rax\n"       /* restore rbp and rsp */
 463"        movq    8(%%rsp), %%rbp\n"
 464"        movq    %%rax, %%rsp\n"
 465          :
 466          : "m" (ar)
 467          : "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi",
 468            "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15"
 469    );
 470#elif ( defined( __GNUC__ ) || defined( __ICC ) ) && defined( __i386 )
 471    __asm__ __volatile__ (
 472"        leal    %0, %%eax\n"
 473"        movl    %%esp, (%%eax)\n"        /* save esp, ebp */
 474"        movl    %%ebp, 4(%%eax)\n"
 475"        movl    %%eax, %%esp\n"
 476"        movl    8(%%esp), %%esi\n"       /* esi = in */
 477"        movl    16(%%esp), %%edi\n"      /* edi = out */
 478"        movl    40(%%esp), %%edx\n"      /* edx = hold */
 479"        movl    44(%%esp), %%ebx\n"      /* ebx = bits */
 480"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
 481
 482"        cld\n"
 483"        jmp     .L_do_loop\n"
 484
 485".align 32,0x90\n"
 486".L_while_test:\n"
 487"        cmpl    %%edi, 24(%%esp)\n"      /* out < end */
 488"        jbe     .L_break_loop\n"
 489"        cmpl    %%esi, 12(%%esp)\n"      /* in < last */
 490"        jbe     .L_break_loop\n"
 491
 492".L_do_loop:\n"
 493"        cmpb    $15, %%bl\n"
 494"        ja      .L_get_length_code\n"    /* if (15 < bits) */
 495
 496"        xorl    %%eax, %%eax\n"
 497"        lodsw\n"                         /* al = *(ushort *)in++ */
 498"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
 499"        addb    $16, %%bl\n"             /* bits += 16 */
 500"        shll    %%cl, %%eax\n"
 501"        orl     %%eax, %%edx\n"        /* hold |= *((ushort *)in)++ << bits */
 502
 503".L_get_length_code:\n"
 504"        movl    56(%%esp), %%eax\n"      /* eax = lmask */
 505"        andl    %%edx, %%eax\n"          /* eax &= hold */
 506"        movl    (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[hold & lmask] */
 507
 508".L_dolen:\n"
 509"        movb    %%ah, %%cl\n"            /* cl = this.bits */
 510"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
 511"        shrl    %%cl, %%edx\n"           /* hold >>= this.bits */
 512
 513"        testb   %%al, %%al\n"
 514"        jnz     .L_test_for_length_base\n" /* if (op != 0) 45.7% */
 515
 516"        shrl    $16, %%eax\n"            /* output this.val char */
 517"        stosb\n"
 518"        jmp     .L_while_test\n"
 519
 520".align 32,0x90\n"
 521".L_test_for_length_base:\n"
 522"        movl    %%eax, %%ecx\n"          /* len = this */
 523"        shrl    $16, %%ecx\n"            /* len = this.val */
 524"        movl    %%ecx, 64(%%esp)\n"      /* save len */
 525"        movb    %%al, %%cl\n"
 526
 527"        testb   $16, %%al\n"
 528"        jz      .L_test_for_second_level_length\n" /* if ((op & 16) == 0) 8% */
 529"        andb    $15, %%cl\n"             /* op &= 15 */
 530"        jz      .L_decode_distance\n"    /* if (!op) */
 531"        cmpb    %%cl, %%bl\n"
 532"        jae     .L_add_bits_to_len\n"    /* if (op <= bits) */
 533
 534"        movb    %%cl, %%ch\n"            /* stash op in ch, freeing cl */
 535"        xorl    %%eax, %%eax\n"
 536"        lodsw\n"                         /* al = *(ushort *)in++ */
 537"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
 538"        addb    $16, %%bl\n"             /* bits += 16 */
 539"        shll    %%cl, %%eax\n"
 540"        orl     %%eax, %%edx\n"         /* hold |= *((ushort *)in)++ << bits */
 541"        movb    %%ch, %%cl\n"            /* move op back to ecx */
 542
 543".L_add_bits_to_len:\n"
 544"        subb    %%cl, %%bl\n"
 545"        xorl    %%eax, %%eax\n"
 546"        incl    %%eax\n"
 547"        shll    %%cl, %%eax\n"
 548"        decl    %%eax\n"
 549"        andl    %%edx, %%eax\n"          /* eax &= hold */
 550"        shrl    %%cl, %%edx\n"
 551"        addl    %%eax, 64(%%esp)\n"      /* len += hold & mask[op] */
 552
 553".L_decode_distance:\n"
 554"        cmpb    $15, %%bl\n"
 555"        ja      .L_get_distance_code\n"  /* if (15 < bits) */
 556
 557"        xorl    %%eax, %%eax\n"
 558"        lodsw\n"                         /* al = *(ushort *)in++ */
 559"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
 560"        addb    $16, %%bl\n"             /* bits += 16 */
 561"        shll    %%cl, %%eax\n"
 562"        orl     %%eax, %%edx\n"         /* hold |= *((ushort *)in)++ << bits */
 563
 564".L_get_distance_code:\n"
 565"        movl    60(%%esp), %%eax\n"      /* eax = dmask */
 566"        movl    36(%%esp), %%ecx\n"      /* ecx = dcode */
 567"        andl    %%edx, %%eax\n"          /* eax &= hold */
 568"        movl    (%%ecx,%%eax,4), %%eax\n"/* eax = dcode[hold & dmask] */
 569
 570".L_dodist:\n"
 571"        movl    %%eax, %%ebp\n"          /* dist = this */
 572"        shrl    $16, %%ebp\n"            /* dist = this.val */
 573"        movb    %%ah, %%cl\n"
 574"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
 575"        shrl    %%cl, %%edx\n"           /* hold >>= this.bits */
 576"        movb    %%al, %%cl\n"            /* cl = this.op */
 577
 578"        testb   $16, %%al\n"             /* if ((op & 16) == 0) */
 579"        jz      .L_test_for_second_level_dist\n"
 580"        andb    $15, %%cl\n"             /* op &= 15 */
 581"        jz      .L_check_dist_one\n"
 582"        cmpb    %%cl, %%bl\n"
 583"        jae     .L_add_bits_to_dist\n"   /* if (op <= bits) 97.6% */
 584
 585"        movb    %%cl, %%ch\n"            /* stash op in ch, freeing cl */
 586"        xorl    %%eax, %%eax\n"
 587"        lodsw\n"                         /* al = *(ushort *)in++ */
 588"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
 589"        addb    $16, %%bl\n"             /* bits += 16 */
 590"        shll    %%cl, %%eax\n"
 591"        orl     %%eax, %%edx\n"        /* hold |= *((ushort *)in)++ << bits */
 592"        movb    %%ch, %%cl\n"            /* move op back to ecx */
 593
 594".L_add_bits_to_dist:\n"
 595"        subb    %%cl, %%bl\n"
 596"        xorl    %%eax, %%eax\n"
 597"        incl    %%eax\n"
 598"        shll    %%cl, %%eax\n"
 599"        decl    %%eax\n"                 /* (1 << op) - 1 */
 600"        andl    %%edx, %%eax\n"          /* eax &= hold */
 601"        shrl    %%cl, %%edx\n"
 602"        addl    %%eax, %%ebp\n"          /* dist += hold & ((1 << op) - 1) */
 603
 604".L_check_window:\n"
 605"        movl    %%esi, 8(%%esp)\n"       /* save in so from can use it's reg */
 606"        movl    %%edi, %%eax\n"
 607"        subl    20(%%esp), %%eax\n"      /* nbytes = out - beg */
 608
 609"        cmpl    %%ebp, %%eax\n"
 610"        jb      .L_clip_window\n"        /* if (dist > nbytes) 4.2% */
 611
 612"        movl    64(%%esp), %%ecx\n"      /* ecx = len */
 613"        movl    %%edi, %%esi\n"
 614"        subl    %%ebp, %%esi\n"          /* from = out - dist */
 615
 616"        sarl    %%ecx\n"
 617"        jnc     .L_copy_two\n"           /* if len % 2 == 0 */
 618
 619"        rep     movsw\n"
 620"        movb    (%%esi), %%al\n"
 621"        movb    %%al, (%%edi)\n"
 622"        incl    %%edi\n"
 623
 624"        movl    8(%%esp), %%esi\n"       /* move in back to %esi, toss from */
 625"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
 626"        jmp     .L_while_test\n"
 627
 628".L_copy_two:\n"
 629"        rep     movsw\n"
 630"        movl    8(%%esp), %%esi\n"       /* move in back to %esi, toss from */
 631"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
 632"        jmp     .L_while_test\n"
 633
 634".align 32,0x90\n"
 635".L_check_dist_one:\n"
 636"        cmpl    $1, %%ebp\n"            /* if dist 1, is a memset */
 637"        jne     .L_check_window\n"
 638"        cmpl    %%edi, 20(%%esp)\n"
 639"        je      .L_check_window\n"      /* out == beg, if outside window */
 640
 641"        movl    64(%%esp), %%ecx\n"      /* ecx = len */
 642"        movb    -1(%%edi), %%al\n"
 643"        movb    %%al, %%ah\n"
 644
 645"        sarl    %%ecx\n"
 646"        jnc     .L_set_two\n"
 647"        movb    %%al, (%%edi)\n"
 648"        incl    %%edi\n"
 649
 650".L_set_two:\n"
 651"        rep     stosw\n"
 652"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
 653"        jmp     .L_while_test\n"
 654
 655".align 32,0x90\n"
 656".L_test_for_second_level_length:\n"
 657"        testb   $64, %%al\n"
 658"        jnz     .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */
 659
 660"        xorl    %%eax, %%eax\n"
 661"        incl    %%eax\n"
 662"        shll    %%cl, %%eax\n"
 663"        decl    %%eax\n"
 664"        andl    %%edx, %%eax\n"         /* eax &= hold */
 665"        addl    64(%%esp), %%eax\n"     /* eax += len */
 666"        movl    (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/
 667"        jmp     .L_dolen\n"
 668
 669".align 32,0x90\n"
 670".L_test_for_second_level_dist:\n"
 671"        testb   $64, %%al\n"
 672"        jnz     .L_invalid_distance_code\n" /* if ((op & 64) != 0) */
 673
 674"        xorl    %%eax, %%eax\n"
 675"        incl    %%eax\n"
 676"        shll    %%cl, %%eax\n"
 677"        decl    %%eax\n"
 678"        andl    %%edx, %%eax\n"         /* eax &= hold */
 679"        addl    %%ebp, %%eax\n"         /* eax += dist */
 680"        movl    36(%%esp), %%ecx\n"     /* ecx = dcode */
 681"        movl    (%%ecx,%%eax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/
 682"        jmp     .L_dodist\n"
 683
 684".align 32,0x90\n"
 685".L_clip_window:\n"
 686"        movl    %%eax, %%ecx\n"
 687"        movl    48(%%esp), %%eax\n"     /* eax = wsize */
 688"        negl    %%ecx\n"                /* nbytes = -nbytes */
 689"        movl    28(%%esp), %%esi\n"     /* from = window */
 690
 691"        cmpl    %%ebp, %%eax\n"
 692"        jb      .L_invalid_distance_too_far\n" /* if (dist > wsize) */
 693
 694"        addl    %%ebp, %%ecx\n"         /* nbytes = dist - nbytes */
 695"        cmpl    $0, 52(%%esp)\n"
 696"        jne     .L_wrap_around_window\n" /* if (write != 0) */
 697
 698"        subl    %%ecx, %%eax\n"
 699"        addl    %%eax, %%esi\n"         /* from += wsize - nbytes */
 700
 701"        movl    64(%%esp), %%eax\n"     /* eax = len */
 702"        cmpl    %%ecx, %%eax\n"
 703"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
 704
 705"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
 706"        rep     movsb\n"
 707"        movl    %%edi, %%esi\n"
 708"        subl    %%ebp, %%esi\n"         /* from = out - dist */
 709"        jmp     .L_do_copy\n"
 710
 711".align 32,0x90\n"
 712".L_wrap_around_window:\n"
 713"        movl    52(%%esp), %%eax\n"     /* eax = write */
 714"        cmpl    %%eax, %%ecx\n"
 715"        jbe     .L_contiguous_in_window\n" /* if (write >= nbytes) */
 716
 717"        addl    48(%%esp), %%esi\n"     /* from += wsize */
 718"        addl    %%eax, %%esi\n"         /* from += write */
 719"        subl    %%ecx, %%esi\n"         /* from -= nbytes */
 720"        subl    %%eax, %%ecx\n"         /* nbytes -= write */
 721
 722"        movl    64(%%esp), %%eax\n"     /* eax = len */
 723"        cmpl    %%ecx, %%eax\n"
 724"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
 725
 726"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
 727"        rep     movsb\n"
 728"        movl    28(%%esp), %%esi\n"     /* from = window */
 729"        movl    52(%%esp), %%ecx\n"     /* nbytes = write */
 730"        cmpl    %%ecx, %%eax\n"
 731"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
 732
 733"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
 734"        rep     movsb\n"
 735"        movl    %%edi, %%esi\n"
 736"        subl    %%ebp, %%esi\n"         /* from = out - dist */
 737"        jmp     .L_do_copy\n"
 738
 739".align 32,0x90\n"
 740".L_contiguous_in_window:\n"
 741"        addl    %%eax, %%esi\n"
 742"        subl    %%ecx, %%esi\n"         /* from += write - nbytes */
 743
 744"        movl    64(%%esp), %%eax\n"     /* eax = len */
 745"        cmpl    %%ecx, %%eax\n"
 746"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
 747
 748"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
 749"        rep     movsb\n"
 750"        movl    %%edi, %%esi\n"
 751"        subl    %%ebp, %%esi\n"         /* from = out - dist */
 752"        jmp     .L_do_copy\n"           /* if (nbytes >= len) */
 753
 754".align 32,0x90\n"
 755".L_do_copy:\n"
 756"        movl    %%eax, %%ecx\n"
 757"        rep     movsb\n"
 758
 759"        movl    8(%%esp), %%esi\n"      /* move in back to %esi, toss from */
 760"        movl    32(%%esp), %%ebp\n"     /* ebp = lcode */
 761"        jmp     .L_while_test\n"
 762
 763".L_test_for_end_of_block:\n"
 764"        testb   $32, %%al\n"
 765"        jz      .L_invalid_literal_length_code\n"
 766"        movl    $1, 72(%%esp)\n"
 767"        jmp     .L_break_loop_with_status\n"
 768
 769".L_invalid_literal_length_code:\n"
 770"        movl    $2, 72(%%esp)\n"
 771"        jmp     .L_break_loop_with_status\n"
 772
 773".L_invalid_distance_code:\n"
 774"        movl    $3, 72(%%esp)\n"
 775"        jmp     .L_break_loop_with_status\n"
 776
 777".L_invalid_distance_too_far:\n"
 778"        movl    8(%%esp), %%esi\n"
 779"        movl    $4, 72(%%esp)\n"
 780"        jmp     .L_break_loop_with_status\n"
 781
 782".L_break_loop:\n"
 783"        movl    $0, 72(%%esp)\n"
 784
 785".L_break_loop_with_status:\n"
 786/* put in, out, bits, and hold back into ar and pop esp */
 787"        movl    %%esi, 8(%%esp)\n"      /* save in */
 788"        movl    %%edi, 16(%%esp)\n"     /* save out */
 789"        movl    %%ebx, 44(%%esp)\n"     /* save bits */
 790"        movl    %%edx, 40(%%esp)\n"     /* save hold */
 791"        movl    4(%%esp), %%ebp\n"      /* restore esp, ebp */
 792"        movl    (%%esp), %%esp\n"
 793          :
 794          : "m" (ar)
 795          : "memory", "%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi"
 796    );
 797#elif defined( _MSC_VER ) && ! defined( _M_AMD64 )
 798    __asm {
 799	lea	eax, ar
 800	mov	[eax], esp         /* save esp, ebp */
 801	mov	[eax+4], ebp
 802	mov	esp, eax
 803	mov	esi, [esp+8]       /* esi = in */
 804	mov	edi, [esp+16]      /* edi = out */
 805	mov	edx, [esp+40]      /* edx = hold */
 806	mov	ebx, [esp+44]      /* ebx = bits */
 807	mov	ebp, [esp+32]      /* ebp = lcode */
 808
 809	cld
 810	jmp	L_do_loop
 811
 812ALIGN 4
 813L_while_test:
 814	cmp	[esp+24], edi
 815	jbe	L_break_loop
 816	cmp	[esp+12], esi
 817	jbe	L_break_loop
 818
 819L_do_loop:
 820	cmp	bl, 15
 821	ja	L_get_length_code    /* if (15 < bits) */
 822
 823	xor	eax, eax
 824	lodsw                         /* al = *(ushort *)in++ */
 825	mov	cl, bl            /* cl = bits, needs it for shifting */
 826	add	bl, 16             /* bits += 16 */
 827	shl	eax, cl
 828	or	edx, eax        /* hold |= *((ushort *)in)++ << bits */
 829
 830L_get_length_code:
 831	mov	eax, [esp+56]      /* eax = lmask */
 832	and	eax, edx          /* eax &= hold */
 833	mov	eax, [ebp+eax*4] /* eax = lcode[hold & lmask] */
 834
 835L_dolen:
 836	mov	cl, ah            /* cl = this.bits */
 837	sub	bl, ah            /* bits -= this.bits */
 838	shr	edx, cl           /* hold >>= this.bits */
 839
 840	test	al, al
 841	jnz	L_test_for_length_base /* if (op != 0) 45.7% */
 842
 843	shr	eax, 16            /* output this.val char */
 844	stosb
 845	jmp	L_while_test
 846
 847ALIGN 4
 848L_test_for_length_base:
 849	mov	ecx, eax          /* len = this */
 850	shr	ecx, 16            /* len = this.val */
 851	mov	[esp+64], ecx      /* save len */
 852	mov	cl, al
 853
 854	test	al, 16
 855	jz	L_test_for_second_level_length /* if ((op & 16) == 0) 8% */
 856	and	cl, 15             /* op &= 15 */
 857	jz	L_decode_distance    /* if (!op) */
 858	cmp	bl, cl
 859	jae	L_add_bits_to_len    /* if (op <= bits) */
 860
 861	mov	ch, cl            /* stash op in ch, freeing cl */
 862	xor	eax, eax
 863	lodsw                         /* al = *(ushort *)in++ */
 864	mov	cl, bl            /* cl = bits, needs it for shifting */
 865	add	bl, 16             /* bits += 16 */
 866	shl	eax, cl
 867	or	edx, eax         /* hold |= *((ushort *)in)++ << bits */
 868	mov	cl, ch            /* move op back to ecx */
 869
 870L_add_bits_to_len:
 871	sub	bl, cl
 872	xor	eax, eax
 873	inc	eax
 874	shl	eax, cl
 875	dec	eax
 876	and	eax, edx          /* eax &= hold */
 877	shr	edx, cl
 878	add	[esp+64], eax      /* len += hold & mask[op] */
 879
 880L_decode_distance:
 881	cmp	bl, 15
 882	ja	L_get_distance_code  /* if (15 < bits) */
 883
 884	xor	eax, eax
 885	lodsw                         /* al = *(ushort *)in++ */
 886	mov	cl, bl            /* cl = bits, needs it for shifting */
 887	add	bl, 16             /* bits += 16 */
 888	shl	eax, cl
 889	or	edx, eax         /* hold |= *((ushort *)in)++ << bits */
 890
 891L_get_distance_code:
 892	mov	eax, [esp+60]      /* eax = dmask */
 893	mov	ecx, [esp+36]      /* ecx = dcode */
 894	and	eax, edx          /* eax &= hold */
 895	mov	eax, [ecx+eax*4]/* eax = dcode[hold & dmask] */
 896
 897L_dodist:
 898	mov	ebp, eax          /* dist = this */
 899	shr	ebp, 16            /* dist = this.val */
 900	mov	cl, ah
 901	sub	bl, ah            /* bits -= this.bits */
 902	shr	edx, cl           /* hold >>= this.bits */
 903	mov	cl, al            /* cl = this.op */
 904
 905	test	al, 16             /* if ((op & 16) == 0) */
 906	jz	L_test_for_second_level_dist
 907	and	cl, 15             /* op &= 15 */
 908	jz	L_check_dist_one
 909	cmp	bl, cl
 910	jae	L_add_bits_to_dist   /* if (op <= bits) 97.6% */
 911
 912	mov	ch, cl            /* stash op in ch, freeing cl */
 913	xor	eax, eax
 914	lodsw                         /* al = *(ushort *)in++ */
 915	mov	cl, bl            /* cl = bits, needs it for shifting */
 916	add	bl, 16             /* bits += 16 */
 917	shl	eax, cl
 918	or	edx, eax        /* hold |= *((ushort *)in)++ << bits */
 919	mov	cl, ch            /* move op back to ecx */
 920
 921L_add_bits_to_dist:
 922	sub	bl, cl
 923	xor	eax, eax
 924	inc	eax
 925	shl	eax, cl
 926	dec	eax                 /* (1 << op) - 1 */
 927	and	eax, edx          /* eax &= hold */
 928	shr	edx, cl
 929	add	ebp, eax          /* dist += hold & ((1 << op) - 1) */
 930
 931L_check_window:
 932	mov	[esp+8], esi       /* save in so from can use it's reg */
 933	mov	eax, edi
 934	sub	eax, [esp+20]      /* nbytes = out - beg */
 935
 936	cmp	eax, ebp
 937	jb	L_clip_window        /* if (dist > nbytes) 4.2% */
 938
 939	mov	ecx, [esp+64]      /* ecx = len */
 940	mov	esi, edi
 941	sub	esi, ebp          /* from = out - dist */
 942
 943	sar	ecx, 1
 944	jnc	L_copy_two
 945
 946	rep     movsw
 947	mov	al, [esi]
 948	mov	[edi], al
 949	inc	edi
 950
 951	mov	esi, [esp+8]      /* move in back to %esi, toss from */
 952	mov	ebp, [esp+32]     /* ebp = lcode */
 953	jmp	L_while_test
 954
 955L_copy_two:
 956	rep     movsw
 957	mov	esi, [esp+8]      /* move in back to %esi, toss from */
 958	mov	ebp, [esp+32]     /* ebp = lcode */
 959	jmp	L_while_test
 960
 961ALIGN 4
 962L_check_dist_one:
 963	cmp	ebp, 1            /* if dist 1, is a memset */
 964	jne	L_check_window
 965	cmp	[esp+20], edi
 966	je	L_check_window    /* out == beg, if outside window */
 967
 968	mov	ecx, [esp+64]     /* ecx = len */
 969	mov	al, [edi-1]
 970	mov	ah, al
 971
 972	sar	ecx, 1
 973	jnc	L_set_two
 974	mov	[edi], al         /* memset out with from[-1] */
 975	inc	edi
 976
 977L_set_two:
 978	rep     stosw
 979	mov	ebp, [esp+32]     /* ebp = lcode */
 980	jmp	L_while_test
 981
 982ALIGN 4
 983L_test_for_second_level_length:
 984	test	al, 64
 985	jnz	L_test_for_end_of_block /* if ((op & 64) != 0) */
 986
 987	xor	eax, eax
 988	inc	eax
 989	shl	eax, cl
 990	dec	eax
 991	and	eax, edx         /* eax &= hold */
 992	add	eax, [esp+64]     /* eax += len */
 993	mov	eax, [ebp+eax*4] /* eax = lcode[val+(hold&mask[op])]*/
 994	jmp	L_dolen
 995
 996ALIGN 4
 997L_test_for_second_level_dist:
 998	test	al, 64
 999	jnz	L_invalid_distance_code /* if ((op & 64) != 0) */
1000
1001	xor	eax, eax
1002	inc	eax
1003	shl	eax, cl
1004	dec	eax
1005	and	eax, edx         /* eax &= hold */
1006	add	eax, ebp         /* eax += dist */
1007	mov	ecx, [esp+36]     /* ecx = dcode */
1008	mov	eax, [ecx+eax*4] /* eax = dcode[val+(hold&mask[op])]*/
1009	jmp	L_dodist
1010
1011ALIGN 4
1012L_clip_window:
1013	mov	ecx, eax
1014	mov	eax, [esp+48]     /* eax = wsize */
1015	neg	ecx                /* nbytes = -nbytes */
1016	mov	esi, [esp+28]     /* from = window */
1017
1018	cmp	eax, ebp
1019	jb	L_invalid_distance_too_far /* if (dist > wsize) */
1020
1021	add	ecx, ebp         /* nbytes = dist - nbytes */
1022	cmp	dword ptr [esp+52], 0
1023	jne	L_wrap_around_window /* if (write != 0) */
1024
1025	sub	eax, ecx
1026	add	esi, eax         /* from += wsize - nbytes */
1027
1028	mov	eax, [esp+64]    /* eax = len */
1029	cmp	eax, ecx
1030	jbe	L_do_copy          /* if (nbytes >= len) */
1031
1032	sub	eax, ecx         /* len -= nbytes */
1033	rep     movsb
1034	mov	esi, edi
1035	sub	esi, ebp         /* from = out - dist */
1036	jmp	L_do_copy
1037
1038ALIGN 4
1039L_wrap_around_window:
1040	mov	eax, [esp+52]    /* eax = write */
1041	cmp	ecx, eax
1042	jbe	L_contiguous_in_window /* if (write >= nbytes) */
1043
1044	add	esi, [esp+48]    /* from += wsize */
1045	add	esi, eax         /* from += write */
1046	sub	esi, ecx         /* from -= nbytes */
1047	sub	ecx, eax         /* nbytes -= write */
1048
1049	mov	eax, [esp+64]    /* eax = len */
1050	cmp	eax, ecx
1051	jbe	L_do_copy          /* if (nbytes >= len) */
1052
1053	sub	eax, ecx         /* len -= nbytes */
1054	rep     movsb
1055	mov	esi, [esp+28]     /* from = window */
1056	mov	ecx, [esp+52]     /* nbytes = write */
1057	cmp	eax, ecx
1058	jbe	L_do_copy          /* if (nbytes >= len) */
1059
1060	sub	eax, ecx         /* len -= nbytes */
1061	rep     movsb
1062	mov	esi, edi
1063	sub	esi, ebp         /* from = out - dist */
1064	jmp	L_do_copy
1065
1066ALIGN 4
1067L_contiguous_in_window:
1068	add	esi, eax
1069	sub	esi, ecx         /* from += write - nbytes */
1070
1071	mov	eax, [esp+64]    /* eax = len */
1072	cmp	eax, ecx
1073	jbe	L_do_copy          /* if (nbytes >= len) */
1074
1075	sub	eax, ecx         /* len -= nbytes */
1076	rep     movsb
1077	mov	esi, edi
1078	sub	esi, ebp         /* from = out - dist */
1079	jmp	L_do_copy
1080
1081ALIGN 4
1082L_do_copy:
1083	mov	ecx, eax
1084	rep     movsb
1085
1086	mov	esi, [esp+8]      /* move in back to %esi, toss from */
1087	mov	ebp, [esp+32]     /* ebp = lcode */
1088	jmp	L_while_test
1089
1090L_test_for_end_of_block:
1091	test	al, 32
1092	jz	L_invalid_literal_length_code
1093	mov	dword ptr [esp+72], 1
1094	jmp	L_break_loop_with_status
1095
1096L_invalid_literal_length_code:
1097	mov	dword ptr [esp+72], 2
1098	jmp	L_break_loop_with_status
1099
1100L_invalid_distance_code:
1101	mov	dword ptr [esp+72], 3
1102	jmp	L_break_loop_with_status
1103
1104L_invalid_distance_too_far:
1105	mov	esi, [esp+4]
1106	mov	dword ptr [esp+72], 4
1107	jmp	L_break_loop_with_status
1108
1109L_break_loop:
1110	mov	dword ptr [esp+72], 0
1111
1112L_break_loop_with_status:
1113/* put in, out, bits, and hold back into ar and pop esp */
1114	mov	[esp+8], esi     /* save in */
1115	mov	[esp+16], edi    /* save out */
1116	mov	[esp+44], ebx    /* save bits */
1117	mov	[esp+40], edx    /* save hold */
1118	mov	ebp, [esp+4]     /* restore esp, ebp */
1119	mov	esp, [esp]
1120    }
1121#else
1122#error "x86 architecture not defined"
1123#endif
1124
1125    if (ar.status > 1) {
1126        if (ar.status == 2)
1127            strm->msg = "invalid literal/length code";
1128        else if (ar.status == 3)
1129            strm->msg = "invalid distance code";
1130        else
1131            strm->msg = "invalid distance too far back";
1132        state->mode = BAD;
1133    }
1134    else if ( ar.status == 1 ) {
1135        state->mode = TYPE;
1136    }
1137
1138    /* return unused bytes (on entry, bits < 8, so in won't go too far back) */
1139    ar.len = ar.bits >> 3;
1140    ar.in -= ar.len;
1141    ar.bits -= ar.len << 3;
1142    ar.hold &= (1U << ar.bits) - 1;
1143
1144    /* update state and return */
1145    strm->next_in = ar.in;
1146    strm->next_out = ar.out;
1147    strm->avail_in = (unsigned)(ar.in < ar.last ?
1148                                PAD_AVAIL_IN + (ar.last - ar.in) :
1149                                PAD_AVAIL_IN - (ar.in - ar.last));
1150    strm->avail_out = (unsigned)(ar.out < ar.end ?
1151                                 PAD_AVAIL_OUT + (ar.end - ar.out) :
1152                                 PAD_AVAIL_OUT - (ar.out - ar.end));
1153    state->hold = ar.hold;
1154    state->bits = ar.bits;
1155    return;
1156}
1157