zlib 1.2.2.1v1.2.2.1

1 files changed, 586 insertions, 212 deletions

diff --git a/contrib/inflate86/inffas86.c b/contrib/inflate86/inffas86.c
index 4534693..6da7635 100644
--- a/contrib/inflate86/inffas86.c
+++ b/contrib/inflate86/inffas86.c
@@ -7,6 +7,15 @@
  * Copyright (C) 2003 Chris Anderson <christop@charm.net>
  * Please use the copyright conditions above.
  *
+ * Dec-29-2003 -- I added AMD64 inflate asm support.  This version is also
+ * slightly quicker on x86 systems because, instead of using rep movsb to copy
+ * data, it uses rep movsw, which moves data in 2-byte chunks instead of single
+ * bytes.  I've tested the AMD64 code on a Fedora Core 1 + the x86_64 updates
+ * from http://fedora.linux.duke.edu/fc1_x86_64
+ * which is running on an Athlon 64 3000+ / Gigabyte GA-K8VT800M system with
+ * 1GB ram.  The 64-bit version is about 4% faster than the 32-bit version,
+ * when decompressing mozilla-source-1.3.tar.gz.
+ *
  * Mar-13-2003 -- Most of this is derived from inffast.S which is derived from
  * the gcc -S output of zlib-1.2.0/inffast.c.  Zlib-1.2.0 is in beta release at
  * the moment.  I have successfully compiled and tested this code with gcc2.96,
@@ -65,33 +74,44 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
 {
     struct inflate_state FAR *state;
     struct inffast_ar {
-      void *esp;                  /* esp save */
-      unsigned char FAR *in;      /* local strm->next_in */
-      unsigned char FAR *last;    /* while in < last, enough input available */
-      unsigned char FAR *out;     /* local strm->next_out */
-      unsigned char FAR *beg;     /* inflate()'s initial strm->next_out */
-      unsigned char FAR *end;     /* while out < end, enough space available */
-      unsigned wsize;             /* window size or zero if not using window */
-      unsigned write;             /* window write index */
-      unsigned char FAR *window;  /* allocated sliding window, if wsize != 0 */
-      unsigned long hold;         /* local strm->hold */
-      unsigned bits;              /* local strm->bits */
-      code const FAR *lcode;      /* local strm->lencode */
-      code const FAR *dcode;      /* local strm->distcode */
-      unsigned lmask;             /* mask for first level of length codes */
-      unsigned dmask;             /* mask for first level of distance codes */
-      unsigned len;               /* match length, unused bytes */
-      unsigned dist;              /* match distance */
-      unsigned status;            /* this is set when state changes */
+/* 64   32                               x86  x86_64 */
+/* ar offset                              register */
+/*  0    0 */ void *esp;                /* esp save */
+/*  8    4 */ void *ebp;                /* ebp save */
+/* 16    8 */ unsigned char FAR *in;    /* esi rsi  local strm->next_in */
+/* 24   12 */ unsigned char FAR *last;  /*     r9   while in < last */
+/* 32   16 */ unsigned char FAR *out;   /* edi rdi  local strm->next_out */
+/* 40   20 */ unsigned char FAR *beg;   /*          inflate()'s init next_out */
+/* 48   24 */ unsigned char FAR *end;   /*     r10  while out < end */
+/* 56   28 */ unsigned char FAR *window;/*          size of window, wsize!=0 */
+/* 64   32 */ code const FAR *lcode;    /* ebp rbp  local strm->lencode */
+/* 72   36 */ code const FAR *dcode;    /*     r11  local strm->distcode */
+/* 80   40 */ unsigned long hold;       /* edx rdx  local strm->hold */
+/* 88   44 */ unsigned bits;            /* ebx rbx  local strm->bits */
+/* 92   48 */ unsigned wsize;           /*          window size */
+/* 96   52 */ unsigned write;           /*          window write index */
+/*100   56 */ unsigned lmask;           /*     r12  mask for lcode */
+/*104   60 */ unsigned dmask;           /*     r13  mask for dcode */
+/*108   64 */ unsigned len;             /*     r14  match length */
+/*112   68 */ unsigned dist;            /*     r15  match distance */
+/*116   72 */ unsigned status;          /*          set when state chng*/
     } ar;
 
+#if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )
+#define PAD_AVAIL_IN 6
+#define PAD_AVAIL_OUT 258
+#else
+#define PAD_AVAIL_IN 5
+#define PAD_AVAIL_OUT 257
+#endif
+
     /* copy state to local variables */
     state = (struct inflate_state FAR *)strm->state;
     ar.in = strm->next_in;
-    ar.last = ar.in + (strm->avail_in - 5);
+    ar.last = ar.in + (strm->avail_in - PAD_AVAIL_IN);
     ar.out = strm->next_out;
     ar.beg = ar.out - (start - strm->avail_out);
-    ar.end = ar.out + (strm->avail_out - 257);
+    ar.end = ar.out + (strm->avail_out - PAD_AVAIL_OUT);
     ar.wsize = state->wsize;
     ar.write = state->write;
     ar.window = state->window;
@@ -105,32 +125,368 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
     /* decode literals and length/distances until end-of-block or not enough
        input data or output space */
 
-    /* align in on 2 byte boundary */
-    if (((unsigned long)(void *)ar.in & 0x1) != 0) {
+    /* align in on 1/2 hold size boundary */
+    while (((unsigned long)(void *)ar.in & (sizeof(ar.hold) / 2 - 1)) != 0) {
         ar.hold += (unsigned long)*ar.in++ << ar.bits;
         ar.bits += 8;
     }
 
-#if defined( __GNUC__ ) || defined( __ICC )
+#if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )
+    __asm__ __volatile__ (
+"        leaq    %0, %%rax\n"
+"        movq    %%rbp, 8(%%rax)\n"       /* save regs rbp and rsp */
+"        movq    %%rsp, (%%rax)\n"
+"        movq    %%rax, %%rsp\n"          /* make rsp point to &ar */
+"        movq    16(%%rsp), %%rsi\n"      /* rsi  = in */
+"        movq    32(%%rsp), %%rdi\n"      /* rdi  = out */
+"        movq    24(%%rsp), %%r9\n"       /* r9   = last */
+"        movq    48(%%rsp), %%r10\n"      /* r10  = end */
+"        movq    64(%%rsp), %%rbp\n"      /* rbp  = lcode */
+"        movq    72(%%rsp), %%r11\n"      /* r11  = dcode */
+"        movq    80(%%rsp), %%rdx\n"      /* rdx  = hold */
+"        movl    88(%%rsp), %%ebx\n"      /* ebx  = bits */
+"        movl    100(%%rsp), %%r12d\n"    /* r12d = lmask */
+"        movl    104(%%rsp), %%r13d\n"    /* r13d = dmask */
+                                          /* r14d = len */
+                                          /* r15d = dist */
+"        cld\n"
+"        cmpq    %%rdi, %%r10\n"
+"        je      .L_one_time\n"           /* if only one decode left */
+"        cmpq    %%rsi, %%r9\n"
+"        je      .L_one_time\n"
+"        jmp     .L_do_loop\n"
+
+".L_one_time:\n"
+"        movq    %%r12, %%r8\n"           /* r8 = lmask */
+"        cmpb    $32, %%bl\n"
+"        ja      .L_get_length_code_one_time\n"
+
+"        lodsl\n"                         /* eax = *(uint *)in++ */
+"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
+"        addb    $32, %%bl\n"             /* bits += 32 */
+"        shlq    %%cl, %%rax\n"
+"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */
+"        jmp     .L_get_length_code_one_time\n"
+
+".align 32,0x90\n"
+".L_while_test:\n"
+"        cmpq    %%rdi, %%r10\n"
+"        jbe     .L_break_loop\n"
+"        cmpq    %%rsi, %%r9\n"
+"        jbe     .L_break_loop\n"
+
+".L_do_loop:\n"
+"        movq    %%r12, %%r8\n"           /* r8 = lmask */
+"        cmpb    $32, %%bl\n"
+"        ja      .L_get_length_code\n"    /* if (32 < bits) */
+
+"        lodsl\n"                         /* eax = *(uint *)in++ */
+"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
+"        addb    $32, %%bl\n"             /* bits += 32 */
+"        shlq    %%cl, %%rax\n"
+"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */
+
+".L_get_length_code:\n"
+"        andq    %%rdx, %%r8\n"            /* r8 &= hold */
+"        movl    (%%rbp,%%r8,4), %%eax\n"  /* eax = lcode[hold & lmask] */
+
+"        movb    %%ah, %%cl\n"            /* cl = this.bits */
+"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
+"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */
+
+"        testb   %%al, %%al\n"
+"        jnz     .L_test_for_length_base\n" /* if (op != 0) 45.7% */
+
+"        movq    %%r12, %%r8\n"            /* r8 = lmask */
+"        shrl    $16, %%eax\n"            /* output this.val char */
+"        stosb\n"
+
+".L_get_length_code_one_time:\n"
+"        andq    %%rdx, %%r8\n"            /* r8 &= hold */
+"        movl    (%%rbp,%%r8,4), %%eax\n" /* eax = lcode[hold & lmask] */
+
+".L_dolen:\n"
+"        movb    %%ah, %%cl\n"            /* cl = this.bits */
+"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
+"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */
+
+"        testb   %%al, %%al\n"
+"        jnz     .L_test_for_length_base\n" /* if (op != 0) 45.7% */
+
+"        shrl    $16, %%eax\n"            /* output this.val char */
+"        stosb\n"
+"        jmp     .L_while_test\n"
+
+".align 32,0x90\n"
+".L_test_for_length_base:\n"
+"        movl    %%eax, %%r14d\n"         /* len = this */
+"        shrl    $16, %%r14d\n"           /* len = this.val */
+"        movb    %%al, %%cl\n"
+
+"        testb   $16, %%al\n"
+"        jz      .L_test_for_second_level_length\n" /* if ((op & 16) == 0) 8% */
+"        andb    $15, %%cl\n"             /* op &= 15 */
+"        jz      .L_decode_distance\n"    /* if (!op) */
+
+".L_add_bits_to_len:\n"
+"        subb    %%cl, %%bl\n"
+"        xorl    %%eax, %%eax\n"
+"        incl    %%eax\n"
+"        shll    %%cl, %%eax\n"
+"        decl    %%eax\n"
+"        andl    %%edx, %%eax\n"          /* eax &= hold */
+"        shrq    %%cl, %%rdx\n"
+"        addl    %%eax, %%r14d\n"         /* len += hold & mask[op] */
+
+".L_decode_distance:\n"
+"        movq    %%r13, %%r8\n"           /* r8 = dmask */
+"        cmpb    $32, %%bl\n"
+"        ja      .L_get_distance_code\n"  /* if (32 < bits) */
+
+"        lodsl\n"                         /* eax = *(uint *)in++ */
+"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
+"        addb    $32, %%bl\n"             /* bits += 32 */
+"        shlq    %%cl, %%rax\n"
+"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */
+
+".L_get_distance_code:\n"
+"        andq    %%rdx, %%r8\n"           /* r8 &= hold */
+"        movl    (%%r11,%%r8,4), %%eax\n" /* eax = dcode[hold & dmask] */
+
+".L_dodist:\n"
+"        movl    %%eax, %%r15d\n"         /* dist = this */
+"        shrl    $16, %%r15d\n"           /* dist = this.val */
+"        movb    %%ah, %%cl\n"
+"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
+"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */
+"        movb    %%al, %%cl\n"            /* cl = this.op */
+
+"        testb   $16, %%al\n"             /* if ((op & 16) == 0) */
+"        jz      .L_test_for_second_level_dist\n"
+"        andb    $15, %%cl\n"             /* op &= 15 */
+"        jz      .L_check_dist_one\n"
+
+".L_add_bits_to_dist:\n"
+"        subb    %%cl, %%bl\n"
+"        xorl    %%eax, %%eax\n"
+"        incl    %%eax\n"
+"        shll    %%cl, %%eax\n"
+"        decl    %%eax\n"                 /* (1 << op) - 1 */
+"        andl    %%edx, %%eax\n"          /* eax &= hold */
+"        shrq    %%cl, %%rdx\n"
+"        addl    %%eax, %%r15d\n"         /* dist += hold & ((1 << op) - 1) */
+
+".L_check_window:\n"
+"        movq    %%rsi, %%r8\n"           /* save in so from can use it's reg */
+"        movq    %%rdi, %%rax\n"
+"        subq    40(%%rsp), %%rax\n"      /* nbytes = out - beg */
+
+"        cmpl    %%r15d, %%eax\n"
+"        jb      .L_clip_window\n"        /* if (dist > nbytes) 4.2% */
+
+"        movl    %%r14d, %%ecx\n"         /* ecx = len */
+"        movq    %%rdi, %%rsi\n"
+"        subq    %%r15, %%rsi\n"          /* from = out - dist */
+
+"        sarl    %%ecx\n"
+"        jnc     .L_copy_two\n"           /* if len % 2 == 0 */
+
+"        rep     movsw\n"
+"        movb    (%%rsi), %%al\n"
+"        movb    %%al, (%%rdi)\n"
+"        incq    %%rdi\n"
+
+"        movq    %%r8, %%rsi\n"           /* move in back to %rsi, toss from */
+"        jmp     .L_while_test\n"
+
+".L_copy_two:\n"
+"        rep     movsw\n"
+"        movq    %%r8, %%rsi\n"           /* move in back to %rsi, toss from */
+"        jmp     .L_while_test\n"
+
+".align 32,0x90\n"
+".L_check_dist_one:\n"
+"        cmpl    $1, %%r15d\n"            /* if dist 1, is a memset */
+"        jne     .L_check_window\n"
+"        cmpq    %%rdi, 40(%%rsp)\n"      /* if out == beg, outside window */
+"        je      .L_check_window\n"
+
+"        movl    %%r14d, %%ecx\n"         /* ecx = len */
+"        movb    -1(%%rdi), %%al\n"
+"        movb    %%al, %%ah\n"
+
+"        sarl    %%ecx\n"
+"        jnc     .L_set_two\n"
+"        movb    %%al, (%%rdi)\n"
+"        incq    %%rdi\n"
+
+".L_set_two:\n"
+"        rep     stosw\n"
+"        jmp     .L_while_test\n"
+
+".align 32,0x90\n"
+".L_test_for_second_level_length:\n"
+"        testb   $64, %%al\n"
+"        jnz     .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */
+
+"        xorl    %%eax, %%eax\n"
+"        incl    %%eax\n"
+"        shll    %%cl, %%eax\n"
+"        decl    %%eax\n"
+"        andl    %%edx, %%eax\n"         /* eax &= hold */
+"        addl    %%r14d, %%eax\n"        /* eax += len */
+"        movl    (%%rbp,%%rax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/
+"        jmp     .L_dolen\n"
+
+".align 32,0x90\n"
+".L_test_for_second_level_dist:\n"
+"        testb   $64, %%al\n"
+"        jnz     .L_invalid_distance_code\n" /* if ((op & 64) != 0) */
+
+"        xorl    %%eax, %%eax\n"
+"        incl    %%eax\n"
+"        shll    %%cl, %%eax\n"
+"        decl    %%eax\n"
+"        andl    %%edx, %%eax\n"         /* eax &= hold */
+"        addl    %%r15d, %%eax\n"        /* eax += dist */
+"        movl    (%%r11,%%rax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/
+"        jmp     .L_dodist\n"
+
+".align 32,0x90\n"
+".L_clip_window:\n"
+"        movl    %%eax, %%ecx\n"         /* ecx = nbytes */
+"        movl    92(%%rsp), %%eax\n"     /* eax = wsize, prepare for dist cmp */
+"        negl    %%ecx\n"                /* nbytes = -nbytes */
+
+"        cmpl    %%r15d, %%eax\n"
+"        jb      .L_invalid_distance_too_far\n" /* if (dist > wsize) */
+
+"        addl    %%r15d, %%ecx\n"         /* nbytes = dist - nbytes */
+"        cmpl    $0, 96(%%rsp)\n"
+"        jne     .L_wrap_around_window\n" /* if (write != 0) */
+
+"        movq    56(%%rsp), %%rsi\n"     /* from  = window */
+"        subl    %%ecx, %%eax\n"         /* eax  -= nbytes */
+"        addq    %%rax, %%rsi\n"         /* from += wsize - nbytes */
+
+"        movl    %%r14d, %%eax\n"        /* eax = len */
+"        cmpl    %%ecx, %%r14d\n"
+"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
+
+"        subl    %%ecx, %%eax\n"         /* eax -= nbytes */
+"        rep     movsb\n"
+"        movq    %%rdi, %%rsi\n"
+"        subq    %%r15, %%rsi\n"         /* from = &out[ -dist ] */
+"        jmp     .L_do_copy\n"
+
+".align 32,0x90\n"
+".L_wrap_around_window:\n"
+"        movl    96(%%rsp), %%eax\n"     /* eax = write */
+"        cmpl    %%eax, %%ecx\n"
+"        jbe     .L_contiguous_in_window\n" /* if (write >= nbytes) */
+
+"        movl    92(%%rsp), %%esi\n"     /* from  = wsize */
+"        addq    56(%%rsp), %%rsi\n"     /* from += window */
+"        addq    %%rax, %%rsi\n"         /* from += write */
+"        subq    %%rcx, %%rsi\n"         /* from -= nbytes */
+"        subl    %%eax, %%ecx\n"         /* nbytes -= write */
+
+"        movl    %%r14d, %%eax\n"        /* eax = len */
+"        cmpl    %%ecx, %%eax\n"
+"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
+
+"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
+"        rep     movsb\n"
+"        movq    56(%%rsp), %%rsi\n"     /* from = window */
+"        movl    96(%%rsp), %%ecx\n"     /* nbytes = write */
+"        cmpl    %%ecx, %%eax\n"
+"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
+
+"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
+"        rep     movsb\n"
+"        movq    %%rdi, %%rsi\n"
+"        subq    %%r15, %%rsi\n"         /* from = out - dist */
+"        jmp     .L_do_copy\n"
+
+".align 32,0x90\n"
+".L_contiguous_in_window:\n"
+"        movq    56(%%rsp), %%rsi\n"     /* rsi = window */
+"        addq    %%rax, %%rsi\n"
+"        subq    %%rcx, %%rsi\n"         /* from += write - nbytes */
+
+"        movl    %%r14d, %%eax\n"        /* eax = len */
+"        cmpl    %%ecx, %%eax\n"
+"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
+
+"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
+"        rep     movsb\n"
+"        movq    %%rdi, %%rsi\n"
+"        subq    %%r15, %%rsi\n"         /* from = out - dist */
+"        jmp     .L_do_copy\n"           /* if (nbytes >= len) */
+
+".align 32,0x90\n"
+".L_do_copy:\n"
+"        movl    %%eax, %%ecx\n"         /* ecx = len */
+"        rep     movsb\n"
+
+"        movq    %%r8, %%rsi\n"          /* move in back to %esi, toss from */
+"        jmp     .L_while_test\n"
+
+".L_test_for_end_of_block:\n"
+"        testb   $32, %%al\n"
+"        jz      .L_invalid_literal_length_code\n"
+"        movl    $1, 116(%%rsp)\n"
+"        jmp     .L_break_loop_with_status\n"
+
+".L_invalid_literal_length_code:\n"
+"        movl    $2, 116(%%rsp)\n"
+"        jmp     .L_break_loop_with_status\n"
+
+".L_invalid_distance_code:\n"
+"        movl    $3, 116(%%rsp)\n"
+"        jmp     .L_break_loop_with_status\n"
+
+".L_invalid_distance_too_far:\n"
+"        movl    $4, 116(%%rsp)\n"
+"        jmp     .L_break_loop_with_status\n"
+
+".L_break_loop:\n"
+"        movl    $0, 116(%%rsp)\n"
+
+".L_break_loop_with_status:\n"
+/* put in, out, bits, and hold back into ar and pop esp */
+"        movq    %%rsi, 16(%%rsp)\n"     /* in */
+"        movq    %%rdi, 32(%%rsp)\n"     /* out */
+"        movl    %%ebx, 88(%%rsp)\n"     /* bits */
+"        movq    %%rdx, 80(%%rsp)\n"     /* hold */
+"        movq    (%%rsp), %%rax\n"       /* restore rbp and rsp */
+"        movq    8(%%rsp), %%rbp\n"
+"        movq    %%rax, %%rsp\n"
+          :
+          : "m" (ar)
+          : "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi",
+            "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15"
+    );
+#elif ( defined( __GNUC__ ) || defined( __ICC ) ) && defined( __i386 )
     __asm__ __volatile__ (
 "        leal    %0, %%eax\n"
-"        pushf\n"
-"        pushl   %%ebp\n"
-"        movl    %%esp, (%%eax)\n"
+"        movl    %%esp, (%%eax)\n"        /* save esp, ebp */
+"        movl    %%ebp, 4(%%eax)\n"
 "        movl    %%eax, %%esp\n"
-"        movl    4(%%esp), %%esi\n"       /* esi = in */
-"        movl    12(%%esp), %%edi\n"      /* edi = out */
-"        movl    36(%%esp), %%edx\n"      /* edx = hold */
-"        movl    40(%%esp), %%ebx\n"      /* ebx = bits */
-"        movl    44(%%esp), %%ebp\n"      /* ebp = lcode */
+"        movl    8(%%esp), %%esi\n"       /* esi = in */
+"        movl    16(%%esp), %%edi\n"      /* edi = out */
+"        movl    40(%%esp), %%edx\n"      /* edx = hold */
+"        movl    44(%%esp), %%ebx\n"      /* ebx = bits */
+"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
 
 "        cld\n"
 "        jmp     .L_do_loop\n"
 
+".align 32,0x90\n"
 ".L_while_test:\n"
-"        cmpl    %%edi, 20(%%esp)\n"
+"        cmpl    %%edi, 24(%%esp)\n"      /* out < end */
 "        jbe     .L_break_loop\n"
-"        cmpl    %%esi, 8(%%esp)\n"
+"        cmpl    %%esi, 12(%%esp)\n"      /* in < last */
 "        jbe     .L_break_loop\n"
 
 ".L_do_loop:\n"
@@ -145,7 +501,7 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
 "        orl     %%eax, %%edx\n"        /* hold |= *((ushort *)in)++ << bits */
 
 ".L_get_length_code:\n"
-"        movl    52(%%esp), %%eax\n"      /* eax = lmask */
+"        movl    56(%%esp), %%eax\n"      /* eax = lmask */
 "        andl    %%edx, %%eax\n"          /* eax &= hold */
 "        movl    (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[hold & lmask] */
 
@@ -161,10 +517,11 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
 "        stosb\n"
 "        jmp     .L_while_test\n"
 
+".align 32,0x90\n"
 ".L_test_for_length_base:\n"
 "        movl    %%eax, %%ecx\n"          /* len = this */
 "        shrl    $16, %%ecx\n"            /* len = this.val */
-"        movl    %%ecx, 60(%%esp)\n"      /* len = this */
+"        movl    %%ecx, 64(%%esp)\n"      /* save len */
 "        movb    %%al, %%cl\n"
 
 "        testb   $16, %%al\n"
@@ -184,13 +541,14 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
 "        movb    %%ch, %%cl\n"            /* move op back to ecx */
 
 ".L_add_bits_to_len:\n"
-"        movl    $1, %%eax\n"
+"        subb    %%cl, %%bl\n"
+"        xorl    %%eax, %%eax\n"
+"        incl    %%eax\n"
 "        shll    %%cl, %%eax\n"
 "        decl    %%eax\n"
-"        subb    %%cl, %%bl\n"
 "        andl    %%edx, %%eax\n"          /* eax &= hold */
 "        shrl    %%cl, %%edx\n"
-"        addl    %%eax, 60(%%esp)\n"      /* len += hold & mask[op] */
+"        addl    %%eax, 64(%%esp)\n"      /* len += hold & mask[op] */
 
 ".L_decode_distance:\n"
 "        cmpb    $15, %%bl\n"
@@ -204,8 +562,8 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
 "        orl     %%eax, %%edx\n"         /* hold |= *((ushort *)in)++ << bits */
 
 ".L_get_distance_code:\n"
-"        movl    56(%%esp), %%eax\n"      /* eax = dmask */
-"        movl    48(%%esp), %%ecx\n"      /* ecx = dcode */
+"        movl    60(%%esp), %%eax\n"      /* eax = dmask */
+"        movl    36(%%esp), %%ecx\n"      /* ecx = dcode */
 "        andl    %%edx, %%eax\n"          /* eax &= hold */
 "        movl    (%%ecx,%%eax,4), %%eax\n"/* eax = dcode[hold & dmask] */
 
@@ -234,223 +592,228 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
 "        movb    %%ch, %%cl\n"            /* move op back to ecx */
 
 ".L_add_bits_to_dist:\n"
-"        movl    $1, %%eax\n"
+"        subb    %%cl, %%bl\n"
+"        xorl    %%eax, %%eax\n"
+"        incl    %%eax\n"
 "        shll    %%cl, %%eax\n"
 "        decl    %%eax\n"                 /* (1 << op) - 1 */
-"        subb    %%cl, %%bl\n"
 "        andl    %%edx, %%eax\n"          /* eax &= hold */
 "        shrl    %%cl, %%edx\n"
 "        addl    %%eax, %%ebp\n"          /* dist += hold & ((1 << op) - 1) */
 
 ".L_check_window:\n"
-"        movl    %%esi, 4(%%esp)\n"       /* save in so from can use it's reg */
+"        movl    %%esi, 8(%%esp)\n"       /* save in so from can use it's reg */
 "        movl    %%edi, %%eax\n"
-"        subl    16(%%esp), %%eax\n"      /* nbytes = out - beg */
+"        subl    20(%%esp), %%eax\n"      /* nbytes = out - beg */
 
 "        cmpl    %%ebp, %%eax\n"
 "        jb      .L_clip_window\n"        /* if (dist > nbytes) 4.2% */
 
-"        movl    60(%%esp), %%ecx\n"
+"        movl    64(%%esp), %%ecx\n"      /* ecx = len */
 "        movl    %%edi, %%esi\n"
 "        subl    %%ebp, %%esi\n"          /* from = out - dist */
 
-"        subl    $3, %%ecx\n"             /* copy from to out */
+"        sarl    %%ecx\n"
+"        jnc     .L_copy_two\n"           /* if len % 2 == 0 */
+
+"        rep     movsw\n"
 "        movb    (%%esi), %%al\n"
 "        movb    %%al, (%%edi)\n"
-"        movb    1(%%esi), %%al\n"
-"        movb    2(%%esi), %%ah\n"
-"        addl    $3, %%esi\n"
-"        movb    %%al, 1(%%edi)\n"
-"        movb    %%ah, 2(%%edi)\n"
-"        addl    $3, %%edi\n"
-"        rep     movsb\n"
+"        incl    %%edi\n"
 
-"        movl    4(%%esp), %%esi\n"      /* move in back to %esi, toss from */
-"        movl    44(%%esp), %%ebp\n"     /* ebp = lcode */
+"        movl    8(%%esp), %%esi\n"       /* move in back to %esi, toss from */
+"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
 "        jmp     .L_while_test\n"
 
+".L_copy_two:\n"
+"        rep     movsw\n"
+"        movl    8(%%esp), %%esi\n"       /* move in back to %esi, toss from */
+"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
+"        jmp     .L_while_test\n"
+
+".align 32,0x90\n"
 ".L_check_dist_one:\n"
 "        cmpl    $1, %%ebp\n"            /* if dist 1, is a memset */
 "        jne     .L_check_window\n"
-"        cmpl    %%edi, 16(%%esp)\n"
-"        je      .L_check_window\n"
+"        cmpl    %%edi, 20(%%esp)\n"
+"        je      .L_check_window\n"      /* out == beg, if outside window */
+
+"        movl    64(%%esp), %%ecx\n"      /* ecx = len */
+"        movb    -1(%%edi), %%al\n"
+"        movb    %%al, %%ah\n"
+
+"        sarl    %%ecx\n"
+"        jnc     .L_set_two\n"
+"        movb    %%al, (%%edi)\n"
+"        incl    %%edi\n"
 
-"        decl    %%edi\n"
-"        movl    60(%%esp), %%ecx\n"
-"        movb    (%%edi), %%al\n"
-"        subl    $3, %%ecx\n"
-
-"        movb    %%al, 1(%%edi)\n"       /* memset out with from[-1] */
-"        movb    %%al, 2(%%edi)\n"
-"        movb    %%al, 3(%%edi)\n"
-"        addl    $4, %%edi\n"
-"        rep     stosb\n"
-"        movl    44(%%esp), %%ebp\n"      /* ebp = lcode */
+".L_set_two:\n"
+"        rep     stosw\n"
+"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
 "        jmp     .L_while_test\n"
 
+".align 32,0x90\n"
 ".L_test_for_second_level_length:\n"
 "        testb   $64, %%al\n"
 "        jnz     .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */
 
-"        movl    $1, %%eax\n"
+"        xorl    %%eax, %%eax\n"
+"        incl    %%eax\n"
 "        shll    %%cl, %%eax\n"
 "        decl    %%eax\n"
 "        andl    %%edx, %%eax\n"         /* eax &= hold */
-"        addl    60(%%esp), %%eax\n"     /* eax += this.val */
+"        addl    64(%%esp), %%eax\n"     /* eax += len */
 "        movl    (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/
 "        jmp     .L_dolen\n"
 
+".align 32,0x90\n"
 ".L_test_for_second_level_dist:\n"
 "        testb   $64, %%al\n"
 "        jnz     .L_invalid_distance_code\n" /* if ((op & 64) != 0) */
 
-"        movl    $1, %%eax\n"
+"        xorl    %%eax, %%eax\n"
+"        incl    %%eax\n"
 "        shll    %%cl, %%eax\n"
 "        decl    %%eax\n"
 "        andl    %%edx, %%eax\n"         /* eax &= hold */
-"        addl    %%ebp, %%eax\n"         /* eax += this.val */
-"        movl    48(%%esp), %%ecx\n"     /* ecx = dcode */
+"        addl    %%ebp, %%eax\n"         /* eax += dist */
+"        movl    36(%%esp), %%ecx\n"     /* ecx = dcode */
 "        movl    (%%ecx,%%eax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/
 "        jmp     .L_dodist\n"
 
+".align 32,0x90\n"
 ".L_clip_window:\n"
 "        movl    %%eax, %%ecx\n"
-"        movl    24(%%esp), %%eax\n"     /* prepare for dist compare */
+"        movl    48(%%esp), %%eax\n"     /* eax = wsize */
 "        negl    %%ecx\n"                /* nbytes = -nbytes */
-"        movl    32(%%esp), %%esi\n"     /* from = window */
+"        movl    28(%%esp), %%esi\n"     /* from = window */
 
 "        cmpl    %%ebp, %%eax\n"
 "        jb      .L_invalid_distance_too_far\n" /* if (dist > wsize) */
 
 "        addl    %%ebp, %%ecx\n"         /* nbytes = dist - nbytes */
-"        cmpl    $0, 28(%%esp)\n"
+"        cmpl    $0, 52(%%esp)\n"
 "        jne     .L_wrap_around_window\n" /* if (write != 0) */
 
 "        subl    %%ecx, %%eax\n"
 "        addl    %%eax, %%esi\n"         /* from += wsize - nbytes */
 
-"        movl    60(%%esp), %%eax\n"
-"        cmpl    %%ecx, %%eax\n"
-"        jbe     .L_do_copy1\n"          /* if (nbytes >= len) */
-
-"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
-"        rep     movsb\n"
-"        movl    %%edi, %%esi\n"
-"        subl    %%ebp, %%esi\n"         /* from = out - dist */
-"        jmp     .L_do_copy1\n"
-
+"        movl    64(%%esp), %%eax\n"     /* eax = len */
 "        cmpl    %%ecx, %%eax\n"
-"        jbe     .L_do_copy1\n"          /* if (nbytes >= len) */
+"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
 
 "        subl    %%ecx, %%eax\n"         /* len -= nbytes */
 "        rep     movsb\n"
 "        movl    %%edi, %%esi\n"
 "        subl    %%ebp, %%esi\n"         /* from = out - dist */
-"        jmp     .L_do_copy1\n"
+"        jmp     .L_do_copy\n"
 
+".align 32,0x90\n"
 ".L_wrap_around_window:\n"
-"        movl    28(%%esp), %%eax\n"
+"        movl    52(%%esp), %%eax\n"     /* eax = write */
 "        cmpl    %%eax, %%ecx\n"
 "        jbe     .L_contiguous_in_window\n" /* if (write >= nbytes) */
 
-"        addl    24(%%esp), %%esi\n"
-"        addl    %%eax, %%esi\n"
-"        subl    %%ecx, %%esi\n"         /* from += wsize + write - nbytes */
+"        addl    48(%%esp), %%esi\n"     /* from += wsize */
+"        addl    %%eax, %%esi\n"         /* from += write */
+"        subl    %%ecx, %%esi\n"         /* from -= nbytes */
 "        subl    %%eax, %%ecx\n"         /* nbytes -= write */
 
-"        movl    60(%%esp), %%eax\n"
+"        movl    64(%%esp), %%eax\n"     /* eax = len */
 "        cmpl    %%ecx, %%eax\n"
-"        jbe     .L_do_copy1\n"          /* if (nbytes >= len) */
+"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
 
 "        subl    %%ecx, %%eax\n"         /* len -= nbytes */
 "        rep     movsb\n"
-"        movl    32(%%esp), %%esi\n"     /* from = window */
-"        movl    28(%%esp), %%ecx\n"     /* nbytes = write */
+"        movl    28(%%esp), %%esi\n"     /* from = window */
+"        movl    52(%%esp), %%ecx\n"     /* nbytes = write */
 "        cmpl    %%ecx, %%eax\n"
-"        jbe     .L_do_copy1\n"          /* if (nbytes >= len) */
+"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
 
 "        subl    %%ecx, %%eax\n"         /* len -= nbytes */
 "        rep     movsb\n"
 "        movl    %%edi, %%esi\n"
 "        subl    %%ebp, %%esi\n"         /* from = out - dist */
-"        jmp     .L_do_copy1\n"
+"        jmp     .L_do_copy\n"
 
+".align 32,0x90\n"
 ".L_contiguous_in_window:\n"
 "        addl    %%eax, %%esi\n"
 "        subl    %%ecx, %%esi\n"         /* from += write - nbytes */
 
-"        movl    60(%%esp), %%eax\n"
+"        movl    64(%%esp), %%eax\n"     /* eax = len */
 "        cmpl    %%ecx, %%eax\n"
-"        jbe     .L_do_copy1\n"          /* if (nbytes >= len) */
+"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
 
 "        subl    %%ecx, %%eax\n"         /* len -= nbytes */
 "        rep     movsb\n"
 "        movl    %%edi, %%esi\n"
 "        subl    %%ebp, %%esi\n"         /* from = out - dist */
+"        jmp     .L_do_copy\n"           /* if (nbytes >= len) */
 
-".L_do_copy1:\n"
+".align 32,0x90\n"
+".L_do_copy:\n"
 "        movl    %%eax, %%ecx\n"
 "        rep     movsb\n"
 
-"        movl    4(%%esp), %%esi\n"      /* move in back to %esi, toss from */
-"        movl    44(%%esp), %%ebp\n"     /* ebp = lcode */
+"        movl    8(%%esp), %%esi\n"      /* move in back to %esi, toss from */
+"        movl    32(%%esp), %%ebp\n"     /* ebp = lcode */
 "        jmp     .L_while_test\n"
 
 ".L_test_for_end_of_block:\n"
 "        testb   $32, %%al\n"
 "        jz      .L_invalid_literal_length_code\n"
-"        movl    $1, 68(%%esp)\n"
+"        movl    $1, 72(%%esp)\n"
 "        jmp     .L_break_loop_with_status\n"
 
 ".L_invalid_literal_length_code:\n"
-"        movl    $2, 68(%%esp)\n"
+"        movl    $2, 72(%%esp)\n"
 "        jmp     .L_break_loop_with_status\n"
 
 ".L_invalid_distance_code:\n"
-"        movl    $3, 68(%%esp)\n"
+"        movl    $3, 72(%%esp)\n"
 "        jmp     .L_break_loop_with_status\n"
 
 ".L_invalid_distance_too_far:\n"
-"        movl    4(%%esp), %%esi\n"
-"        movl    $4, 68(%%esp)\n"
+"        movl    8(%%esp), %%esi\n"
+"        movl    $4, 72(%%esp)\n"
 "        jmp     .L_break_loop_with_status\n"
 
 ".L_break_loop:\n"
-"        movl    $0, 68(%%esp)\n"
+"        movl    $0, 72(%%esp)\n"
 
 ".L_break_loop_with_status:\n"
 /* put in, out, bits, and hold back into ar and pop esp */
-"        movl    %%esi, 4(%%esp)\n"
-"        movl    %%edi, 12(%%esp)\n"
-"        movl    %%ebx, 40(%%esp)\n"
-"        movl    %%edx, 36(%%esp)\n"
+"        movl    %%esi, 8(%%esp)\n"      /* save in */
+"        movl    %%edi, 16(%%esp)\n"     /* save out */
+"        movl    %%ebx, 44(%%esp)\n"     /* save bits */
+"        movl    %%edx, 40(%%esp)\n"     /* save hold */
+"        movl    4(%%esp), %%ebp\n"      /* restore esp, ebp */
 "        movl    (%%esp), %%esp\n"
-"        popl    %%ebp\n"
-"        popf\n"
           :
           : "m" (ar)
           : "memory", "%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi"
     );
-#elif defined( _MSC_VER )
+#elif defined( _MSC_VER ) && ! defined( _M_AMD64 )
     __asm {
         lea     eax, ar
-        pushfd
-        push    ebp
-        mov     [eax], esp
+        mov     [eax], esp         /* save esp, ebp */
+        mov     [eax+4], ebp
         mov     esp, eax
-        mov     esi, [esp+4]       /* esi = in */
-        mov     edi, [esp+12]      /* edi = out */
-        mov     edx, [esp+36]      /* edx = hold */
-        mov     ebx, [esp+40]      /* ebx = bits */
-        mov     ebp, [esp+44]      /* ebp = lcode */
+        mov     esi, [esp+8]       /* esi = in */
+        mov     edi, [esp+16]      /* edi = out */
+        mov     edx, [esp+40]      /* edx = hold */
+        mov     ebx, [esp+44]      /* ebx = bits */
+        mov     ebp, [esp+32]      /* ebp = lcode */
 
         cld
         jmp     L_do_loop
 
+ALIGN 4
 L_while_test:
-        cmp     [esp+20], edi
+        cmp     [esp+24], edi
         jbe     L_break_loop
-        cmp     [esp+8], esi
+        cmp     [esp+12], esi
         jbe     L_break_loop
 
 L_do_loop:
@@ -465,7 +828,7 @@ L_do_loop:
         or      edx, eax        /* hold |= *((ushort *)in)++ << bits */
 
 L_get_length_code:
-        mov     eax, [esp+52]      /* eax = lmask */
+        mov     eax, [esp+56]      /* eax = lmask */
         and     eax, edx          /* eax &= hold */
         mov     eax, [ebp+eax*4] /* eax = lcode[hold & lmask] */
 
@@ -481,10 +844,11 @@ L_dolen:
         stosb
         jmp     L_while_test
 
+ALIGN 4
 L_test_for_length_base:
         mov     ecx, eax          /* len = this */
         shr     ecx, 16            /* len = this.val */
-        mov     [esp+60], ecx      /* len = this */
+        mov     [esp+64], ecx      /* save len */
         mov     cl, al
 
         test    al, 16
@@ -504,13 +868,14 @@ L_test_for_length_base:
         mov     cl, ch            /* move op back to ecx */
 
 L_add_bits_to_len:
-        mov     eax, 1
+        sub     bl, cl
+        xor     eax, eax
+        inc     eax
         shl     eax, cl
         dec     eax
-        sub     bl, cl
         and     eax, edx          /* eax &= hold */
         shr     edx, cl
-        add     [esp+60], eax      /* len += hold & mask[op] */
+        add     [esp+64], eax      /* len += hold & mask[op] */
 
 L_decode_distance:
         cmp     bl, 15
@@ -524,8 +889,8 @@ L_decode_distance:
         or      edx, eax         /* hold |= *((ushort *)in)++ << bits */
 
 L_get_distance_code:
-        mov     eax, [esp+56]      /* eax = dmask */
-        mov     ecx, [esp+48]      /* ecx = dcode */
+        mov     eax, [esp+60]      /* eax = dmask */
+        mov     ecx, [esp+36]      /* ecx = dcode */
         and     eax, edx          /* eax &= hold */
         mov     eax, [ecx+eax*4]/* eax = dcode[hold & dmask] */
 
@@ -554,200 +919,207 @@ L_dodist:
         mov     cl, ch            /* move op back to ecx */
 
 L_add_bits_to_dist:
-        mov     eax, 1
+        sub     bl, cl
+        xor     eax, eax
+        inc     eax
         shl     eax, cl
         dec     eax                 /* (1 << op) - 1 */
-        sub     bl, cl
         and     eax, edx          /* eax &= hold */
         shr     edx, cl
         add     ebp, eax          /* dist += hold & ((1 << op) - 1) */
 
 L_check_window:
-        mov     [esp+4], esi       /* save in so from can use it's reg */
+        mov     [esp+8], esi       /* save in so from can use it's reg */
         mov     eax, edi
-        sub     eax, [esp+16]      /* nbytes = out - beg */
+        sub     eax, [esp+20]      /* nbytes = out - beg */
 
         cmp     eax, ebp
         jb      L_clip_window        /* if (dist > nbytes) 4.2% */
 
-        mov     ecx, [esp+60]
+        mov     ecx, [esp+64]      /* ecx = len */
         mov     esi, edi
         sub     esi, ebp          /* from = out - dist */
 
-        sub     ecx, 3             /* copy from to out */
+        sar     ecx, 1
+        jnc     L_copy_two
+
+        rep     movsw
         mov     al, [esi]
         mov     [edi], al
-        mov     al, [esi+1]
-        mov     ah, [esi+2]
-        add     esi, 3
-        mov     [edi+1], al
-        mov     [edi+2], ah
-        add     edi, 3
-        rep     movsb
+        inc     edi
+
+        mov     esi, [esp+8]      /* move in back to %esi, toss from */
+        mov     ebp, [esp+32]     /* ebp = lcode */
+        jmp     L_while_test
 
-        mov     esi, [esp+4]      /* move in back to %esi, toss from */
-        mov     ebp, [esp+44]     /* ebp = lcode */
+L_copy_two:
+        rep     movsw
+        mov     esi, [esp+8]      /* move in back to %esi, toss from */
+        mov     ebp, [esp+32]     /* ebp = lcode */
         jmp     L_while_test
 
+ALIGN 4
 L_check_dist_one:
         cmp     ebp, 1            /* if dist 1, is a memset */
         jne     L_check_window
-        cmp     [esp+16], edi
-        je      L_check_window
-
-        dec     edi
-        mov     ecx, [esp+60]
-        mov     al, [edi]
-        sub     ecx, 3
-
-        mov     [edi+1], al       /* memset out with from[-1] */
-        mov     [edi+2], al
-        mov     [edi+3], al
-        add     edi, 4
-        rep     stosb
-        mov     ebp, [esp+44]      /* ebp = lcode */
+        cmp     [esp+20], edi
+        je      L_check_window    /* out == beg, if outside window */
+
+        mov     ecx, [esp+64]     /* ecx = len */
+        mov     al, [edi-1]
+        mov     ah, al
+
+        sar     ecx, 1
+        jnc     L_set_two
+        mov     [edi], al         /* memset out with from[-1] */
+        inc     edi
+
+L_set_two:
+        rep     stosw
+        mov     ebp, [esp+32]     /* ebp = lcode */
         jmp     L_while_test
 
+ALIGN 4
 L_test_for_second_level_length:
         test    al, 64
         jnz     L_test_for_end_of_block /* if ((op & 64) != 0) */
 
-        mov     eax, 1
+        xor     eax, eax
+        inc     eax
         shl     eax, cl
         dec     eax
         and     eax, edx         /* eax &= hold */
-        add     eax, [esp+60]     /* eax += this.val */
+        add     eax, [esp+64]     /* eax += len */
         mov     eax, [ebp+eax*4] /* eax = lcode[val+(hold&mask[op])]*/
         jmp     L_dolen
 
+ALIGN 4
 L_test_for_second_level_dist:
         test    al, 64
         jnz     L_invalid_distance_code /* if ((op & 64) != 0) */
 
-        mov     eax, 1
+        xor     eax, eax
+        inc     eax
         shl     eax, cl
         dec     eax
         and     eax, edx         /* eax &= hold */
-        add     eax, ebp         /* eax += this.val */
-        mov     ecx, [esp+48]     /* ecx = dcode */
+        add     eax, ebp         /* eax += dist */
+        mov     ecx, [esp+36]     /* ecx = dcode */
         mov     eax, [ecx+eax*4] /* eax = dcode[val+(hold&mask[op])]*/
         jmp     L_dodist
 
+ALIGN 4
 L_clip_window:
         mov     ecx, eax
-        mov     eax, [esp+24]     /* prepare for dist compare */
+        mov     eax, [esp+48]     /* eax = wsize */
         neg     ecx                /* nbytes = -nbytes */
-        mov     esi, [esp+32]     /* from = window */
+        mov     esi, [esp+28]     /* from = window */
 
         cmp     eax, ebp
         jb      L_invalid_distance_too_far /* if (dist > wsize) */
 
         add     ecx, ebp         /* nbytes = dist - nbytes */
-        cmp     dword ptr [esp+28], 0
+        cmp     dword ptr [esp+52], 0
         jne     L_wrap_around_window /* if (write != 0) */
 
         sub     eax, ecx
         add     esi, eax         /* from += wsize - nbytes */
 
-        mov     eax, [esp+60]
-        cmp     eax, ecx
-        jbe     L_do_copy1          /* if (nbytes >= len) */
-
-        sub     eax, ecx         /* len -= nbytes */
-        rep     movsb
-        mov     esi, edi
-        sub     esi, ebp         /* from = out - dist */
-        jmp     L_do_copy1
-
+        mov     eax, [esp+64]    /* eax = len */
         cmp     eax, ecx
-        jbe     L_do_copy1          /* if (nbytes >= len) */
+        jbe     L_do_copy          /* if (nbytes >= len) */
 
         sub     eax, ecx         /* len -= nbytes */
         rep     movsb
         mov     esi, edi
         sub     esi, ebp         /* from = out - dist */
-        jmp     L_do_copy1
+        jmp     L_do_copy
 
+ALIGN 4
 L_wrap_around_window:
-        mov     eax, [esp+28]
+        mov     eax, [esp+52]    /* eax = write */
         cmp     ecx, eax
         jbe     L_contiguous_in_window /* if (write >= nbytes) */
 
-        add     esi, [esp+24]
-        add     esi, eax
-        sub     esi, ecx         /* from += wsize + write - nbytes */
+        add     esi, [esp+48]    /* from += wsize */
+        add     esi, eax         /* from += write */
+        sub     esi, ecx         /* from -= nbytes */
         sub     ecx, eax         /* nbytes -= write */
 
-        mov     eax, [esp+60]
+        mov     eax, [esp+64]    /* eax = len */
         cmp     eax, ecx
-        jbe     L_do_copy1          /* if (nbytes >= len) */
+        jbe     L_do_copy          /* if (nbytes >= len) */
 
         sub     eax, ecx         /* len -= nbytes */
         rep     movsb
-        mov     esi, [esp+32]     /* from = window */
-        mov     ecx, [esp+28]     /* nbytes = write */
+        mov     esi, [esp+28]     /* from = window */
+        mov     ecx, [esp+52]     /* nbytes = write */
         cmp     eax, ecx
-        jbe     L_do_copy1          /* if (nbytes >= len) */
+        jbe     L_do_copy          /* if (nbytes >= len) */
 
         sub     eax, ecx         /* len -= nbytes */
         rep     movsb
         mov     esi, edi
         sub     esi, ebp         /* from = out - dist */
-        jmp     L_do_copy1
+        jmp     L_do_copy
 
+ALIGN 4
 L_contiguous_in_window:
         add     esi, eax
         sub     esi, ecx         /* from += write - nbytes */
 
-        mov     eax, [esp+60]
+        mov     eax, [esp+64]    /* eax = len */
         cmp     eax, ecx
-        jbe     L_do_copy1          /* if (nbytes >= len) */
+        jbe     L_do_copy          /* if (nbytes >= len) */
 
         sub     eax, ecx         /* len -= nbytes */
         rep     movsb
         mov     esi, edi
         sub     esi, ebp         /* from = out - dist */
+        jmp     L_do_copy
 
-L_do_copy1:
+ALIGN 4
+L_do_copy:
         mov     ecx, eax
         rep     movsb
 
-        mov     esi, [esp+4]      /* move in back to %esi, toss from */
-        mov     ebp, [esp+44]     /* ebp = lcode */
+        mov     esi, [esp+8]      /* move in back to %esi, toss from */
+        mov     ebp, [esp+32]     /* ebp = lcode */
         jmp     L_while_test
 
 L_test_for_end_of_block:
         test    al, 32
         jz      L_invalid_literal_length_code
-        mov     dword ptr [esp+68], 1
+        mov     dword ptr [esp+72], 1
         jmp     L_break_loop_with_status
 
 L_invalid_literal_length_code:
-        mov     dword ptr [esp+68], 2
+        mov     dword ptr [esp+72], 2
         jmp     L_break_loop_with_status
 
 L_invalid_distance_code:
-        mov     dword ptr [esp+68], 3
+        mov     dword ptr [esp+72], 3
         jmp     L_break_loop_with_status
 
 L_invalid_distance_too_far:
         mov     esi, [esp+4]
-        mov     dword ptr [esp+68], 4
+        mov     dword ptr [esp+72], 4
         jmp     L_break_loop_with_status
 
 L_break_loop:
-        mov     dword ptr [esp+68], 0
+        mov     dword ptr [esp+72], 0
 
 L_break_loop_with_status:
 /* put in, out, bits, and hold back into ar and pop esp */
-        mov     [esp+4], esi
-        mov     [esp+12], edi
-        mov     [esp+40], ebx
-        mov     [esp+36], edx
+        mov     [esp+8], esi     /* save in */
+        mov     [esp+16], edi    /* save out */
+        mov     [esp+44], ebx    /* save bits */
+        mov     [esp+40], edx    /* save hold */
+        mov     ebp, [esp+4]     /* restore esp, ebp */
         mov     esp, [esp]
-        pop     ebp
-        popfd
     }
+#else
+#error "x86 architecture not defined"
 #endif
 
     if (ar.status > 1) {
@@ -772,10 +1144,12 @@ L_break_loop_with_status:
     /* update state and return */
     strm->next_in = ar.in;
     strm->next_out = ar.out;
-    strm->avail_in = (unsigned)(ar.in < ar.last ? 5 + (ar.last - ar.in) :
-                                                  5 - (ar.in - ar.last));
-    strm->avail_out = (unsigned)(ar.out < ar.end ? 257 + (ar.end - ar.out) :
-                                                   257 - (ar.out - ar.end));
+    strm->avail_in = (unsigned)(ar.in < ar.last ?
+                                PAD_AVAIL_IN + (ar.last - ar.in) :
+                                PAD_AVAIL_IN - (ar.in - ar.last));
+    strm->avail_out = (unsigned)(ar.out < ar.end ?
+                                 PAD_AVAIL_OUT + (ar.end - ar.out) :
+                                 PAD_AVAIL_OUT - (ar.out - ar.end));
     state->hold = ar.hold;
     state->bits = ar.bits;
     return;