common/dist/zlib/contrib/masmx86/gvmat32c.c

   1 /*      $NetBSD: gvmat32c.c,v 1.1.1.1 2006/01/14 20:10:56 christos Exp $        */
   2
   3 /* gvmat32.c -- C portion of the optimized longest_match for 32 bits x86
   4  * Copyright (C) 1995-1996 Jean-loup Gailly and Gilles Vollant.
   5  * File written by Gilles Vollant, by modifiying the longest_match
   6  *  from Jean-loup Gailly in deflate.c
   7  *  it prepare all parameters and call the assembly longest_match_gvasm
   8  *  longest_match execute standard C code is wmask != 0x7fff
   9  *     (assembly code is faster with a fixed wmask)
  10  *
  11  * Read comment at beginning of gvmat32.asm for more information
  12  */
  13
  14 #if defined(ASMV) && (!defined(NOOLDPENTIUMCODE))
  15 #include "deflate.h"
  16
  17 /* if your C compiler don't add underline before function name,
  18         define ADD_UNDERLINE_ASMFUNC */
  19 #ifdef ADD_UNDERLINE_ASMFUNC
  20 #define longest_match_7fff _longest_match_7fff
  21 #define longest_match_686  _longest_match_686
  22 #define cpudetect32        _cpudetect32
  23 #endif
  24
  25
  26 unsigned long cpudetect32();
  27
  28 uInt longest_match_c(
  29     deflate_state *s,
  30     IPos cur_match);                             /* current match */
  31
  32
  33 uInt longest_match_7fff(
  34     deflate_state *s,
  35     IPos cur_match);                             /* current match */
  36
  37 uInt longest_match_686(
  38     deflate_state *s,
  39     IPos cur_match);                             /* current match */
  40
  41
  42 static uInt iIsPPro=2;
  43
  44 void match_init ()
  45 {
  46     iIsPPro = (((cpudetect32()/0x100)&0xf)>=6) ? 1 : 0;
  47 }
  48
  49 uInt longest_match(
  50     deflate_state *s,
  51     IPos cur_match)                             /* current match */
  52 {
  53     if (iIsPPro!=0)
  54         return longest_match_686(s,cur_match);
  55
  56     if (s->w_mask != 0x7fff)
  57         return longest_match_686(s,cur_match);
  58
  59     /* now ((s->w_mask == 0x7fff) && (iIsPPro==0)) */
  60         return longest_match_7fff(s,cur_match);
  61 }
  62
  63
  64 #endif /* defined(ASMV) && (!defined(NOOLDPENTIUMCODE)) */