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