| 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 |
|
|---|
| 42 | void match_init ()
|
|---|
| 43 | {
|
|---|
| 44 | iIsPPro = (((cpudetect32()/0x100)&0xf)>=6) ? 1 : 0;
|
|---|
| 45 | }
|
|---|
| 46 |
|
|---|
| 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)) */
|
|---|
