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/* gvmat32.c -- C portion of the optimized longest_match for 32 bits x86
* Copyright (C) 1995-1996 Jean-loup Gailly and Gilles Vollant.
* File written by Gilles Vollant, by modifiying the longest_match
* from Jean-loup Gailly in deflate.c
* it prepare all parameters and call the assembly longest_match_gvasm
* longest_match execute standard C code is wmask != 0x7fff
* (assembly code is faster with a fixed wmask)
*
* Read comment at beginning of gvmat32.asm for more information
*/
#if defined(ASMV) && (!defined(NOOLDPENTIUMCODE))
#include "deflate.h"
/* if your C compiler don't add underline before function name,
define ADD_UNDERLINE_ASMFUNC */
#ifdef ADD_UNDERLINE_ASMFUNC
#define longest_match_7fff _longest_match_7fff
#define longest_match_686 _longest_match_686
#define cpudetect32 _cpudetect32
#endif
unsigned long cpudetect32();
uInt longest_match_c(
deflate_state *s,
IPos cur_match); /* current match */
uInt longest_match_7fff(
deflate_state *s,
IPos cur_match); /* current match */
uInt longest_match_686(
deflate_state *s,
IPos cur_match); /* current match */
static uInt iIsPPro=2;
void match_init ()
{
iIsPPro = (((cpudetect32()/0x100)&0xf)>=6) ? 1 : 0;
}
uInt longest_match(
deflate_state *s,
IPos cur_match) /* current match */
{
if (iIsPPro!=0)
return longest_match_686(s,cur_match);
if (s->w_mask != 0x7fff)
return longest_match_686(s,cur_match);
/* now ((s->w_mask == 0x7fff) && (iIsPPro==0)) */
return longest_match_7fff(s,cur_match);
}
#endif /* defined(ASMV) && (!defined(NOOLDPENTIUMCODE)) */
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20 entries across 20 versions & 3 rubygems