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