Viewing file:  scop-15.c (1.58 KB) -rw-r--r--
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# define EXTERN(type, array) extern type array[]
typedef unsigned char uch;
typedef unsigned short ush;
EXTERN(uch, window);
EXTERN(ush, prev);
#ifndef WSIZE
# define WSIZE 0x8000
#endif
#define MIN_MATCH 3
#define MAX_MATCH 258
#define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
#define MAX_DIST (WSIZE-MIN_LOOKAHEAD)
#define near
typedef unsigned IPos;
unsigned near max_chain_length;
extern unsigned near strstart;
unsigned int near prev_length;
#define NIL 0
unsigned near good_match;
int near nice_match;
#define WMASK (WSIZE-1)
int longest_match(IPos cur_match)
{
unsigned chain_length = max_chain_length;
register uch *scan = window + strstart;
register uch *match;
register int len;
int best_len = prev_length;
IPos limit = strstart > (IPos)MAX_DIST ? strstart - (IPos)MAX_DIST : NIL;
register uch *strend = window + strstart + MAX_MATCH;
register uch scan_end = scan[best_len];
if (prev_length >= good_match) {
}
do {
if (match[best_len] != scan_end ||
*++match != scan[1]) continue;
do {
} while (*++scan == *++match && *++scan == *++match &&
scan < strend);
len = MAX_MATCH - (int)(strend - scan);
if (len > best_len) {
best_len = len;
if (len >= nice_match) break;
}
} while ((cur_match = prev[cur_match & WMASK]) > limit
&& --chain_length != 0);
return best_len;
}
/* { dg-final { scan-tree-dump-times "number of SCoPs: 0" 1 "graphite"} } */
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