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* view.c (view_ccache_find): Replaced the linear search with a

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binary search. This speeds up the viewer by a factor of 25 for
	large files (> 100 MB).
This commit is contained in:
Roland Illig 2005-07-07 22:34:31 +00:00
parent ca15b965d6
commit b8969ae3df
2 changed files with 7 additions and 43 deletions
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6
src/ChangeLog
View File

@ -1,3 +1,9 @@
2005-07-07 Roland Illig <roland.illig@gmx.de>
* view.c (view_ccache_find): Replaced the linear search with a
binary search. This speeds up the viewer by a factor of 25 for
large files (> 100 MB).
2005-07-07 Roland Illig <roland.illig@gmx.de>
* dialog.h: Replaced object-like macros with implicit references

44
src/view.c
View File

@ -810,34 +810,7 @@ is_nroff_sequence (WView *view, offset_type offset)
}
static inline guint
view_ccache_find_linear_down (WView *view, const struct coord_cache_entry *cache,
const struct coord_cache_entry *coord, enum ccache_type sort_by)
{
guint i;
for (i = 0; i + 1 < view->coord_cache->len; i++) {
if (coord_cache_entry_less (coord, &(cache[i + 1]), sort_by, view->text_nroff_mode))
break;
}
return i;
}
static inline guint
view_ccache_find_linear_up (WView *view, const struct coord_cache_entry *cache,
const struct coord_cache_entry *coord, enum ccache_type sort_by)
{
guint i;
i = view->coord_cache->len;
assert (i != 0);
do {
i--;
} while (coord_cache_entry_less (coord, &cache[i], sort_by, view->text_nroff_mode));
return i;
}
static inline guint
view_ccache_find_binary (WView *view, const struct coord_cache_entry *cache,
view_ccache_find (WView *view, const struct coord_cache_entry *cache,
const struct coord_cache_entry *coord, enum ccache_type sort_by)
{
guint base, i, limit;
@ -859,21 +832,6 @@ view_ccache_find_binary (WView *view, const struct coord_cache_entry *cache,
return base;
}
static inline guint
view_ccache_find (WView *view, const struct coord_cache_entry *cache,
const struct coord_cache_entry *coord, enum ccache_type sort_by)
{
volatile guint linear_down, linear_up, binary;
linear_down = view_ccache_find_linear_down (view, cache, coord, sort_by);
linear_up = view_ccache_find_linear_up (view, cache, coord, sort_by);
binary = view_ccache_find_binary (view, cache, coord, sort_by);
assert (linear_down == linear_up);
assert (linear_down == binary);
return binary;
}
/* Look up the missing components of ''coord'', which are given by
* ''lookup_what''. The function returns the smallest value that
* matches the existing components of ''coord''.