Changeset: 0f6ff527560d for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=0f6ff527560d
Modified Files:
gdk/gdk_search.c
Branch: Oct2014
Log Message:
HASHclear(): use memset() instead of for-loop
diffs (39 lines):
diff --git a/gdk/gdk_search.c b/gdk/gdk_search.c
--- a/gdk/gdk_search.c
+++ b/gdk/gdk_search.c
@@ -123,28 +123,13 @@ HASHmask(BUN cnt)
static void
HASHclear(Hash *h)
{
- BUN i, j = h->mask, nil = HASHnil(h);
-
- switch (h->width) {
- case 1:
- for (i = 0; i <= j; i++)
- HASHput1(h, i, nil);
- break;
- case 2:
- for (i = 0; i <= j; i++)
- HASHput2(h, i, nil);
- break;
- case 4:
- for (i = 0; i <= j; i++)
- HASHput4(h, i, nil);
- break;
-#if SIZEOF_BUN == 8
- case 8:
- for (i = 0; i <= j; i++)
- HASHput8(h, i, nil);
- break;
-#endif
- }
+ /* since BUN2_NONE, BUN4_NONE, BUN8_NONE
+ * are all equal to -1 (~0), i.e., have all bits set,
+ * we can use a simple memset() to clear the Hash,
+ * rather than iteratively assigning individual
+ * BUNi_NONE values in a for-loop
+ */
+ memset(h->Hash, 0xFF, (h->mask + 1) * h->width);
}
Hash *
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