Changeset: f9d401b62051 for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=f9d401b62051
Modified Files:
gdk/gdk_cand.c
Branch: viewless
Log Message:
use memcpy when performing one slice on a cand list
diffs (37 lines):
diff --git a/gdk/gdk_cand.c b/gdk/gdk_cand.c
--- a/gdk/gdk_cand.c
+++ b/gdk/gdk_cand.c
@@ -140,13 +140,19 @@ CANDdoubleslice(BAT *s, BUN l1, BUN h1,
if (bn == NULL)
return NULL;
BATsetcount(bn, h1 - l1 + h2 - l2);
- p = (oid *) Tloc(bn, 0);
- o = (const oid *) Tloc(s, l1);
- while (l1++ < h1)
- *p++ = *o++;
- o = (const oid *) Tloc(s, l2);
- while (l2++ < h2)
- *p++ = *o++;
+ if (l1 == 0 && h1 == 0) {
+ /* explicitly requesting one slice thus using memcpy */
+ memcpy(Tloc(bn, 0), Tloc(s, l2),
+ (h2 - l2) * Tsize(bn));
+ } else {
+ p = (oid *) Tloc(bn, 0);
+ o = (const oid *) Tloc(s, l1);
+ while (l1++ < h1)
+ *p++ = *o++;
+ o = (const oid *) Tloc(s, l2);
+ while (l2++ < h2)
+ *p++ = *o++;
+ }
bn->tkey = 1;
bn->tsorted = 1;
bn->trevsorted = BATcount(bn) <= 1;
@@ -158,6 +164,5 @@ CANDdoubleslice(BAT *s, BUN l1, BUN h1,
BAT *
CANDslice(BAT *s, BUN l, BUN h)
{
- /* TODO: a memcopy might be faster */
return CANDdoubleslice(s, 0, 0, l, h);
}
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