Changeset: 70a7395fe4ed for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=70a7395fe4ed
Modified Files:
gdk/gdk_hash.h
Branch: default
Log Message:
Add comments about which values produce NIL as hash value.
diffs (29 lines):
diff --git a/gdk/gdk_hash.h b/gdk/gdk_hash.h
--- a/gdk/gdk_hash.h
+++ b/gdk/gdk_hash.h
@@ -128,12 +128,16 @@ gdk_export BUN HASHlist(Hash *h, BUN i);
} while (0)
#endif
+/* mix_bte(0x80) == 0x80 */
#define mix_bte(X) ((unsigned int) (unsigned char) (X))
+/* mix_sht(0x8000) == 0x8000 */
#define mix_sht(X) ((unsigned int) (unsigned short) (X))
+/* mix_int(0x81060038) == 0x80000000 */
#define mix_int(X) (((unsigned int) (X) >> 7) ^ \
((unsigned int) (X) >> 13) ^ \
((unsigned int) (X) >> 21) ^ \
(unsigned int) (X))
+/* mix_lng(0x810600394347424F) == 0x8000000000000000 */
#define mix_lng(X) (((ulng) (X) >> 7) ^ \
((ulng) (X) >> 13) ^ \
((ulng) (X) >> 21) ^ \
@@ -143,6 +147,8 @@ gdk_export BUN HASHlist(Hash *h, BUN i);
((ulng) (X) >> 56) ^ \
(ulng) (X))
#ifdef HAVE_HGE
+/* mix_hge(0x810600394347424F90AC1429D6BFCC57) ==
+ * 0x80000000000000000000000000000000 */
#define mix_hge(X) (((uhge) (X) >> 7) ^ \
((uhge) (X) >> 13) ^ \
((uhge) (X) >> 21) ^ \
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