+/* This returns the node for the indicated key, either newly created,
+ * or already existing. */
+static struct idev_node *ihash_node(struct ihash_table *tbl, int64 key)
+{
+ uint32 bkt;
+
+ if (tbl->entries > HASH_LOAD_LIMIT(tbl->size))
+ expand_ihash(tbl);
+
+#if SIZEOF_INT64 < 8
+ /* Based on Jenkins One-at-a-time hash. */
+ {
+ uchar *keyp = (uchar*)&key;
+ int i;
+
+ for (bkt = 0, i = 0; i < SIZEOF_INT64; i++) {
+ bkt += keyp[i];
+ bkt += (bkt << 10);
+ bkt ^= (bkt >> 6);
+ }
+ bkt += (bkt << 3);
+ bkt ^= (bkt >> 11);
+ bkt += (bkt << 15);
+ }
+#else
+#define rot(x,k) (((x)<<(k)) ^ ((x)>>(32-(k))))
+ /* Based on Jenkins hashword() from lookup3.c. */
+ {
+ uint32 a, b, c;
+
+ /* Set up the internal state */
+ a = b = c = 0xdeadbeef + (8 << 2);
+
+ b += (uint32)(key >> 32);
+ a += (uint32)key;
+ c ^= b; c -= rot(b, 14);
+ a ^= c; a -= rot(c, 11);
+ b ^= a; b -= rot(a, 25);
+ c ^= b; c -= rot(b, 16);
+ a ^= c; a -= rot(c, 4);
+ b ^= a; b -= rot(a, 14);
+ c ^= b; c -= rot(b, 24);
+ bkt = c;
+ }