diff options
Diffstat (limited to 'src/backend/utils/mmgr/aset.c')
| -rw-r--r-- | src/backend/utils/mmgr/aset.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/src/backend/utils/mmgr/aset.c b/src/backend/utils/mmgr/aset.c index 718451a2b4f..197f1fcd141 100644 --- a/src/backend/utils/mmgr/aset.c +++ b/src/backend/utils/mmgr/aset.c @@ -11,7 +11,7 @@ * Portions Copyright (c) 1994, Regents of the University of California * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/utils/mmgr/aset.c,v 1.82 2010/01/02 16:57:58 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/utils/mmgr/aset.c,v 1.83 2010/02/26 02:01:14 momjian Exp $ * * NOTE: * This is a new (Feb. 05, 1999) implementation of the allocation set @@ -286,13 +286,13 @@ AllocSetFreeIndex(Size size) tsize = (size - 1) >> ALLOC_MINBITS; /* - * At this point we need to obtain log2(tsize)+1, ie, the number - * of not-all-zero bits at the right. We used to do this with a - * shift-and-count loop, but this function is enough of a hotspot - * to justify micro-optimization effort. The best approach seems - * to be to use a lookup table. Note that this code assumes that - * ALLOCSET_NUM_FREELISTS <= 17, since we only cope with two bytes - * of the tsize value. + * At this point we need to obtain log2(tsize)+1, ie, the number of + * not-all-zero bits at the right. We used to do this with a + * shift-and-count loop, but this function is enough of a hotspot to + * justify micro-optimization effort. The best approach seems to be + * to use a lookup table. Note that this code assumes that + * ALLOCSET_NUM_FREELISTS <= 17, since we only cope with two bytes of + * the tsize value. */ t = tsize >> 8; idx = t ? LogTable256[t] + 8 : LogTable256[tsize]; |