diff options
Diffstat (limited to 'src/backend')
| -rw-r--r-- | src/backend/utils/mmgr/aset.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/src/backend/utils/mmgr/aset.c b/src/backend/utils/mmgr/aset.c index 740729b5d08..026f5456760 100644 --- a/src/backend/utils/mmgr/aset.c +++ b/src/backend/utils/mmgr/aset.c @@ -289,7 +289,7 @@ AllocSetFreeIndex(Size size) * or equivalently * pg_leftmost_one_pos32(size - 1) - ALLOC_MINBITS + 1 * - * However, rather than just calling that function, we duplicate the + * However, for platforms without intrinsic support, we duplicate the * logic here, allowing an additional optimization. It's reasonable * to assume that ALLOC_CHUNK_LIMIT fits in 16 bits, so we can unroll * the byte-at-a-time loop in pg_leftmost_one_pos32 and just handle @@ -299,8 +299,8 @@ AllocSetFreeIndex(Size size) * much trouble. *---------- */ -#ifdef HAVE__BUILTIN_CLZ - idx = 31 - __builtin_clz((uint32) size - 1) - ALLOC_MINBITS + 1; +#ifdef HAVE_BITSCAN_REVERSE + idx = pg_leftmost_one_pos32((uint32) size - 1) - ALLOC_MINBITS + 1; #else uint32 t, tsize; |