From: Max Reitz <mre...@redhat.com>
For values which are powers of two (and we do assume all of these to
be), sizeof(x) * 8 - 1 - clz(x) == ctz(x). Therefore, use ctz().
Signed-off-by: Max Reitz <mre...@redhat.com>
Message-id: 1450451066-13335-3-git-send-email-mre...@redhat.com
Signed-off-by: Jeff Cody <jc...@redhat.com>
---
block/vhdx.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/block/vhdx.c b/block/vhdx.c
index 1e7e03e..9a51428 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -264,10 +264,10 @@ static void vhdx_region_unregister_all(BDRVVHDXState *s)
static void vhdx_set_shift_bits(BDRVVHDXState *s)
{
- s->logical_sector_size_bits = 31 - clz32(s->logical_sector_size);
- s->sectors_per_block_bits = 31 - clz32(s->sectors_per_block);
- s->chunk_ratio_bits = 63 - clz64(s->chunk_ratio);
- s->block_size_bits = 31 - clz32(s->block_size);
+ s->logical_sector_size_bits = ctz32(s->logical_sector_size);
+ s->sectors_per_block_bits = ctz32(s->sectors_per_block);
+ s->chunk_ratio_bits = ctz64(s->chunk_ratio);
+ s->block_size_bits = ctz32(s->block_size);
}
/*
--
1.9.3
