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authorMax Reitz <mreitz@redhat.com>2015-12-18 16:04:26 +0100
committerJeff Cody <jcody@redhat.com>2016-02-29 14:54:31 -0500
commit04a3615860d693cbf5da015ee136a313628a42be (patch)
treed410443d0614124021420fc4686fcd551ab3c174 /block/vhdx.c
parent939901dcd2093a5d6b40420314d1af8b185ec43c (diff)
vhdx: Simplify vhdx_set_shift_bits()
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 <mreitz@redhat.com> Message-id: 1450451066-13335-3-git-send-email-mreitz@redhat.com Signed-off-by: Jeff Cody <jcody@redhat.com>
Diffstat (limited to 'block/vhdx.c')
-rw-r--r--block/vhdx.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/block/vhdx.c b/block/vhdx.c
index 1e7e03ebed..9a51428317 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);
}
/*