Commit 04a36158 authored by Max Reitz's avatar Max Reitz Committed by Jeff Cody
Browse files

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: default avatarMax Reitz <mreitz@redhat.com>
Message-id: 1450451066-13335-3-git-send-email-mreitz@redhat.com
Signed-off-by: default avatarJeff Cody <jcody@redhat.com>
parent 939901dc

block/vhdx.c

+4 −4
Original line number Diff line number Diff line
@@ -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);

}



/*