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vhdx: Simplify vhdx_set_shift_bits()

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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>
This commit is contained in:
Max Reitz 2015-12-18 16:04:26 +01:00 committed by Jeff Cody
parent 939901dcd2
commit 04a3615860
1 changed files with 4 additions and 4 deletions
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8
block/vhdx.c
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@ -264,10 +264,10 @@ static void vhdx_region_unregister_all(BDRVVHDXState *s)
static void vhdx_set_shift_bits(BDRVVHDXState *s) static void vhdx_set_shift_bits(BDRVVHDXState *s)
{ {
s->logical_sector_size_bits = 31 - clz32(s->logical_sector_size); s->logical_sector_size_bits = ctz32(s->logical_sector_size);
s->sectors_per_block_bits = 31 - clz32(s->sectors_per_block); s->sectors_per_block_bits = ctz32(s->sectors_per_block);
s->chunk_ratio_bits = 63 - clz64(s->chunk_ratio); s->chunk_ratio_bits = ctz64(s->chunk_ratio);
s->block_size_bits = 31 - clz32(s->block_size); s->block_size_bits = ctz32(s->block_size);
} }
/* /*