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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2015-03-23 15:29:26 +0000 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2015-04-28 15:36:08 +0200 |
| commit | 786a4ea82ec9c87e3a895cf41081029b285a5fe5 (patch) | |
| tree | fe42f1059c13ea9a27bc9515e5d440d3bb354773 /block/qcow2.c | |
| parent | 5863d374a32c98a7adb4c5e49d62de3cdc16d2ea (diff) | |
| download | qemu-786a4ea82ec9c87e3a895cf41081029b285a5fe5.zip | |
Convert (ffs(val) - 1) to ctz32(val)
This commit was generated mechanically by coccinelle from the following
semantic patch:
@@
expression val;
@@
- (ffs(val) - 1)
+ ctz32(val)
The call sites have been audited to ensure the ffs(0) - 1 == -1 case
never occurs (due to input validation, asserts, etc). Therefore we
don't need to worry about the fact that ctz32(0) == 32.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1427124571-28598-5-git-send-email-stefanha@redhat.com
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/qcow2.c')
| -rw-r--r-- | block/qcow2.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/block/qcow2.c b/block/qcow2.c index 316a8db22b..f692978a6c 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -1802,7 +1802,7 @@ static int qcow2_create2(const char *filename, int64_t total_size, { /* Calculate cluster_bits */ int cluster_bits; - cluster_bits = ffs(cluster_size) - 1; + cluster_bits = ctz32(cluster_size); if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS || (1 << cluster_bits) != cluster_size) { @@ -2110,7 +2110,7 @@ static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp) goto finish; } - refcount_order = ffs(refcount_bits) - 1; + refcount_order = ctz32(refcount_bits); ret = qcow2_create2(filename, size, backing_file, backing_fmt, flags, cluster_size, prealloc, opts, version, refcount_order, |