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[Qemu-devel] [PATCH v2 14/15] qcow2: small math optimization
From: |
Frediano Ziglio |
Subject: |
[Qemu-devel] [PATCH v2 14/15] qcow2: small math optimization |
Date: |
Tue, 9 Aug 2011 09:46:49 +0200 |
Signed-off-by: Frediano Ziglio <address@hidden>
---
block/qcow2-refcount.c | 5 +----
1 files changed, 1 insertions(+), 4 deletions(-)
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 14b2f67..0e31868 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -140,10 +140,7 @@ static unsigned int next_refcount_table_size(BDRVQcowState
*s,
static int in_same_refcount_block(BDRVQcowState *s, uint64_t offset_a,
uint64_t offset_b)
{
- uint64_t block_a = offset_a >> (2 * s->cluster_bits - REFCOUNT_SHIFT);
- uint64_t block_b = offset_b >> (2 * s->cluster_bits - REFCOUNT_SHIFT);
-
- return (block_a == block_b);
+ return !((offset_a ^ offset_b) >> (2 * s->cluster_bits - REFCOUNT_SHIFT));
}
/*
--
1.7.1
- [Qemu-devel] [PATCH v2 04/15] qcow: embed qcow_aio_read_cb into qcow_co_readv and qcow_aio_write_cb into qcow_co_writev, (continued)
- [Qemu-devel] [PATCH v2 04/15] qcow: embed qcow_aio_read_cb into qcow_co_readv and qcow_aio_write_cb into qcow_co_writev, Frediano Ziglio, 2011/08/09
- [Qemu-devel] [PATCH v2 05/15] qcow: remove old #undefined code, Frediano Ziglio, 2011/08/09
- [Qemu-devel] [PATCH v2 06/15] qcow2: removed unused fields, Frediano Ziglio, 2011/08/09
- [Qemu-devel] [PATCH v2 07/15] qcow2: removed cur_nr_sectors field in QCowAIOCB, Frediano Ziglio, 2011/08/09
- [Qemu-devel] [PATCH v2 08/15] qcow2: remove l2meta from QCowAIOCB, Frediano Ziglio, 2011/08/09
- [Qemu-devel] [PATCH v2 09/15] qcow2: remove cluster_offset from QCowAIOCB, Frediano Ziglio, 2011/08/09
- [Qemu-devel] [PATCH v2 11/15] qcow2: reindent and use while before the big jump, Frediano Ziglio, 2011/08/09
- [Qemu-devel] [PATCH v2 10/15] qcow2: remove common from QCowAIOCB, Frediano Ziglio, 2011/08/09
- [Qemu-devel] [PATCH v2 13/15] qcow2: remove memory leak, Frediano Ziglio, 2011/08/09
- [Qemu-devel] [PATCH v2 12/15] qcow2: removed QCowAIOCB entirely, Frediano Ziglio, 2011/08/09
- [Qemu-devel] [PATCH v2 14/15] qcow2: small math optimization,
Frediano Ziglio <=
- [Qemu-devel] [PATCH v2 15/15] qcow2: small optimization, Frediano Ziglio, 2011/08/09
- Re: [Qemu-devel] [PATCH v2 00/15] qcow/qcow2 cleanups, Kevin Wolf, 2011/08/22