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Dmitry Konishchev authored
I run qemu-img under profiler and realized, that most of CPU time is consumed by is_not_zero() function. I had made a couple of optimizations on it and got the following output for `time qemu-img convert -O qcow2 volume.qcow2 snapshot.qcow2`: Original qemu-img: real 0m56.159s user 0m34.670s sys 0m12.079s Patched qemu-img: real 0m34.805s user 0m18.445s sys 0m12.552s Signed-off-by: Dmitry Konishchev <konishchev@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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