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jtag: commands: save a pointer to list tail
By saving a pointer to the tail of the list, we don't need to traverse the entire command queue before we're able to append an item to it. With this patch, I see a 10% improvement when using the embedded XDS100v2 on AM437x IDK board to load a 4MiB binary (linux zImage) to DDR with load_image. IOW, we went from ~305kB/sec to ~336kb/sec. Change-Id: Idb55d49f0d0106043374ab520b2f3b6b32f2c50f Signed-off-by:Felipe Balbi <balbi@ti.com> Reviewed-on: http://openocd.zylin.com/2709 Tested-by: jenkins Reviewed-by:
Stian Skjelstad <stian@nixia.no> Reviewed-by:
Daniele Emancipato <daniele12457@hotmail.com> Reviewed-by:
Matthias Welwarsky <matthias@welwarsky.de> Reviewed-by:
Freddie Chopin <freddie.chopin@gmail.com>
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