On Wed, 8 Sep 2010 15:05:19 +0200, Andi Kleen wrote:
On Wed, 08 Sep 2010 20:57:07 +0800
Miao Xie<miaox@xxxxxxxxxxxxxx> wrote:
On Wed, 8 Sep 2010 14:19:25 +0200 (cest), Andi Kleen wrote:
According to the data, the length of the most copies is>=128.
Thanks for the data. Large is easier to optimize than small, that's
good.
Could you also measure how many memsets need the backwards copy?
^^^^^^^ :-)
(should be easy to add)
I think memset doesn't need the backwards copy.
I meant for memmove of course. Obviously memset doesn't need a backwards
copy. That was just the only thing the script didn't measure because
the original version didn't have memmove support.
memmove
total 5224252
[snip]
forward copy
value |-------------------------------------------------- count
0 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 980253
backward copy
value |-------------------------------------------------- count
0 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 4243999
the backward copy is much more than the forward copy.
Thanks
Miao
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