On 04/25/16 14:21, Wilco Dijkstra wrote:
Evandro Menezes wrote:
I assume that you mean that such improvements are true for
-mcpu=generic, yes? On which target, A53 or A57 or other?
It's true for any CPU setting. The SPEC results are for Cortex-A57
however I wrote a microbenchmark that shows improvements on
all targets I have access to. The GCC switch expansion is awful, so
even with a good indirect predictor it is better to use conditional
branches.
I agree with your assessment, but I'm more curious to understand how
this change affects code built with the default -mcpu=generic when run
on both A53 and A57, the typical configuration of big.LITTLE machines.
Thank you,
--
Evandro Menezes
