[RFC PATCH] aarch64: improve memset

[Richard Henderson]

On 11/07/2014 05:14 PM, Wilco Dijkstra wrote:
> * Do we really need variants for cache line sizes that are never going to be used?
>   I'd say just support 64 and 128, and default higher sizes to no_zva.

We could.

> * Why special case line size=64 only?

Because that was all I could test.

> * Is the no-ifunc variant still required/used? We're now having at least 4 different
>   variants which all need to be tested and maintained...

It's used within ld.so itself, though of course that too could go no_zva.

> * Finally, which version is used when linking statically? I presume there is some 
>   makefile magic that causes the no-zva version to be used, however that might not be 
>   optimal for all targets.

One can have ifuncs in statically linked programs.  They get resolved at
startup; I forget the exact mechanism.


r~