[PATCH, ARM] iWMMXT maintenance

[Xinyu Qi]

Hi, Ramana and Joseph,

Thank you for your reviewing! Sorry for the late response.
Before I submit the new modified patch, I want to make something more specific.

> The -mwmmxt option is not acceptable as it stands today.  IIRC the msimd
>   option was the plan long term when we talked about this last. It is a
> good idea to revisit this now that we are finalizing the options /
> multilib rework and the iwmmx port is getting some maintenance.
> 

So I decide to remove the option from my patch.
I plan to submit three patches this time, one for iWMMXt intrinsic maintenance and WMMX pipeline description (no auto-vectorization or address fix containing), another for iWMMXt testsuite, and the third for doc update.
Do you think it's better to split iWMMXt intrinsic maintenance and WMMX pipeline description into two patches? 

> Also based on a quick reading I find that
> 1. The documentation for the new intrinsics added is missing and that
> needs to be contributed along with the documentation to invoke.texi
> about the new options that are being added.

About the documentation, I found there is no iWMMXt intrinsic doc in extend.texi (which only has WMMX built-in function doc instead).With reference to NEON (existing NEON intrinsic doc), should the iWMMXt intrinsic doc be provide or just simply update the WMMX build-in function? Is it possible to postpone the doc patch since it maybe takes a long time to prepare?

> There is a lot of restructuring of pattern names in neon.md. When you
> say you tested arm-linux-gnueabi did you specifically test the neon port
> with your patches applied to be sure that nothing broke there since I
> notice this churn ?

I have tested all the neon test under gcc.target/arm and gcc.target/arm/neon. I prefer holding the WMMX auto-vectorization patch for a while.

> Based on a quick skim of the patch -
> In a number of places I noticed that you have
> For e.g. in your pipeline descriptions .
> ior (eq_attr ("wtype" "waligni")
>      ior (eq_attr ("wtype" "walignr"))
> etc...
> You could rationalize these with 
> eq_attr "wtype" "waligni, walignr" makes these things smaller :)

Thanks for direction! That's really convenient.

Thanks,
Xinyu