[Mesa-dev] [PATCH 03/12] i965/fs: Rewrite fs_visitor::split_virtual_grfs

[Jason Ekstrand]

On Fri, Sep 19, 2014 at 5:31 PM, Matt Turner <mattst88 at gmail.com> wrote:

> On Fri, Sep 19, 2014 at 1:10 PM, Jason Ekstrand <jason at jlekstrand.net>
> wrote:
> > The original vgrf splitting code was written assuming that with the
> > assumption that vgrfs came in two types: those that can be split into
>
> s/ with the assumption that//
>
> > single registers and those that can't be split at all
>
> Period
>
> > It was very
> > conservative and bailed as soon as more than one element of a register
> was
> > read or written.  This won't work once we start allowing a regular MOV or
> > ADD operation to operate on multiple registers.  This rewrite allows for
> > the case where a vgrf of size 5 may appropreately be split in to one
>
> appropriately
>

Typos fixed.


>
> > register of size 1 and two registers of size 2.
>
> I'm not sure I understand enough yet to review.
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