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

[Matt Turner]

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

> register of size 1 and two registers of size 2.

I'm not sure I understand enough yet to review.