[Mesa-dev] [PATCH] i965/fs: Add pass to rename registers to break live ranges.

[Eric Anholt]

Matt Turner <mattst88 at gmail.com> writes:

> From: Kenneth Graunke <kenneth at whitecape.org>
>
> The pass breaks live ranges of virtual registers by allocating new
> registers when it sees an assignment to a virtual GRF it's already seen
> written.
>
> total instructions in shared programs: 1656292 -> 1651898 (-0.27%)
> instructions in affected programs:     466836 -> 462442 (-0.94%)
> GAINED:                                173
> LOST:                                  3
> ---
> [mattst88]: Perform renaming at control flow level 0, rather than bailing
>             at first sight of control flow.

I think this needs to handle renaming the regs in special[] in
compact_virtual_grfs().  Either that or we *don't* have to actually do
that work and we should drop it from that code, too.
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