[Mesa-dev] Flatland

[Erik Faye-Lund]

On Fri, Feb 7, 2014 at 6:34 AM, Connor Abbott <cwabbott0 at gmail.com> wrote:
> - It turns out that the original advantage of a tree-based IR, to be
> able to automatically generate pattern-matching code for optimizing
> certain code patterns, only really matters for CPU's with weird
> instruction sets with lots of exotic instructions; GPU's tend to be
> pretty regular and consistent in their ISA's, so being able to
> pattern-match with trees doesn't help us much here.

>From my understanding this point in Ian's talk wasn't really about
optimizations, but rather about instruction selection. I know at least
one shader compiler architecture where pattern matching optimizations
have paid off quite well, but not necessarily for a tree-based ISA.