[Mesa-dev] [PATCH 01/10] i965/vs: Add support for simple algebraic optimizations.

[Eric Anholt]

On Fri, 09 Sep 2011 15:21:14 -0700, Kenneth Graunke <kenneth at whitecape.org> wrote:
> On 09/08/2011 11:32 PM, Eric Anholt wrote:
> > + * Does algebraic optimizations (0 * a = 0, 1 * a = a, a + 0 = a).
> 
> I was going to ask "what about commutativity?"...after all, 0 * a but a
> + 0 seems kind of arbitrary...but then I implemented it and tried it on
> shader-db:
> 
> Total instructions: 39967 -> 39967
> 0/137 programs affected (0.0%)
> 
> So, apparently not worth it. :)

Immediates can only appear as the last operand of an instruction.
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