On Wed, Apr 3, 2013 at 11:56 PM, Kenneth Graunke <[email protected]>wrote:
> GLBenchmark 2.7's shaders contain conditional blocks like:
>
> if (x) {
> if (y) {
> ...
> }
> }
>
> where the outer conditional's then clause contains exactly one statement
> (the nested if) and there are no else clauses. This can easily be
> optimized into:
>
> if (x && y) {
> ...
> }
>
> This saves a few instructions in GLBenchmark 2.7:
>
> total instructions in shared programs: 11833 -> 11649 (-1.55%)
> instructions in affected programs: 8234 -> 8050 (-2.23%)
>
> It also helps CS:GO slightly (-0.05%/-0.22%). More importantly,
> however, it simplifies the control flow graph, which could enable other
> optimizations.
>
> Signed-off-by: Kenneth Graunke <[email protected]>
>
Reviewed-by: Matt Turner <[email protected]>
Any measurable performance improvement?
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