[Mesa-dev] A few NIR compile time optimisations

[Timothy Arceri]

On 13/2/19 8:26 pm, Connor Abbott wrote:
> Reviewed-by: Connor Abbott <cwabbott0 at gmail.com 
> <mailto:cwabbott0 at gmail.com>>
> 
> I'm a bit surprised it's that slow... do you have any idea what's going 
> on? I've made flamegraphs in the past on i965 to see where most of the 
> time is spent.

Some shaders are actually faster, but things like the Deus Ex shaders 
(and looks like especially the dolphin uber shaders are slower).

With the  Deus Ex shaders I was looking at we spend 20% in opt_algebraic 
and before this series 7.2% in nir_opt_cse (after this series 4.9%). The 
shaders have lots of operations converting vales to different type etc.

> 
> On Wed, Feb 13, 2019 at 9:00 AM Timothy Arceri <tarceri at itsqueeze.com 
> <mailto:tarceri at itsqueeze.com>> wrote:
> 
>     Currently the radeonsi NIR backend takes around twice the time
>     of the tgsi backend to compile shader-db. These are some first
>     steps at reducing the overhead of NIR.
> 
>     This series reduces the compile time of a Deus Ex program I was
>     profiling by around 5%.
> 
> 
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