[Mesa-dev] A few NIR compile time optimisations

[Timothy Arceri]

On 13/2/19 8:47 pm, Timothy Arceri wrote:
> On 13/2/19 8:38 pm, Timothy Arceri wrote:
>> 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.
> 
> If you are interested you can use this [1] shader-db patch to find 
> problem shaders.
> 
> Note: The compile times returned from that patch seem to work most of 
> the time but occasionally it returns negative times so I've obviously 
> got a bug in there somewhere.

This one fixes the bug just in case anyone looks at this:

https://paste.fedoraproject.org/paste/WJQc829CvQRDsD3AAykaKA

> 
> [1] https://paste.fedoraproject.org/paste/WR2mziu3dna0THjneSbuTw
> 
> 
>>
>>>
>>> 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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