[Mesa-dev] r600g: status of my work on the shader optimization

[Vadim Girlin]

On 03/02/2013 05:15 AM, Sebastien Caty wrote:
> On February 28, 2013 12:19:30 PM Vadim Girlin wrote:
>> Make sure that you have recent patches, some problems with R7xx chips
>> were fixed yesterday. Then please check if there are any regressions
>> with piglit tests (as compared to the piglit results with R600_SB=0). If
>> there are regressions, send me the shader dumps printed when you run the
>> regressed tests with "R600_SB_DUMP=3 R600_DUMP_SHADERS=2". If you could
>> also figure out the failing shader in each case (as described in [1]),
>> this will help to spot the problem. Also you might want to check if
>> there are any problems with some other more simple and/or open-source
>> applications, so that it will be easier for me to reproduce the issue
>> (if it's not r7xx-specific). One more way to help me with debugging your
>> issue with SS3 is to use apitrace to create the minimal trace that
>> reproduces it (again, if only it's not r7xx-specific, so that it may be
>> reproduced with my evergreen card, otherwise you could try to apply the
>> method [1] to locate the guilty shader and send me the shader dump).
>> Anyway, it's better to start with piglit - it's usually a lot easier to
>> debug any issues with a small and simple apps such as the piglit tests.
>>
>> Vadim
>
> Got piglit running after figuring out that piglit uses LLVM if it's available
> even if R600_LLVM is not set. I had a lot of GPU lockups and CS errors.
>

If you are building mesa with R600 LLVM backend enabled, then the driver 
uses LLVM backend by default, so you have to disable it explicitly with 
R600_LLVM=0 if you don't want to use it. LLVM backend has its own 
problems with piglit, so for now it's better to disable it when you are 
testing r600-sb to avoid mixing r600-sb's and LLVM's issues, probably 
it's simpler just to build mesa without LLVM backend for this testing.

Vadim

> I reduced piglit tests to the shaders set. Most of them passes correctly, 3
> are marked as fixed, 9 of them regressions, no chrases.
>
> Trying to dig more and found out which shader is causing trouble but I haven't
> found out how to run a specific test with piglit. Documentation isn't to
> friendly...Id appreciate some help with this.
>
> Test that failed :
>
> glx-visuals-stencil-pixmap
> glsl-const-builtin-notEqual-06
> glsl-fs-discard-02
> glsl-fs-fogcolor-statechange
> glsl-fs-loop-two-counter-02
> glsl-fs-loop-two-counter-04
> glsl-fs-vec4-indexing-5
> glsl-fs-vec4-indexing-6
> glsl-uniform-non-uniform-array-compare
>
>
>>
>> [1]: see section "Regression debugging" at
>>        http://people.freedesktop.org/~vadimg/r600-sb.html
>>
>>>> Vadim
>>>
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