[Bug 98761] [regression][radeonsi][polaris]"radeonsi: set IF_THRESHOLD to 3" breaks Wither2's ground

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98761

            Bug ID: 98761
           Summary: [regression][radeonsi][polaris]"radeonsi: set
                    IF_THRESHOLD to 3" breaks Wither2's ground
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: arek.rusi at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 128044
  --> https://bugs.freedesktop.org/attachment.cgi?id=128044&action=edit
ground looks weird

mesa/llvm git/trunk
kernel 4.8.x & drm-next-4.10-wip

this is happend on polaris(rx470)
verde works corectly (for radeon drv, amdgpu not tested yet)


bisected:
74e39de9324d2d2333cda6adca50ae2a3fc36de2 is the first bad commit
commit 74e39de9324d2d2333cda6adca50ae2a3fc36de2
Author: Marek Olšák <marek.olsak at amd.com>
Date:   Fri Oct 28 23:08:50 2016 +0200

    radeonsi: set IF_THRESHOLD to 3

    Piglit regressions (radeonsi or LLVM bugs, they pass on softpipe):
    - glsl-1.10/execution/variable-indexing/vs-output-array-vec3-index-wr
    - glsl-1.10/execution/variable-indexing/vs-output-array-vec4-index-wr
    - glsl-110/execution/variable-indexing/vs-temp-array-mat2-index-col-row-wr
    - glsl-110/execution/variable-indexing/vs-temp-array-mat2-index-row-wr

    Totals:
    SGPRS: 1132185 -> 1168801 (3.23 %)
    VGPRS: 907856 -> 906204 (-0.18 %)
    Spilled SGPRs: 2011 -> 2425 (20.59 %)
    Spilled VGPRs: 368 -> 96 (-73.91 %)
    Scratch VGPRs: 1344 -> 1060 (-21.13 %) dwords per thread
    Code Size: 35916164 -> 35705372 (-0.59 %) bytes
    LDS: 767 -> 767 (0.00 %) blocks
    Max Waves: 194010 -> 194921 (0.47 %)
    Wait states: 0 -> 0 (0.00 %)

    Before:
     VGPR SPILLING APPS   Shaders SpillVGPR ScratchVGPR
     alien_isolation         2938        38        40
     bioshock-infinite       1769       245       732
     dirt-showdown            548        85        72
     f1-2015                  776         0       320
     ue4_lightroom_inter..     74         0       180

    After:
     VGPR SPILLING APPS   Shaders SpillVGPR ScratchVGPR
     alien_isolation         2938        38        40
     bioshock-infinite       1769         0       480
     dirt-showdown            548        58        40
     f1-2015                  776         0       320
     ue4_lightroom_inter..     74         0       180

    Bioshock and DiRT benefit.

    If I set IF_THRESHOLD=4, tesseract starts spilling VGPRs

    Reviewed-by: Nicolai Hähnle <nicolai.haehnle at amd.com>

:040000 040000 2c773601e2956578e8da4a6031cb02837255b953
7d5f7c3faebe4a11631e70bde258d78fa7357008 M      src

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