[Bug 50999] New: [r300g, bisected] piglit glsl-fs-discard-04 fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=50999

             Bug #: 50999
           Summary: [r300g, bisected] piglit glsl-fs-discard-04 fails
    Classification: Unclassified
           Product: Mesa
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r300
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: pavel.ondracka at email.cz
                CC: eric at anholt.net, tstellar at gmail.com


Created attachment 62924
  --> https://bugs.freedesktop.org/attachment.cgi?id=62924
RADEON_DEBUG=fp log

./bin/shader_runner tests/shaders/glsl-fs-discard-04.shader_test -auto -fbo
Probe at (0,0)
  Expected: 0.000000 1.000000 0.000000 0.000000
  Observed: 1.000000 0.000000 0.000000 0.000000
PIGLIT: {'result': 'fail' }

Regression test shows:
e21b9f1f19d2345026a7fbe095a776d0b64557ec is the first bad commit
commit e21b9f1f19d2345026a7fbe095a776d0b64557ec
Author: Eric Anholt <eric at anholt.net>
Date:   Fri May 4 13:37:08 2012 -0700

    glsl: Remove the opt_discard_simplification pass.

    This conflicts with the GLSL 1.30+ rules for derivatives after a
    discard has occurred.

    Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

llvmpipe works fine, so this may be another uncovered r300 compiler issue.

GPU:RV530
Kernel: 3.4.0-1.fc17.i686

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