[Bug 100936] Radeonsi rendering corruption in unigine heaven (regression bissected)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100936

            Bug ID: 100936
           Summary: Radeonsi rendering corruption in unigine heaven
                    (regression bissected)
           Product: Mesa
           Version: git
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: maxijac at free.fr
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 131216
  --> https://bugs.freedesktop.org/attachment.cgi?id=131216&action=edit
Heaven regression

Hello,

Current git has a regression in rendering of Heaven. (See screenshot)
This is visible on a RX 480 (POLARIS10).
I bissected the issue and the first bad commit is :

0bceefc29591d64d5d529a726e68b837f1f504b2 is the first bad commit
commit 0bceefc29591d64d5d529a726e68b837f1f504b2
Author: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Date:   Tue Apr 25 00:31:48 2017 +0200

    radeonsi: disable the TGSI merge registers pass

    47109 shaders in 29632 tests
    Totals:
    SGPRS: 1917364 -> 1916620 (-0.04 %)
    VGPRS: 1165802 -> 1165202 (-0.05 %)
    Spilled SGPRs: 1880 -> 1843 (-1.97 %)
    Spilled VGPRs: 70 -> 65 (-7.14 %)
    Private memory VGPRs: 1184 -> 1184 (0.00 %)
    Scratch size: 1312 -> 1308 (-0.30 %) dwords per thread
    Code Size: 60211356 -> 60192268 (-0.03 %) bytes
    LDS: 1077 -> 1077 (0.00 %) blocks
    Max Waves: 428597 -> 428674 (0.02 %)
    Wait states: 0 -> 0 (0.00 %)

    Totals from affected shaders:
    SGPRS: 238173 -> 237429 (-0.31 %)
    VGPRS: 149556 -> 148956 (-0.40 %)
    Spilled SGPRs: 1263 -> 1226 (-2.93 %)
    Spilled VGPRs: 25 -> 20 (-20.00 %)
    Private memory VGPRs: 0 -> 0 (0.00 %)
    Scratch size: 20 -> 16 (-20.00 %) dwords per thread
    Code Size: 10457904 -> 10438816 (-0.18 %) bytes
    LDS: 50 -> 50 (0.00 %) blocks
    Max Waves: 41283 -> 41360 (0.19 %)
    Wait states: 0 -> 0 (0.00 %)

    Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
    Reviewed-by: Nicolai Hähnle <nicolai.haehnle at amd.com>
    Reviewed-by: Marek Olšák <marek.olsak at amd.com>

Reverting this small commit on top of master fixes the regression.

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