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

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

[bugzilla-daemon]

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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@lists.freedesktop.org
          Reporter: arek.rusi@gmail.com
        QA Contact: dri-devel@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@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@amd.com>

:040000 040000 2c773601e2956578e8da4a6031cb02837255b953
7d5f7c3faebe4a11631e70bde258d78fa7357008 M      src

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

[bugzilla-daemon]

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

--- Comment #1 from Arek Ruśniak <arek.rusi@gmail.com> ---
Created attachment 128045
  --> https://bugs.freedesktop.org/attachment.cgi?id=128045&action=edit
ground looks good

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[Bug 98761] [regression][radeonsi][polaris]"radeonsi: set IF_THRESHOLD to 3" breaks Witcher2's ground

[bugzilla-daemon]

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

Nicolai Hähnle <nhaehnle@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[regression][radeonsi][pola |[regression][radeonsi][pola
                   |ris]"radeonsi: set          |ris]"radeonsi: set
                   |IF_THRESHOLD to 3" breaks   |IF_THRESHOLD to 3" breaks
                   |Wither2's ground            |Witcher2's ground

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[Bug 98761] [regression][radeonsi][polaris]"radeonsi: set IF_THRESHOLD to 3" breaks Witcher2's ground

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

--- Comment #2 from Nicolai Hähnle <nhaehnle@gmail.com> ---
The patch at https://patchwork.freedesktop.org/patch/122101/ fixes a known
regression from that commit -- does it help here?

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[Bug 98761] [regression][radeonsi][polaris]"radeonsi: set IF_THRESHOLD to 3" breaks Witcher2's ground

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

--- Comment #3 from Arek Ruśniak <arek.rusi@gmail.com> ---
Created attachment 128053
  --> https://bugs.freedesktop.org/attachment.cgi?id=128053&action=edit
problem in motion

unfortunately, doesn't help here. (mesa git-da2a511 + your patch/llvm 287325)
this is how looks like in game before and after.

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[Bug 98761] [regression][radeonsi][polaris]"radeonsi: set IF_THRESHOLD to 3" breaks Witcher2's ground

[bugzilla-daemon]

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

--- Comment #4 from Marek Olšák <maraeo@gmail.com> ---
I can reproduce it, but I don't yet know how to find the bad shader.

apitrace doesn't work with this game and shaders aren't always loaded in the
same order.

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[Bug 98761] [regression][radeonsi][polaris]"radeonsi: set IF_THRESHOLD to 3" breaks Witcher2's ground

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

--- Comment #5 from Marek Olšák <maraeo@gmail.com> ---
This is only reproducible on LLVM 4.0 trunk.

LLVM 3.9 renders doesn't have this issue.

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[Bug 98761] [regression][radeonsi][polaris]"radeonsi: set IF_THRESHOLD to 3" breaks Witcher2's ground

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

--- Comment #6 from Nicolai Hähnle <nhaehnle@gmail.com> ---
If Witcher 2 has scalar spills, I'd suggest trying LLVM trunk from before
r286766 (or perhaps with that commit reverted), as there's another known bug:
SGPR spills conflict with fragment shader input interpolation (because both use
M0), and it's possible that the Mesa commit simply exposed the issue.

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[Bug 98761] [regression][radeonsi][polaris]"radeonsi: set IF_THRESHOLD to 3" breaks Witcher2's ground

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

--- Comment #7 from Marek Olšák <maraeo@gmail.com> ---
Found the bad shader.

The good one has before v_interp:
s_mov_b32 m0, s11

The bad one has before v_interp:
s_mov_b32 m0, s19

I don't see any store instructions though.

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[Bug 98761] [regression][radeonsi][polaris]"radeonsi: set IF_THRESHOLD to 3" breaks Witcher2's ground

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

--- Comment #8 from Marek Olšák <maraeo@gmail.com> ---
Scratch that. The bad one has this:

s_mov_b32 s19, s11
s_mov_b32 m0, s19

It looks like it's not an m0 issue.

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[Bug 98761] [regression][radeonsi][polaris]"radeonsi: set IF_THRESHOLD to 3" breaks Witcher2's ground

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

Daniel Scharrer <daniel@constexpr.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |daniel@constexpr.org

--- Comment #9 from Daniel Scharrer <daniel@constexpr.org> ---
Found a possibly related bug in another game: #98776.

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

--- Comment #10 from Arek Ruśniak <arek.rusi@gmail.com> ---
Nicolai, I don't want to bisect llvm I really hate it but i've tried r286757 &
r286827 and problem is somewhere between. So you have right i believe. 

And still can't reproduce this on hd7770 (verde).

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

--- Comment #11 from Marek Olšák <maraeo@gmail.com> ---
First bad commit:

commit 4404d0d6e354e80dd7f8f0a0e12d8ad809cf007e
Author: Matt Arsenault <Matthew.Arsenault@amd.com>
Date:   Sun Nov 13 18:20:54 2016 +0000

    AMDGPU: Implement SGPR spilling with scalar stores

    nThis avoids the nasty problems caused by using
    memory instructions that read the exec mask while
    spilling / restoring registers used for control flow
    masking, but only for VI when these were added.

    This always uses the scalar stores when enabled currently,
    but it may be better to still try to spill to a VGPR
    and use this on the fallback memory path.

    The cache also needs to be flushed before wave termination
    if a scalar store is used.

    git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286766
91177308-0d34-0410-b5e6-96231b3b80d8

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[Bug 98761] [regression][radeonsi][polaris]"radeonsi: set IF_THRESHOLD to 3" breaks Witcher2's ground

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

--- Comment #12 from Marek Olšák <maraeo@gmail.com> ---
Created attachment 128128
  --> https://bugs.freedesktop.org/attachment.cgi?id=128128&action=edit
affected shader (good asm)

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[Bug 98761] [regression][radeonsi][polaris]"radeonsi: set IF_THRESHOLD to 3" breaks Witcher2's ground

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

--- Comment #13 from Marek Olšák <maraeo@gmail.com> ---
Created attachment 128129
  --> https://bugs.freedesktop.org/attachment.cgi?id=128129&action=edit
affected shader (good->bad diff)

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[-- Attachment #1.1: Type: text/plain, Size: 318 bytes --]

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

--- Comment #14 from Marek Olšák <maraeo@gmail.com> ---
Created attachment 128130
  --> https://bugs.freedesktop.org/attachment.cgi?id=128130&action=edit
affected shader (bad asm)

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

--- Comment #15 from Marek Olšák <maraeo@gmail.com> ---
It looks like m0 isn't restored for v_interp instructions.

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

--- Comment #16 from Grazvydas Ignotas <notasas@gmail.com> ---
Possible duplicates: bug 98776 bug 98783 bug 98785
llvm bug: https://llvm.org/bugs/show_bug.cgi?id=31019

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

--- Comment #17 from Arek Ruśniak <arek.rusi@gmail.com> ---
Marek, thanks for help with llvm. 
Grazvydas, with Talos I agree, even opengl is garbage now. Unigine-heaven has
similar problem since r286766 
Probably guilty is "AMDGPU: Implement SGPR spilling with scalar stores" for all
scenario but i never ever had any problem with Life is Strange (I've just
finished E01)

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--- Comment #18 from Matt Arsenault <arsenm2@gmail.com> ---
Try after llvm r287844

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

--- Comment #19 from Marek Olšák <maraeo@gmail.com> ---
Created attachment 128178
  --> https://bugs.freedesktop.org/attachment.cgi?id=128178&action=edit
still bad

(In reply to Matt Arsenault from comment #18)
> Try after llvm r287844

It's still pretty broken. See the attached asm. "s_mov vcc_hi, m0" looks
suspicious.

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

--- Comment #20 from Matt Arsenault <arsenm2@gmail.com> ---
(In reply to Marek Olšák from comment #19)
> Created attachment 128178 [details]
> still bad
> 
> (In reply to Matt Arsenault from comment #18)
> > Try after llvm r287844
> 
> It's still pretty broken. See the attached asm. "s_mov vcc_hi, m0" looks
> suspicious.

s_mov vcc_hi, m0 is fine and expected. TableGen happens to sort VCC to the
beginning of the SReg_64 register class list, so the scavenger tends to find
VCC first if its available

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[Bug 98761] [regression][radeonsi][polaris]"radeonsi: set IF_THRESHOLD to 3" breaks Witcher2's ground

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

--- Comment #21 from Matt Arsenault <arsenm2@gmail.com> ---
This is more concerning: s_buffer_store_dword exec_lo, s[84:87], m0

exec should never be spilled

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

--- Comment #22 from Arek Ruśniak <arek.rusi@gmail.com> ---
Created attachment 128180
  --> https://bugs.freedesktop.org/attachment.cgi?id=128180&action=edit
witcher2_r287854

so, it's resolved ground's problem for me, the movie is not looking perfect but
this is not problem of this bug report i think. 

Marek, Matt I don't know what do you talking about but maybe you are looking
for:
https://bugs.freedesktop.org/show_bug.cgi?id=98238 
there is big visual differences between mesa 12.0.4 vs 13.0 ...work in
progress:)

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[Bug 98761] [regression][radeonsi][polaris]"radeonsi: set IF_THRESHOLD to 3" breaks Witcher2's ground

[bugzilla-daemon]

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

Arek Ruśniak <arek.rusi@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #23 from Arek Ruśniak <arek.rusi@gmail.com> ---
Oops.. when Marek reverted "SGPR spilling..."-stuff, this one should be closed
aswell.

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