[Bug 92923] SGPR spilling

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92923

            Bug ID: 92923
           Summary: SGPR spilling
           Product: Mesa
           Version: 11.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: freedesktop.org at psycho3d.de
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 119606
  --> https://bugs.freedesktop.org/attachment.cgi?id=119606&action=edit
stacktrace from game log file

"LLVM triggered Diagnostic Handler: Ran out of VGPRs for spilling SGPR"

The game Planet Explorers crashes after a few minutes, the log file is flooded
with this error message.

Additional error messages:
radeon_llvm_compile: Processing Diag Flag
LLVM failed to compile shader
EE si_state_shaders.c:647 si_shader_select - Failed to build shader variant
(type=1) 1

The problem may have started with mesa 11.0 but I'm not sure, I don't play it
very often. The game runs on unity 5.

Attaching backtrace and stacktrace from the log file. There is also a memory
map I could attach.

OpenGL info from the log file:
Version:  OpenGL 3.0 [3.0 Mesa 11.0.5]
Renderer: Gallium 0.4 on AMD PITCAIRN (DRM 2.43.0, LLVM 3.7.0)
Vendor:   X.Org
VRAM:     2048 MB

Hardware is a Radeon HD 7870

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