[llvm-bugs] [Bug 31722] New: [Regression 3.9.1] Wrong colors in icons when using radeonsi + LLVM 3.9.1

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31722

            Bug ID: 31722
           Summary: [Regression 3.9.1] Wrong colors in icons when using
                    radeonsi + LLVM 3.9.1
           Product: libraries
           Version: 3.9
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: AMDGPU
          Assignee: unassignedbugs at nondot.org
          Reporter: nhaehnle at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

See the reports at:

https://bugs.freedesktop.org/show_bug.cgi?id=99078
https://bugs.launchpad.net/ubuntu/+source/llvm-toolchain-3.9/+bug/1656620?comments=all

This has been tracked down to r288105, the backport of "AMDGPU: Fix an
interaction between WQM and polygon stippling".

Looking at shader dumps from the bug reports, there are shaders affected by the
bug that was fixed by "AMDGPU: Do not clobber SCC in SIWholeQuadMode" in trunk.

I think it's reasonably low-risk to back-port

AMDGPU: Reduce the duration of whole-quad-mode
AMDGPU: Do not clobber SCC in SIWholeQuadMode

since they've been in trunk and hence the Padoka PPA for Ubuntu for several
months and I'm not aware of any bugs reported since then. Alternatively, we
could revert

AMDGPU: Fix an interaction between WQM and polygon stippling

to go back to how things were in 3.9 -- this re-introduces a low-impact bug,
but would fix this high-impact bug.

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