[Mesa-dev] [Bug 106231] llvmpipe blends produce bad code after llvm patch https://reviews.llvm.org/D44785

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106231

            Bug ID: 106231
           Summary: llvmpipe blends produce bad code after llvm patch
                    https://reviews.llvm.org/D44785
           Product: Mesa
           Version: 18.0
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/llvmpipe
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: tom.hudson.phd at gmail.com
        QA Contact: mesa-dev at lists.freedesktop.org

https://reviews.llvm.org/D44785 changed the way adds, addus, subs, subus are
handled.

llvmpipe issues llvm.x86.sse2.padds and llvm.x86.sse2.psubs in
src/gallium/auxiliary/gallivm/lp_bld_arit.c:lp_build_add() and lp_build_sub().

After D44785 landed, lp_test_blend.c started crash every time it entered
LLVM-compiled code for type=u8nx16.

Commenting out the issues of padds/psubs avoids this crash. The LLVM project,
in discussing the bug at https://reviews.llvm.org/D44785, suspects that the
cause may be because llvmpipe is "missing the autoupgrade stage"?

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