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@lists.freedesktop.org
Reporter: tom.hudson....@gmail.com
QA Contact: mesa-dev@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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