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| author | Sanjay Patel <spatel@rotateright.com> | 2021-12-13 10:02:38 -0500 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2021-12-13 10:12:19 -0500 |
| commit | f46a9c8edd4421e875927d6808fea04090e28d37 (patch) | |
| tree | a3bd3220416a8e6c9e460364797906cd6429cd48 /lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp | |
| parent | 843534db3cc90d4cabaf67b225256ecd53aeb613 (diff) | |
[InstCombine] don't automatically drop poison-generating flags in SimplifyVectorDemandedElts
I noticed this while reviewing the test diffs in D115460
(and so the diffs in that patch will be reduced if this one is applied first).
This is effectively a revert of 3436dc29239d ( https://reviews.llvm.org/rG3436dc29239d ) -
since that commit, we've made several enhancements, so the reasoning there is no longer
valid. Specifically, we added a poison value to IR, and we clarified the behavior of
undef/poison elements in a shuffle mask:
https://llvm.org/docs/LangRef.html#shufflevector-instruction
Alive2 seems to agree that the propagation of flags in the test diffs shown here are valid:
https://alive2.llvm.org/ce/z/UuY-jr
https://alive2.llvm.org/ce/z/GXoMD9
https://alive2.llvm.org/ce/z/nVCyVH
Differential Revision: https://reviews.llvm.org/D115526
Diffstat (limited to 'lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp')
0 files changed, 0 insertions, 0 deletions