[llvm-dev] [llvm-reduce] Reduction to undef/poison/null?

Arthur Eubanks via llvm-dev
Mon, 30 Aug 2021 17:50:15 -0000

Currently in llvm-reduce when we try to remove instructions, we'll RAUW
them with undef. But it seems nicer to have the final IR use null values
(e.g. 0, zeroinitializer, etc) rather than undef. Should we attempt to use
null values? Or why undef over poison?
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