[llvm-dev] The select story

Juneyoung Lee via llvm-dev llvm-dev at lists.llvm.org
Mon Oct 4 06:19:20 PDT 2021

Hello all,

In early 2021, a transformation in InstCombine that folds 'select i1 %a, i1
%b, i1 false' to 'and i1 %a, %b' (and another one for the 'or' case as
well) was removed because the folding was incorrect.

To explain the background about this change and a series of patches that
were made, I wrote a blog post:

I appreciate many people who helped fix it! :)

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