[llvm-dev] The select story

[Juneyoung Lee via llvm-dev]

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:
https://aqjune.github.io/posts/2021-10-4.the-select-story.html

I appreciate many people who helped fix it! :)

Sincerely,
Juneyoung
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