[PATCH] D123819: [InstCombine] Fold strlen and strnlen recursively.

[Dávid Bolvanský via Phabricator via llvm-commits]

xbolva00 added a comment.

Cases like  strlen (x ? s1 : s2) should be handled in more general fashion and rewrite fn (x ? s1 : s2)  as x ? fn(s1) : fn(s2)  if  fn(s1) and (or?) fn(s2)  can be optimized to just some (constant) value.

Same for more chains like fn (x == 3 ? s3 : x == 5 ? s5 : s7) to x == 3 ? fn(s3) : x == 5 ? fn(s2) : fn(s5).


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  https://reviews.llvm.org/D123819/new/

https://reviews.llvm.org/D123819