[PATCH] D72396: [InstCombine] fold zext of masked bit set/clear

[Krasimir Georgiev via Phabricator via llvm-commits]

krasimir added a comment.

Internally, I can see that either (1) this causes the following code to miscompile, or (2) the code is UB:
https://github.com/grpc/grpc/blob/master/src/core/ext/transport/chttp2/transport/frame_settings.cc#L48
Note that in that code the two checks on lines 57 and 64 are related if that helps.

Working on providing a small reproducible test case.


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