[PATCH] D63060: [InstCombine] usub.sat(a, b) + b => umax(a, b) (PR42178)

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

In D63060#1535589 <https://reviews.llvm.org/D63060#1535589>, @nikic wrote:

> @lebedev.ri That looks like a bug in alive, `usub_sat i8 undef, 0x10` is not undef (we fold to zero).


Humm, that could explain part of the issue, but is that somewhere in langref?


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  rL LLVM

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