[PATCH] D70852: [InstCombine] Guard maxnum/minnum conversions with a TTI query

[Ulrich Weigand via Phabricator via llvm-commits]

uweigand added a comment.

In D70852#1763820 <https://reviews.llvm.org/D70852#1763820>, @lebedev.ri wrote:

> This seems like a lowering problem in SystemZ backend.


So is the backend supposed to lower minnum/maxnum always (to the obvious select sequence, I guess?), even if there's no instruction for it?   Why would that be the job of the backend?


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