[PATCH] D32706: [AArch64] Consider widening instructions in cast cost calculation

[Evandro Menezes via Phabricator via llvm-commits]

evandro added a comment.

It shouldn't be assumed that such widening instructions are always free.  Their latency may be longer than the equivalent instruction sequences.  Preferably, the cost of both choices should weighed after consulting the backend.


https://reviews.llvm.org/D32706