[PATCH] D149956: [DAG] Calculate the number of sign bits for constant BUILD_VECTOR directly.

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon accepted this revision.
RKSimon added a comment.
This revision is now accepted and ready to land.

Makes sense - we could go further and use ComputeKnownBits on the element whenever there is implicit truncation and chose between it and the ComputeNumSignBits call - but this is probably good enough in most cases.


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https://reviews.llvm.org/D149956