[PATCH] D30311: [ValueTracking] Don't do an unchecked shift in ComputeNumSignBits

Eli Friedman via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Thu Feb 23 15:10:00 PST 2017


efriedma added a comment.

> why not be maximally aggressive?

This is not how undef works... unlike poison, you can't assert sign bits you don't actually have.


https://reviews.llvm.org/D30311





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