[PATCH] D25847: [ValueTracking] Don't assume we can speculate shifts

Davide Italiano via llvm-commits llvm-commits at lists.llvm.org
Thu Oct 20 16:09:45 PDT 2016

davide added a comment.

In https://reviews.llvm.org/D25847#575957, @efriedma wrote:

> "A shift is undefined if the second operand is equal or larger than the number of bits in the first operand."
> Yes... but that's not undefined behavior.  LangRef just says "the result is undefined".

hmm, does this change the fact that we don't want to speculate in this case or you're commenting on the wording?


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