[PATCH] D88432: [InstCombine] Fix pr47668

[Juneyoung Lee via Phabricator via llvm-commits]

aqjune added a comment.

In D88432#2298717 <https://reviews.llvm.org/D88432#2298717>, @lebedev.ri wrote:

> - if the shift amount is a variable, check that it is not undef
> - if it is a constant, sanitize undef elts to 0

In the first case, the variable should be checked to be less than the bitwidth as well, which is slightly expensive so not contained in this patch.

The second case is what this change contains. Additionally, it had to check whether the value was less than the bitwidth, which made the code slightly longer.


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  https://reviews.llvm.org/D88432/new/

https://reviews.llvm.org/D88432