tree 9ab3819eca03d39c8a324d8ceed3dc174fcc237d
parent 6c4a5e9257bac022ffe60e466686ba7fc96ffd1a
author Craig Topper <craig.topper@intel.com> 1593898549 -0700
committer Craig Topper <craig.topper@intel.com> 1593898549 -0700

[DAGCombiner] visitSIGN_EXTEND_INREG should fold sext_vector_inreg(undef) to 0 not undef.

We need to ensure that the sign bits of the result all match
so we can't fold to undef.

Similar to PR46585.

Reviewed By: lebedev.ri

Differential Revision: https://reviews.llvm.org/D83163