Philip Reames 68a2e4d48b [SimplifyDemandedVec] Strengthen handling all undef lanes (particularly GEPs) ...

A change of two parts:
1) A generic enhancement for all callers of SDVE to exploit the fact that if all lanes are undef, the result is undef.
2) A GEP specific piece to strengthen/fix the vector index undef element handling, and call into the generic infrastructure when visiting the GEP.

The result is that we replace a vector gep with at least one undef in each lane with a undef.  We can also do the same for vector intrinsics.  Once the masked.load patch (D57372) has landed, I'll update to include call tests as well.

Differential Revision: https://reviews.llvm.org/D57468

llvm-svn: 356293

2019-03-15 19:54:06 +00:00

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