[PATCH] D27333: DAG: Fold out out of bounds insert_vector_elt

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: efriedma, bogner.
arsenm added a subscriber: llvm-commits.
Herald added subscribers: wdng, nemanjai.

getNode already prevents formation of out of bounds constant
extract_vector_elts. Do the same for insert_vector_elt.

As came up in https://reviews.llvm.org/D26174


https://reviews.llvm.org/D27333

Files:
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  test/CodeGen/PowerPC/vec_add_sub_quadword.ll
  test/CodeGen/X86/avx512-insert-extract.ll

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