[all-commits] [llvm/llvm-project] a40599: [SelectionDAG][VP] Fix MemSDNode::getBasePtr

[Fraser Cormack via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a40599c97bd31871526d2399e8d545daa89ef702
      https://github.com/llvm/llvm-project/commit/a40599c97bd31871526d2399e8d545daa89ef702
  Author: Fraser Cormack <fraser at codeplay.com>
  Date:   2021-09-07 (Tue, 07 Sep 2021)

  Changed paths:
    M llvm/include/llvm/CodeGen/SelectionDAGNodes.h

  Log Message:
  -----------
  [SelectionDAG][VP] Fix MemSDNode::getBasePtr

Found while working on D108987. When interpreting VP nodes as
`MemSDNode` nodes, this function would return the incorrect indices.
This was due to `VP_GATHER` and having no "passthru", and both
`VP_GATHER` and `VP_SCATTER` having their mask operands *after* the base
pointer, unlike `MGATHER` and `MSCATTER`.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D109308