[all-commits] [llvm/llvm-project] 97a7a9: [CodeGen] Fix up warnings in visitEXTRACT_SUBVECTOR

[david-arm via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 97a7a9abb25d86fd831b403a1d13de6d62e7a8b5
      https://github.com/llvm/llvm-project/commit/97a7a9abb25d86fd831b403a1d13de6d62e7a8b5
  Author: David Sherwood <david.sherwood at arm.com>
  Date:   2020-07-01 (Wed, 01 Jul 2020)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

  Log Message:
  -----------
  [CodeGen] Fix up warnings in visitEXTRACT_SUBVECTOR

It's perfectly valid to do certain DAG combines where we extract
subvectors from a concat vector when we have scalable vector types.
However, we can do this in a way that avoids generating compiler
warnings by replacing calls to getVectorNumElements() with
getVectorMinNumElements(). Due to the way subvector extracts are
designed to work with scalable vector types this is ok.

This eliminates some warnings from existing tests in this file:

  llvm/test/CodeGen/AArch64/sve-intrinsics-loads.ll

Differential Revision: https://reviews.llvm.org/D82655