[all-commits] [llvm/llvm-project] a21bff: [CodeGen] Add support for widening the result of E...

[david-arm via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a21bff0673a1d593588c69e2ed2f557af40faa2d
      https://github.com/llvm/llvm-project/commit/a21bff0673a1d593588c69e2ed2f557af40faa2d
  Author: David Sherwood <david.sherwood at arm.com>
  Date:   2021-05-20 (Thu, 20 May 2021)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
    M llvm/test/CodeGen/AArch64/sve-extract-vector.ll
    M llvm/test/CodeGen/AArch64/sve-int-arith.ll

  Log Message:
  -----------
  [CodeGen] Add support for widening the result of EXTRACT_SUBVECTOR

When trying to return a type such as <vscale x 1 x i32> from a
function we crash in DAGTypeLegalizer::WidenVecRes_EXTRACT_SUBVECTOR
when attempting to get the fixed number of elements in the vector.

For the simple case we are dealing with, i.e. extracting
<vscale x 1 x i32> from index 0 of input vector <vscale x 4 x i32>
we can simply rely upon existing code that just returns the input.

Differential Revision: https://reviews.llvm.org/D102605