[all-commits] [llvm/llvm-project] 0c2f85: Workaround incorrect types when lowering fixed len...

[Bradley Smith via All-commits]

  Branch: refs/heads/release/13.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 0c2f8599a9cc42014b41aadf7c308b4889d2397f
      https://github.com/llvm/llvm-project/commit/0c2f8599a9cc42014b41aadf7c308b4889d2397f
  Author: Bradley Smith <bradley.smith at arm.com>
  Date:   2021-09-09 (Thu, 09 Sep 2021)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/test/CodeGen/AArch64/sve-fixed-length-masked-gather.ll
    M llvm/test/CodeGen/AArch64/sve-fixed-length-masked-scatter.ll

  Log Message:
  -----------
  Workaround incorrect types when lowering fixed length gather/scatter

When lowering a fixed length gather/scatter the index type is assumed to
be the same as the memory type, this is incorrect in cases where the
extension of the index has been folded into the addressing mode.

For now add a temporary workaround to fix the codegen faults caused by
this by preventing the removal of this extension. At a later date the
lowering for SVE gather/scatters will be redesigned to improve the way
addressing modes are handled.

As a short term side effect of this change, the addressing modes
generated for fixed length gather/scatters will not be optimal.

Differential Revision: https://reviews.llvm.org/D109145

(cherry picked from commit 14e1a4a6eef2fb95ec852c9ddfc597f80bba3226)