[llvm] [NVPTX] Add NVPTXIncreaseAligmentPass to improve vectorization (PR #144958)

[Alex MacLean via llvm-commits]

================
@@ -0,0 +1,131 @@
+//===-- NVPTXIncreaseAlignment.cpp - Increase alignment for local arrays --===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// A simple pass that looks at local memory arrays that are statically
+// sized and sets an appropriate alignment for them. This enables vectorization
+// of loads/stores to these arrays if not explicitly specified by the client.
+//
+// TODO: Ideally we should do a bin-packing of local arrays to maximize
+// alignments while minimizing holes.
----------------
AlexMaclean wrote:

That's a good point. I agree it seems like improving most programs is more important then handling these edge cases as well as possible. Do you think I should change the default behavior of the pass to the more aggressive alignment improvement heuristic?

https://github.com/llvm/llvm-project/pull/144958