[Mlir-commits] [mlir] [mlir][vector][nfc] Add tests + update docs for narrow-type emulation (PR #115460)

[Han-Chung Wang]

================
@@ -1,11 +1,19 @@
-//===- VectorEmulateNarrowType.cpp - Narrow type emulation ----*- C++
-//-*-===//
+//===- VectorEmulateNarrowType.cpp - Narrow type emulation ----------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
+//
+// This file implements target-independent rewrites and utilities to emulate
+// narrow types that are not supported by the target hardware, e.g. i4, using
+// wider types, e.g. i8.
+//
+/// Currently, only power-of-two integer types are supported. These are
----------------
hanhanW wrote:

+1, perhaps we can explicitly say that the non-power-of-two types are not implemented yet in the description. It looks more clear for newcomers for the narrow type emulations.

https://github.com/llvm/llvm-project/pull/115460