[llvm] [DirectX] Start the creation of a DXIL Instruction legalizer (PR #131221)

[Chris B via llvm-commits]

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@@ -0,0 +1,209 @@
+//===- DXILLegalizePass.cpp - Legalizes llvm IR for DXIL ------------------===//
+//
+// 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
+//
+//===---------------------------------------------------------------------===//
+//===---------------------------------------------------------------------===//
+///
+/// \file This file contains a pass to remove i8 truncations and i64 extract
+/// and insert elements.
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llvm-beanz wrote:

Is this the only set of legalizations you expect this pass to handle? If not, this will probably get out of date quickly.

https://github.com/llvm/llvm-project/pull/131221