[llvm] [DirectX] Flatten arrays (PR #114332)

[Justin Bogner via llvm-commits]

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@@ -0,0 +1,458 @@
+//===- DXILFlattenArrays.cpp - Flattens DXIL 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
+//
+//===---------------------------------------------------------------------===//
+
+///
+/// \file This file contains a pass to flatten arrays for the DirectX Backend.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DXILFlattenArrays.h"
+#include "DirectX.h"
+#include "llvm/ADT/PostOrderIterator.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/Analysis/DXILResource.h"
+#include "llvm/IR/BasicBlock.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/InstVisitor.h"
+#include "llvm/IR/ReplaceConstant.h"
+#include "llvm/Support/Casting.h"
+#include "llvm/Transforms/Utils/Local.h"
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+
+#define DEBUG_TYPE "dxil-flatten-arrays"
+
+using namespace llvm;
+
+class DXILFlattenArraysLegacy : public ModulePass {
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bogner wrote:

I was under the impression that these were usually called `XYZLegacyPass` (with the resulting oddity that `XYZLegacyPassPass` shows up in a few places), but looking around it looks like we're wildly inconsistent on which naming convention is used for legacy passes, so this is probably fine.

https://github.com/llvm/llvm-project/pull/114332