[llvm] [SLP][modularisation][NFC] Move pointer/stride helpers to SLPMemoryUtils (PR #221786)

[Madhur Amilkanthwar via llvm-commits]

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@@ -0,0 +1,56 @@
+//===- SLPMemoryUtils.h - SLP pointer/stride helpers -----------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Internal header used by SLPVectorizer.cpp. It declares free pointer and
+// stride helpers that do not depend on BoUpSLP or any other SLP-private type.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TRANSFORMS_VECTORIZE_SLPVECTORIZER_SLPMEMORYUTILS_H
+#define LLVM_LIB_TRANSFORMS_VECTORIZE_SLPVECTORIZER_SLPMEMORYUTILS_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/Support/Alignment.h"
+
+namespace llvm {
+class DataLayout;
+class SCEV;
+class ScalarEvolution;
+class TargetLibraryInfo;
+class Type;
+class Value;
+} // namespace llvm
+
+namespace llvm::slpvectorizer {
+
+/// \p MaxDepth is the recursion limit for getUnderlyingObject.
+bool arePointersCompatible(Value *Ptr1, Value *Ptr2,
+                           const TargetLibraryInfo &TLI, unsigned MaxDepth,
+                           bool CompareOpcodes = true);
+
+/// Calculates minimal alignment as a common alignment.
+template <typename T> Align computeCommonAlignment(ArrayRef<Value *> VL);
+
+/// Checks if the provided list of pointers \p Pointers represents the strided
+/// pointers for type ElemTy. If they are not, nullptr is returned.
+/// Otherwise, SCEV* of the stride value is returned.
+/// If `PointerOps` can be rearanged into the following sequence:
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madhur13490 wrote:

done.

https://github.com/llvm/llvm-project/pull/221786