[Mlir-commits] [mlir] [mlir][LLVMIR] Add folder pass for `llvm.inttoptr` and `llvm.ptrtoint` (PR #143066)

[Christian Ulmann]

================
@@ -0,0 +1,43 @@
+//===- IntToPtrPtrToIntFolding.h - IntToPtr/PtrToInt folding ----*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares a pass that folds inttoptr/ptrtoint operation sequences.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef MLIR_DIALECT_LLVMIR_TRANSFORMS_INTTOPTRPTRTOINTFOLDING_H
+#define MLIR_DIALECT_LLVMIR_TRANSFORMS_INTTOPTRPTRTOINTFOLDING_H
+
+#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
+#include "mlir/Pass/Pass.h"
+
+namespace mlir {
+class RewritePatternSet;
+
+namespace LLVM {
+
+#define GEN_PASS_DECL_FOLDINTTOPTRPTRTOINTPASS
+#include "mlir/Dialect/LLVMIR/Transforms/Passes.h.inc"
+
+/// Populate patterns that fold inttoptr/ptrtoint op sequences such as:
+///
+///   * `inttoptr(ptrtoint(x))` -> `x`
+///   * `ptrtoint(inttoptr(x))` -> `x`
+///
+/// `addressSpaceBWs` contains the pointer bitwidth for each address space. If
+/// the pointer bitwidth information is not available for a specific address
+/// space, the folding for that address space is not performed.
+///
+/// TODO: Support DLTI.
+void populateIntToPtrPtrToIntFoldingPatterns(
+    RewritePatternSet &patterns, ArrayRef<unsigned> addressSpaceBWs);
+
+} // namespace LLVM
+} // namespace mlir
+
+#endif // MLIR_DIALECT_LLVMIR_TRANSFORMS_INTTOPTRPTRTOINTFOLDING_H
----------------
Dinistro wrote:

Nit: Missing newline 

https://github.com/llvm/llvm-project/pull/143066