[clang] [llvm] [IR] Add getelementptr nusw and nuw flags (PR #90824)

[Arthur Eubanks via llvm-commits]

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@@ -0,0 +1,86 @@
+//===-- llvm/GEPNoWrapFlags.h - NoWrap flags for GEPs -----------*- 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 defines the nowrap flags for getelementptr operators.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_GEPNOWRAPFLAGS_H
+#define LLVM_IR_GEPNOWRAPFLAGS_H
+
+namespace llvm {
+
+class GEPNoWrapFlags {
+  enum : unsigned{
+    InBoundsFlag = (1 << 0),
+    NUSWFlag = (1 << 1),
+    NUWFlag = (1 << 2),
+  };
+
+  unsigned Flags;
+  GEPNoWrapFlags(unsigned Flags) : Flags(Flags) {
+    assert((!isInBounds() || hasNoUnsignedSignedWrap()) &&
+           "inbounds implies nusw");
+  }
+
+public:
+  GEPNoWrapFlags() : Flags(0) {}
+  // For historical reasons, interpret plain boolean as InBounds.
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aeubanks wrote:

TODO: remove?

https://github.com/llvm/llvm-project/pull/90824