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diff --git a/lib/Target/WebAssembly/WebAssemblyInstrAtomics.td b/lib/Target/WebAssembly/WebAssemblyInstrAtomics.td
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+// WebAssemblyInstrAtomics.td-WebAssembly Atomic codegen support-*- tablegen -*-
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// WebAssembly Atomic operand code-gen constructs.
+//
+//===----------------------------------------------------------------------===//
+
+// TODO: Implement atomic instructions.
+
+//===----------------------------------------------------------------------===//
+// Atomic fences
+//===----------------------------------------------------------------------===//
+
+// TODO: add atomic fences here...
+
+//===----------------------------------------------------------------------===//
+// Atomic loads
+//===----------------------------------------------------------------------===//
+
+// TODO: add atomic loads here...
+
+//===----------------------------------------------------------------------===//
+// Atomic stores
+//===----------------------------------------------------------------------===//
+
+// TODO: add atomic stores here...
+
+//===----------------------------------------------------------------------===//
+// Low-level exclusive operations
+//===----------------------------------------------------------------------===//
+
+// TODO: add exclusive operations here...
+
+// Load-exclusives.
+
+// Store-exclusives.
+
+// Store-release-exclusives.
+
+// And clear exclusive.