================
@@ -0,0 +1,244 @@
+//===- RemarkSummary.cpp 
--------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Specialized tool to summarize remarks
+//
+//===----------------------------------------------------------------------===//
+
+#include "RemarkUtilHelpers.h"
+#include "RemarkUtilRegistry.h"
+
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/Regex.h"
+#include "llvm/Support/WithColor.h"
+#include <memory>
+
+using namespace llvm;
+using namespace remarks;
+using namespace llvm::remarkutil;
+
+namespace summary {
+
+static cl::SubCommand
+    SummarySub("summary", "Summarize Remarks using different strategies.");
+
+INPUT_FORMAT_COMMAND_LINE_OPTIONS(SummarySub)
+OUTPUT_FORMAT_COMMAND_LINE_OPTIONS(SummarySub)
+INPUT_OUTPUT_COMMAND_LINE_OPTIONS(SummarySub)
+
+static cl::OptionCategory SummaryStrategyCat("Strategy options");
+
+enum class KeepMode { None, Used, All };
+
+static cl::opt<KeepMode> KeepInputOpt(
+    "keep", cl::desc("Keep input remarks in output"), cl::init(KeepMode::None),
+    cl::values(clEnumValN(KeepMode::None, "none",
+                          "Don't keep input remarks (default)"),
+               clEnumValN(KeepMode::Used, "used",
+                          "Keep only remarks used for summary"),
+               clEnumValN(KeepMode::All, "all", "Keep all input remarks")),
+    cl::sub(SummarySub));
+
+static cl::opt<bool>
+    IgnoreMalformedOpt("ignore-malformed",
+                       cl::desc("Ignore remarks that fail to process"),
+                       cl::init(false), cl::Hidden, cl::sub(SummarySub));
+
+// Use one cl::opt per Strategy, because future strategies might need to take
+// per-strategy parameters.
+static cl::opt<bool> EnableInlineSummaryOpt(
----------------
jroelofs wrote:

wdyt about making this a `cl::list<std::unique_ptr<SummaryStrategy>>`? I think 
that would nicely support repeated summaries, like an optimization pipeline of 
sorts.

https://github.com/llvm/llvm-project/pull/160549
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