1 files changed, 28 insertions, 0 deletions
diff --git a/llvm/lib/Fuzzer/test/ShrinkControlFlowTest.cpp b/llvm/lib/Fuzzer/test/ShrinkControlFlowTest.cpp
new file mode 100644
index 00000000000..2fa17f156e2
--- /dev/null
+++ b/llvm/lib/Fuzzer/test/ShrinkControlFlowTest.cpp
@@ -0,0 +1,28 @@
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+
+// Test that we can find the minimal item in the corpus (3 bytes: "FUZ").
+#include <cstdint>
+#include <cstdlib>
+#include <cstddef>
+#include <cstring>
+#include <cstdio>
+
+static volatile int Sink;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+  int8_t Ids[256];
+  memset(Ids, -1, sizeof(Ids));
+  for (size_t i = 0; i < Size; i++)
+    if (Ids[Data[i]] == -1)
+      Ids[Data[i]] = i;
+  int F = Ids[(unsigned char)'F'];
+  int U = Ids[(unsigned char)'U'];
+  int Z = Ids[(unsigned char)'Z'];
+  if (F >= 0 && U > F && Z > U) {
+    Sink++;
+    // fprintf(stderr, "IDS: %d %d %d\n", F, U, Z);
+  }
+  return 0;
+}
+