1 files changed, 21 insertions, 0 deletions
diff --git a/test/Misc/backend-optimization-failure.cpp b/test/Misc/backend-optimization-failure.cpp
new file mode 100644
index 000000000000..1b79fb31d1f9
--- /dev/null
+++ b/test/Misc/backend-optimization-failure.cpp
@@ -0,0 +1,21 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown %s -O3 -emit-llvm -gline-tables-only -S -verify -o /dev/null
+// REQUIRES: x86-registered-target
+
+// Test verifies optimization failures generated by the backend are handled
+// correctly by clang. LLVM tests verify all of the failure conditions.
+
+void test_switch(int *A, int *B, int Length) {
+#pragma clang loop vectorize(enable) unroll(disable)
+  for (int i = 0; i < Length; i++) {
+    /* expected-warning {{loop not vectorized: failed explicitly specified loop vectorization}} */ switch (A[i]) {
+    case 0:
+      B[i] = 1;
+      break;
+    case 1:
+      B[i] = 2;
+      break;
+    default:
+      B[i] = 3;
+    }
+  }
+}