1 files changed, 9 insertions, 0 deletions
diff --git a/test/CodeGen/nobuiltin.c b/test/CodeGen/nobuiltin.c
index 0a8e8bb..7cc8164 100644
--- a/test/CodeGen/nobuiltin.c
+++ b/test/CodeGen/nobuiltin.c
@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 -fno-builtin -O1 -S -o - %s | FileCheck %s
+// RUN: %clang_cc1 -fno-builtin-memset -O1 -S -o - %s | FileCheck -check-prefix=MEMSET %s
 
 void PR13497() {
   char content[2];
@@ -6,3 +7,11 @@ void PR13497() {
   // CHECK: __strcpy_chk
   __builtin___strcpy_chk(content, "", 1);
 }
+
+void PR4941(char *s) {
+  // Make sure we don't optimize this loop to a memset().
+  // MEMSET-LABEL: PR4941:
+  // MEMSET-NOT: memset
+  for (unsigned i = 0; i < 8192; ++i)
+    s[i] = 0;
+}