1 files changed, 13 insertions, 0 deletions
diff --git a/test/CodeGen/pr3997.c b/test/CodeGen/pr3997.c
new file mode 100644
index 000000000000..814144cd14d1
--- /dev/null
+++ b/test/CodeGen/pr3997.c
@@ -0,0 +1,13 @@
+// RUN: %clang_cc1 %s -triple i386-unknown-linux-gnu -mregparm 3 -emit-llvm -o - | FileCheck %s
+
+void *memcpy(void *dest, const void *src, unsigned int n);
+
+void use_builtin_memcpy(void *dest, const void *src, unsigned int n) {
+  __builtin_memcpy(dest, src, n);
+}
+
+void use_memcpy(void *dest, const void *src, unsigned int n) {
+  memcpy(dest, src, n);
+}
+
+//CHECK: !{i32 1, !"NumRegisterParameters", i32 3}