1 files changed, 32 insertions, 0 deletions
diff --git a/test/CodeGen/x86-builtins-vector-width.c b/test/CodeGen/x86-builtins-vector-width.c
new file mode 100644
index 0000000000000..62f5929e4fda9
--- /dev/null
+++ b/test/CodeGen/x86-builtins-vector-width.c
@@ -0,0 +1,32 @@
+// RUN: %clang_cc1 -triple i686-linux-gnu -target-cpu i686 -emit-llvm %s -o - | FileCheck %s
+
+typedef signed long long V2LLi __attribute__((vector_size(16)));
+typedef signed long long V4LLi __attribute__((vector_size(32)));
+
+// Make sure builtin forces a min-legal-width attribute
+void foo(void) {
+  V2LLi  tmp_V2LLi;
+
+  tmp_V2LLi = __builtin_ia32_undef128();
+}
+
+// Make sure explicit attribute larger than builtin wins.
+void goo(void) __attribute__((__min_vector_width__(256))) {
+  V2LLi  tmp_V2LLi;
+
+  tmp_V2LLi = __builtin_ia32_undef128();
+}
+
+// Make sure builtin larger than explicit attribute wins.
+void hoo(void) __attribute__((__min_vector_width__(128))) {
+  V4LLi  tmp_V4LLi;
+
+  tmp_V4LLi = __builtin_ia32_undef256();
+}
+
+// CHECK: foo{{.*}} #0
+// CHECK: goo{{.*}} #1
+// CHECK: hoo{{.*}} #1
+
+// CHECK: #0 = {{.*}}"min-legal-vector-width"="128"
+// CHECK: #1 = {{.*}}"min-legal-vector-width"="256"