1 files changed, 40 insertions, 0 deletions
diff --git a/lib/builtins/addvti3.c b/lib/builtins/addvti3.c
new file mode 100644
index 000000000000..c224de60aab0
--- /dev/null
+++ b/lib/builtins/addvti3.c
@@ -0,0 +1,40 @@
+/* ===-- addvti3.c - Implement __addvti3 -----------------------------------===
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file is dual licensed under the MIT and the University of Illinois Open
+ * Source Licenses. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ *
+ * This file implements __addvti3 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#include "int_lib.h"
+
+#ifdef CRT_HAS_128BIT
+
+/* Returns: a + b */
+
+/* Effects: aborts if a + b overflows */
+
+COMPILER_RT_ABI ti_int
+__addvti3(ti_int a, ti_int b)
+{
+    ti_int s = (tu_int) a + (tu_int) b;
+    if (b >= 0)
+    {
+        if (s < a)
+            compilerrt_abort();
+    }
+    else
+    {
+        if (s >= a)
+            compilerrt_abort();
+    }
+    return s;
+}
+
+#endif /* CRT_HAS_128BIT */