1 files changed, 36 insertions, 0 deletions
diff --git a/lib/addvsi3.c b/lib/addvsi3.c
new file mode 100644
index 00000000..0eb10c24
--- /dev/null
+++ b/lib/addvsi3.c
@@ -0,0 +1,36 @@
+//===-- addvsi3.c - Implement __addvsi3 -----------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __addvsi3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+#include <stdlib.h>
+
+// Returns: a + b
+
+// Effects: aborts if a + b overflows
+
+si_int
+__addvsi3(si_int a, si_int b)
+{
+    si_int s = a + b;
+    if (b >= 0)
+    {
+        if (s < a)
+            abort();
+    }
+    else
+    {
+        if (s >= a)
+            abort();
+    }
+    return s;
+}