1 files changed, 33 insertions, 0 deletions
diff --git a/compiler-rt/lib/builtins/addvti3.c b/compiler-rt/lib/builtins/addvti3.c
new file mode 100644
index 000000000000..aa709875d243
--- /dev/null
+++ b/compiler-rt/lib/builtins/addvti3.c
@@ -0,0 +1,33 @@
+//===-- addvti3.c - Implement __addvti3 -----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// 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