1 files changed, 28 insertions, 0 deletions
diff --git a/contrib/compiler-rt/lib/builtins/negvsi2.c b/contrib/compiler-rt/lib/builtins/negvsi2.c
new file mode 100644
index 000000000000..b9e93fef06c5
--- /dev/null
+++ b/contrib/compiler-rt/lib/builtins/negvsi2.c
@@ -0,0 +1,28 @@
+/* ===-- negvsi2.c - Implement __negvsi2 -----------------------------------===
+ *
+ *                     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 __negvsi2 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#include "int_lib.h"
+
+/* Returns: -a */
+
+/* Effects: aborts if -a overflows */
+
+COMPILER_RT_ABI si_int
+__negvsi2(si_int a)
+{
+    const si_int MIN = (si_int)1 << ((int)(sizeof(si_int) * CHAR_BIT)-1);
+    if (a == MIN)
+        compilerrt_abort();
+    return -a;
+}