1 files changed, 37 insertions, 0 deletions
diff --git a/lib/subvsi3.c b/lib/subvsi3.c
new file mode 100644
index 0000000..ce39c81
--- /dev/null
+++ b/lib/subvsi3.c
@@ -0,0 +1,37 @@
+/* ===-- subvsi3.c - Implement __subvsi3 -----------------------------------===
+ *
+ *      	       The LLVM Compiler Infrastructure
+ *
+ * This file is distributed under the University of Illinois Open Source
+ * License. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ *
+ * This file implements __subvsi3 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#include "int_lib.h"
+#include <stdlib.h>
+
+/* Returns: a - b */
+
+/* Effects: aborts if a - b overflows */
+
+si_int
+__subvsi3(si_int a, si_int b)
+{
+    si_int s = a - b;
+    if (b >= 0)
+    {
+        if (s > a)
+            compilerrt_abort();
+    }
+    else
+    {
+        if (s <= a)
+            compilerrt_abort();
+    }
+    return s;
+}