Initial import of compiler-rt.
-
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@74292 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/subvti3.c b/lib/subvti3.c
new file mode 100644
index 0000000..b130c8c
--- /dev/null
+++ b/lib/subvti3.c
@@ -0,0 +1,40 @@
+//===-- subvti3.c - Implement __subvti3 -----------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __subvti3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#if __x86_64
+
+#include "int_lib.h"
+#include <stdlib.h>
+
+// Returns: a - b
+
+// Effects: aborts if a - b overflows
+
+ti_int
+__subvti3(ti_int a, ti_int b)
+{
+ ti_int s = a - b;
+ if (b >= 0)
+ {
+ if (s > a)
+ abort();
+ }
+ else
+ {
+ if (s <= a)
+ abort();
+ }
+ return s;
+}
+
+#endif