1 files changed, 29 insertions, 0 deletions
diff --git a/compiler-rt/lib/builtins/absvsi2.c b/compiler-rt/lib/builtins/absvsi2.c
new file mode 100644
index 00000000000..4812af81598
--- /dev/null
+++ b/compiler-rt/lib/builtins/absvsi2.c
@@ -0,0 +1,29 @@
+/* ===-- absvsi2.c - Implement __absvsi2 -----------------------------------===
+ *
+ *                     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 __absvsi2 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#include "int_lib.h"
+
+/* Returns: absolute value */
+
+/* Effects: aborts if abs(x) < 0 */
+
+COMPILER_RT_ABI si_int
+__absvsi2(si_int a)
+{
+    const int N = (int)(sizeof(si_int) * CHAR_BIT);
+    if (a == (1 << (N-1)))
+        compilerrt_abort();
+    const si_int t = a >> (N - 1);
+    return (a ^ t) - t;
+}