1 files changed, 37 insertions, 0 deletions
diff --git a/contrib/compiler-rt/lib/ffsti2.c b/contrib/compiler-rt/lib/ffsti2.c
new file mode 100644
index 0000000..0139eb1
--- /dev/null
+++ b/contrib/compiler-rt/lib/ffsti2.c
@@ -0,0 +1,37 @@
+/* ===-- ffsti2.c - Implement __ffsti2 -------------------------------------===
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file is distributed under the University of Illinois Open Source
+ * License. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ *
+ * This file implements __ffsti2 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#if __x86_64
+
+#include "int_lib.h"
+
+/* Returns: the index of the least significant 1-bit in a, or
+ * the value zero if a is zero. The least significant bit is index one.
+ */
+
+si_int
+__ffsti2(ti_int a)
+{
+    twords x;
+    x.all = a;
+    if (x.s.low == 0)
+    {
+        if (x.s.high == 0)
+            return 0;
+        return __builtin_ctzll(x.s.high) + (1 + sizeof(di_int) * CHAR_BIT);
+    }
+    return __builtin_ctzll(x.s.low) + 1;
+}
+
+#endif /* __x86_64 */