From ca9211ecdede9bdedb812b2243a4abdb8dacd1b9 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Wed, 7 Jan 2015 19:55:37 +0000
Subject: Import compiler-rt trunk r224034.

https://llvm.org/svn/llvm-project/compiler-rt/trunk@224034
---
 lib/builtins/ffsdi2.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 lib/builtins/ffsdi2.c

(limited to 'lib/builtins/ffsdi2.c')

diff --git a/lib/builtins/ffsdi2.c b/lib/builtins/ffsdi2.c
new file mode 100644
index 0000000000000..a5ac9900ff10b
--- /dev/null
+++ b/lib/builtins/ffsdi2.c
@@ -0,0 +1,33 @@
+/* ===-- ffsdi2.c - Implement __ffsdi2 -------------------------------------===
+ *
+ *                     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 __ffsdi2 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#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.
+ */
+
+COMPILER_RT_ABI si_int
+__ffsdi2(di_int a)
+{
+    dwords x;
+    x.all = a;
+    if (x.s.low == 0)
+    {
+        if (x.s.high == 0)
+            return 0;
+        return __builtin_ctz(x.s.high) + (1 + sizeof(si_int) * CHAR_BIT);
+    }
+    return __builtin_ctz(x.s.low) + 1;
+}
-- 
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