1214152Sed/* ===-- ffsti2.c - Implement __ffsti2 -------------------------------------===
2214152Sed *
3214152Sed *                     The LLVM Compiler Infrastructure
4214152Sed *
5222656Sed * This file is dual licensed under the MIT and the University of Illinois Open
6222656Sed * Source Licenses. See LICENSE.TXT for details.
7214152Sed *
8214152Sed * ===----------------------------------------------------------------------===
9214152Sed *
10214152Sed * This file implements __ffsti2 for the compiler_rt library.
11214152Sed *
12214152Sed * ===----------------------------------------------------------------------===
13214152Sed */
14214152Sed
15214152Sed#include "int_lib.h"
16214152Sed
17214152Sed#ifdef CRT_HAS_128BIT
18214152Sed
19222656Sed/* Returns: the index of the least significant 1-bit in a, or
20222656Sed * the value zero if a is zero. The least significant bit is index one.
21239138Sandrew */
22222656Sed
23214152Sedsi_int
24214152Sed__ffsti2(ti_int a)
25214152Sed{
26214152Sed    twords x;
27214152Sed    x.all = a;
28214152Sed    if (x.s.low == 0)
29214152Sed    {
30214152Sed        if (x.s.high == 0)
31214152Sed            return 0;
32214152Sed        return __builtin_ctzll(x.s.high) + (1 + sizeof(di_int) * CHAR_BIT);
33214152Sed    }
34214152Sed    return __builtin_ctzll(x.s.low) + 1;
35214152Sed}
36214152Sed
37214152Sed#endif /* CRT_HAS_128BIT */
38214152Sed