1353358Sdim//===-- ctzti2.c - Implement __ctzti2 -------------------------------------===//
2353358Sdim//
3353358Sdim// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4353358Sdim// See https://llvm.org/LICENSE.txt for license information.
5353358Sdim// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6353358Sdim//
7353358Sdim//===----------------------------------------------------------------------===//
8353358Sdim//
9353358Sdim// This file implements __ctzti2 for the compiler_rt library.
10353358Sdim//
11353358Sdim//===----------------------------------------------------------------------===//
12276789Sdim
13276789Sdim#include "int_lib.h"
14276789Sdim
15276789Sdim#ifdef CRT_HAS_128BIT
16276789Sdim
17353358Sdim// Returns: the number of trailing 0-bits
18276789Sdim
19353358Sdim// Precondition: a != 0
20276789Sdim
21353358SdimCOMPILER_RT_ABI si_int __ctzti2(ti_int a) {
22353358Sdim  twords x;
23353358Sdim  x.all = a;
24353358Sdim  const di_int f = -(x.s.low == 0);
25353358Sdim  return __builtin_ctzll((x.s.high & f) | (x.s.low & ~f)) +
26353358Sdim         ((si_int)f & ((si_int)(sizeof(di_int) * CHAR_BIT)));
27276789Sdim}
28276789Sdim
29353358Sdim#endif // CRT_HAS_128BIT
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