1 //===-- ctzti2.c - Implement __ctzti2 -------------------------------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file implements __ctzti2 for the compiler_rt library.
11 //===----------------------------------------------------------------------===//
17 // Returns: the number of trailing 0-bits
19 // Precondition: a != 0
21 COMPILER_RT_ABI si_int __ctzti2(ti_int a) {
24 const di_int f = -(x.s.low == 0);
25 return __builtin_ctzll((x.s.high & f) | (x.s.low & ~f)) +
26 ((si_int)f & ((si_int)(sizeof(di_int) * CHAR_BIT)));
29 #endif // CRT_HAS_128BIT