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/* ===-- ctzti2.c - Implement __ctzti2 -------------------------------------===
*
* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
* See https://llvm.org/LICENSE.txt for license information.
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
*
* ===----------------------------------------------------------------------===
*
* This file implements __ctzti2 for the compiler_rt library.
*
* ===----------------------------------------------------------------------===
*/
#include "int_lib.h"
#ifdef CRT_HAS_128BIT
/* Returns: the number of trailing 0-bits */
/* Precondition: a != 0 */
COMPILER_RT_ABI si_int __ctzti2(ti_int a) {
twords x;
x.all = a;
const di_int f = -(x.s.low == 0);
return __builtin_ctzll((x.s.high & f) | (x.s.low & ~f)) +
((si_int)f & ((si_int)(sizeof(di_int) * CHAR_BIT)));
}
#endif /* CRT_HAS_128BIT */
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