10b57cec5SDimitry Andric //===-- ctzti2.c - Implement __ctzti2 -------------------------------------===// 20b57cec5SDimitry Andric // 30b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 40b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 50b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 60b57cec5SDimitry Andric // 70b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 80b57cec5SDimitry Andric // 90b57cec5SDimitry Andric // This file implements __ctzti2 for the compiler_rt library. 100b57cec5SDimitry Andric // 110b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 120b57cec5SDimitry Andric 130b57cec5SDimitry Andric #include "int_lib.h" 140b57cec5SDimitry Andric 150b57cec5SDimitry Andric #ifdef CRT_HAS_128BIT 160b57cec5SDimitry Andric 170b57cec5SDimitry Andric // Returns: the number of trailing 0-bits 180b57cec5SDimitry Andric 190b57cec5SDimitry Andric // Precondition: a != 0 200b57cec5SDimitry Andric __ctzti2(ti_int a)21*5ffd83dbSDimitry AndricCOMPILER_RT_ABI int __ctzti2(ti_int a) { 220b57cec5SDimitry Andric twords x; 230b57cec5SDimitry Andric x.all = a; 240b57cec5SDimitry Andric const di_int f = -(x.s.low == 0); 250b57cec5SDimitry Andric return __builtin_ctzll((x.s.high & f) | (x.s.low & ~f)) + 260b57cec5SDimitry Andric ((si_int)f & ((si_int)(sizeof(di_int) * CHAR_BIT))); 270b57cec5SDimitry Andric } 280b57cec5SDimitry Andric 290b57cec5SDimitry Andric #endif // CRT_HAS_128BIT 30