1214152Sed/* ===-- ctzti2.c - Implement __ctzti2 -------------------------------------=== 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 __ctzti2 for the compiler_rt library. 11214152Sed * 12214152Sed * ===----------------------------------------------------------------------=== 13214152Sed */ 14214152Sed 15263560Sdim#include "int_lib.h" 16263560Sdim 17263764Sdim#ifdef CRT_HAS_128BIT 18214152Sed 19214152Sed/* Returns: the number of trailing 0-bits */ 20214152Sed 21214152Sed/* Precondition: a != 0 */ 22214152Sed 23214152Sedsi_int 24214152Sed__ctzti2(ti_int a) 25214152Sed{ 26214152Sed twords x; 27214152Sed x.all = a; 28214152Sed const di_int f = -(x.s.low == 0); 29214152Sed return __builtin_ctzll((x.s.high & f) | (x.s.low & ~f)) + 30214152Sed ((si_int)f & ((si_int)(sizeof(di_int) * CHAR_BIT))); 31214152Sed} 32214152Sed 33263764Sdim#endif /* CRT_HAS_128BIT */ 34