blob: b49f2c713534af42cafe569373ca683692e925dc [file] [log] [blame]
/* ===-- ctzdi2.c - Implement __ctzdi2 -------------------------------------===
*
* The LLVM Compiler Infrastructure
*
* This file is distributed under the University of Illinois Open Source
* License. See LICENSE.TXT for details.
*
* ===----------------------------------------------------------------------===
*
* This file implements __ctzdi2 for the compiler_rt library.
*
* ===----------------------------------------------------------------------===
*/
#include "int_lib.h"
/* Returns: the number of trailing 0-bits */
/* Precondition: a != 0 */
si_int
__ctzdi2(di_int a)
{
dwords x;
x.all = a;
const si_int f = -(x.s.low == 0);
return __builtin_ctz((x.s.high & f) | (x.s.low & ~f)) +
(f & ((si_int)(sizeof(si_int) * CHAR_BIT)));
}