text: /* ===-- ctzti2.c - Implement __ctzti2 -------------------------------------===
   *
   *                     The LLVM Compiler Infrastructure
   *
   * This file is dual licensed under the MIT and the University of Illinois Open
   * Source Licenses. See LICENSE.TXT for details.
   *
   * ===----------------------------------------------------------------------===
   *
   * This file implements __ctzti2 for the compiler_rt library.
   *
   * ===----------------------------------------------------------------------===
   */
  
  #include "int_lib.h"
  
  #if __x86_64
  
  /* Returns: the number of trailing 0-bits */
  
  /* Precondition: a != 0 */
  
  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
  