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/usr/include/osl/misc/slowBsf.h is in libosl-dev 0.6.0-3.1.

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/* slowBsf.h
 */
#ifndef OSL_SLOWBSF_H
#define OSL_SLOWBSF_H

namespace osl
{
  namespace misc
  {
  /**
   * non-0 の時に呼ぶべし.
   * やはりどう考えても遅い
   */
  inline int slowbsf(unsigned int mask){
    assert(mask);
    int mask0= (static_cast<int>(-(mask&0xffff)))>>31;
    mask&=(mask0^0xffff0000);
    int mask1= (static_cast<int>(-(mask&0xff00ff)))>>31;
    mask&=(mask1^0xff00ff00);
    int mask2= (static_cast<int>(-(mask&0xf0f0f0f)))>>31;
    mask&=(mask2^0xf0f0f0f0);
    int mask3= (static_cast<int>(-(mask&0x33333333)))>>31;
    mask&=(mask3^0xcccccccc);
    int mask4= (static_cast<int>(-(mask&0x55555555)))>>31;
    return 31+(mask0&0xfffffff0)+(mask1&0xfffffff8)+
      (mask2&0xfffffffc)+(mask3&0xfffffffe)+mask4;
  }
} // namespace misc
} // namespace osl

#endif /* OSL_SLOWBSF_H */
// ;;; Local Variables:
// ;;; mode:c++
// ;;; c-basic-offset:2
// ;;; End: