usr/src/lib/libc/quad/lshldi3.c

/*-
 * Copyright (c) 1992 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)lshldi3.c   5.1 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include "longlong.h"

long long
__lshldi3 (u, b1)
     long long u;
     long long b1;
{
  long_long w;
  unsigned long carries;
  int bm;
  long_long uu;
  int b = b1;

  if (b == 0)
    return u;

  uu.ll = u;

  bm = (sizeof (int) * BITS_PER_UNIT) - b;
  if (bm <= 0)
    {
      w.s.low = 0;
      w.s.high = (unsigned long)uu.s.low << -bm;
    }
  else
    {
      carries = (unsigned long)uu.s.low >> bm;
      w.s.low = (unsigned long)uu.s.low << b;
      w.s.high = ((unsigned long)uu.s.high << b) | carries;
    }

  return w.ll;
}