[Bug fortran/35759] WHERE with overlap with ELSEWHERE error

[burnus at gcc dot gnu dot org]

------- Comment #1 from burnus at gcc dot gnu dot org  2008-03-29 23:23 -------
Confirm.

The algorithm below does essentially:

while (1,0,1,0,1)
  uda1l( 1 _ 3 _ 5) = 2 3 4 5 6
else
  udal1 ( _ 3 _ 5 _) = 6 5 4 3 2
done

That is
1. uda1l(1) = 2
2. uda1l(3) = 5 <---\__
3. uda1l(3) = 4 <---/
4. uda1l(5) = 3 <---\__
5. uda1l(6) = 4 <---/

The order is wrong. The procedure has to be:

1. Establish control mask (i.e. 1,0,1,0,1) and run WHERE
  while (1,0,1,0,1)
    uda1l( 1 _ 3 _ 5) = 2 3 4 5 6
  end

2. Establish pending controlmask for ELSEWHERE (i.e. 0,1,0,1,0)
  elsewhile (0,1,0,1)
    uda1l( 1 _ 3 _ 5) = 2 3 4 5 6
  end


  {
    static logical(kind=4) A.2[5] = {1, 0, 1, 0, 1};
    static integer(kind=4) A.1[6] = {1, 2, 3, 4, 5, 6};

    (void) __builtin_memset ((void *) &uda1l, 0, 24);
    (void) __builtin_memcpy ((void *) &uda1r, (void *) &A.1, 24);
    (void) __builtin_memcpy ((void *) &lda, (void *) &A.2, 20);
    {
      integer(kind=8) S.3;

      S.3 = 1;
      while (1)
        {
          if (S.3 > 5) goto L.1;
          if (lda[S.3 + -1])
            {
              uda1l[S.3 + -1] = uda1r[S.3];
            }
          else
            {
              uda1l[S.3] = uda1r[6 - S.3];
            }
          S.3 = S.3 + 1;
        }
      L.1:;
    }


-- 

burnus at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |wrong-code
   Last reconfirmed|0000-00-00 00:00:00         |2008-03-29 23:23:44
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35759