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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/102043] Wrong array types used for negative stride
 accesses
Date: Sun, 14 Nov 2021 09:38:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102043

Thomas Koenig <tkoenig at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sandra at codesourcery dot=
 com

--- Comment #15 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
One possibility would be to extend the patch Sandra posted at
https://gcc.gnu.org/pipermail/fortran/2021-January/055563.html
to scalarization.  With the patch,

the snippet

   integer :: i,j
   integer :: a(4, 4)
   do j=3D1,size(a,2)
     do i=3D1,size(a,1)
       a(i,j) =3D 0
     end do
   end do

is translated to

  while (1)
    {
      {
        logical(kind=3D4) D.4265;

        D.4265 =3D j > 4;
        if (D.4265) goto L.4;
        i =3D 1;
        while (1)
          {
            {
              logical(kind=3D4) D.4268;

              D.4268 =3D i > 4;
              if (D.4268) goto L.6;
                            typedef integer(kind=3D4) [1:4];
                            typedef integer(kind=3D4) [1:4][1:4];
              ((integer(kind=3D4)[1:4][1:4]) a)[(integer(kind=3D8)) j]{lb: =
1 sz:
16}[(integer(kind=3D8)) i]{lb: 1 sz: 4} =3D 0;
              L.5:;
              i =3D i + 1;
            }
          }
        L.6:;
        L.3:;
        j =3D j + 1;
      }
    }

which looks good.=