[Bug fortran/34006] New: vectorization with 64-bit integers

[valera dot veryazov at teokem dot lu dot se]

Hi, 
the code (see below) compiled with 
gfortran -O2 -Wall -fdefault-integer-8 -ftree-vectorize a.f
gives a complete garbage, since compiler changing the order of execution 
inside the loop. 
=========================

     DIMENSION Nvec(10),iVEC(10)
      do i=1,10
        Nvec(i)=i
      enddo
      call Zbase(Nvec,iVec,10)
      print *,iVec
      end

      SUBROUTINE ZBASE(NVEC,IVEC,NCLASS)
      DIMENSION NVEC(NCLASS),IVEC(NCLASS)
      IVEC(1) = 1
      DO 100 ICLASS = 2,NCLASS
        IVEC(ICLASS) = IVEC(ICLASS-1)+NVEC(ICLASS-1)
  100 CONTINUE

      RETURN
      END



=========================



Removing -ftree-vectorize, or -fdefault-integer-8, or changing loop to 
'Do 100 ICLASS= 2, 10' solves the problem.

           Best Regards,
                    Valera.


-- 
           Summary: vectorization with 64-bit integers
           Product: gcc
           Version: 4.1.1
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: valera dot veryazov at teokem dot lu dot se
  GCC host triplet: Linux_x86-64 CentOS


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34006