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c { dg-do run }

c      PR optimization/13037

c      Contributed by Kirill Smelkov

c      bug symptom: zeta(kkzc) seems to reference to zeta(kkzc-1) instead

c      with gcc-3.2.2 it is OK, so it is a regression.

c

      subroutine bug1(expnt)

      implicit none

      double precision zeta

      common /bug1_area/zeta(3)

      double precision expnt(3)

      integer k, kkzc

      kkzc=0

      do k=1,3

         kkzc = kkzc + 1

         zeta(kkzc) = expnt(k)

      enddo

c     the following line activates the bug

      call bug1_activator(kkzc)

      end

c     dummy subroutine

      subroutine bug1_activator(inum)

      implicit none

      integer inum

      end

c     test driver

      program test_bug1

      implicit none

      double precision zeta

      common /bug1_area/zeta(3)

      double precision expnt(3)

      zeta(1) = 0.0d0

      zeta(2) = 0.0d0

      zeta(3) = 0.0d0

      expnt(1) = 1.0d0

      expnt(2) = 2.0d0

      expnt(3) = 3.0d0

      call bug1(expnt)

      if ((zeta(1).ne.1) .or. (zeta(2).ne.2) .or. (zeta(3).ne.3)) then

        call abort

      endif

      end