1c      PR optimization/13037
2c      Contributed by Kirill Smelkov
3c      bug symptom: zeta(kkzc) seems to reference to zeta(kkzc-1) instead
4c      with gcc-3.2.2 it is OK, so it is a regression.
5c
6      subroutine bug1(expnt)
7      implicit none
8
9      double precision zeta
10      common /bug1_area/zeta(3)
11
12      double precision expnt(3)
13
14
15      integer k, kkzc
16
17      kkzc=0
18      do k=1,3
19         kkzc = kkzc + 1
20         zeta(kkzc) = expnt(k)
21      enddo
22
23c     the following line activates the bug
24      call bug1_activator(kkzc)
25      end
26
27
28c     dummy subroutine
29      subroutine bug1_activator(inum)
30      implicit none
31      integer inum
32      end
33
34
35c     test driver
36      program test_bug1
37      implicit none
38
39      double precision zeta
40      common /bug1_area/zeta(3)
41
42      double precision expnt(3)
43
44      zeta(1) = 0.0d0
45      zeta(2) = 0.0d0
46      zeta(3) = 0.0d0
47
48      expnt(1) = 1.0d0
49      expnt(2) = 2.0d0
50      expnt(3) = 3.0d0
51
52      call bug1(expnt)
53      if ((zeta(1).ne.1) .or. (zeta(2).ne.2) .or. (zeta(3).ne.3)) then
54        call abort
55      endif
56
57      end
58
59