Problem with processing multidimensional arrays via nested loops

Hello,

we are frustrating with a weird problem caused by the latest Intel's compiler suites (ifort/icc v14.0.2.144, Linux x86_64/EM64T). Depending on the optimization level, the following code generates different results:

CSTART

        subroutine MakeWwdHlp2 (Ww,W1,dima,dimbe,dimga)
        implicit none
        integer dima,dimb,dimab,dimbe,dimga,key
        real*8 Ww(1:dima,1:dimbe,1:dimga)
        real*8 W1(1:dima,1:dimbe,1:dima,1:dimga)

        integer a,be,ga

        do ga=1,dimga
        do be=1,dimbe
        do a=1,dima
          Ww(a,be,ga)=W1(a,be,a,ga)
        end do
        end do
        end do
C Uncomment to get correct results/loop's counters
c       print *,ga,be,a

        return
        end

CEND

The '-O0' as well as '-O1' optimization levels give us correct results while '-O2' doesn't. If the printing line is uncommented then results become always correct, regardless the optimization level used. The 'dimga','dima', and 'dimbe' counters are in the range [10,12]. Enclosed please find the assembler listing generated via '-00','-O1', and '-O2'.

It would be great to identify the compler's option that causes the problem.

Thank in advance!

Victor.