Strange variable name

Accelerated Computing HPC Compilers Legacy PGI Compilers
#1

Hi all

I have the following piece of code

!$acc data copyout(U) copy(CG_,B)
!$acc kernels
!$acc loop independent
      do J3 = J3min,J3max
        if (J3.gt.NG3/2) then
          I3 = J3 - NG3
        else
          I3 = J3
        endif
!$acc loop independent
        do J2 = J2min,J2max
          if (J2.gt.NG2/2) then
            I2 = J2 - NG2
          else
            I2 = J2
          endif
!$acc loop independent private(G)
          do J1 = 0,N1-1
            if (J1.gt.N1/2) then
              I1 = J1 - N1
            else
              I1 = J1
            endif
            G(:)= B(:,1) * I1 + B(:,2) * I2 + B(:,3) * I3
            G2 = G(1)**2 + G(2)**2 + G(3)**2
            J2L = J2 - J2min
            J3L = J3 - J3min
            J = 1 + J1 + N1 * J2L + N1 * N2 * J3L
            if (G2.LT.G2MAX .AND. G2.GT.TINY) then
              VG = 8.0_dp * PI / G2
              DU = VG * ( CG_(1,J)**2 + CG_(2,J)**2 )
              U = U + DU
              CG_(:,J) = VG * CG_(:,J)
            else
              CG_(:,J) = 0.0_dp
            endif
          enddo
        enddo
      enddo
!$acc end kernels
!$acc end data

compiler output is

arom@cuda:~/myproj/Obj$ pgfortran -c -g -Mcuda -acc -ta=nvidia:4.0,time -Minfo=accel ./poison.F
PGF90-W-0155-Compiler failed to translate accelerator region (see -Minfo messages): Could not find allocated-variable index for symbol (./poison.F: 41)
poison:
     40, Generating copyout(.sqrt)
         Generating copy(b(:,:))
         Generating copy(cg_(:,:))
     43, Loop is parallelizable
         Accelerator kernel generated
         43, !$acc loop gang, vector(256) ! blockidx%x threadidx%x
         71, Sum reduction generated for u
     50, Loop is parallelizable
     57, Loop is parallelizable
     63, Loop is parallelizable
  0 inform,   1 warnings,   0 severes, 0 fatal for poison

Two questions are

  1. what does “.sqrt” name means?
40, Generating copyout(.sqrt)

Line 40 is the line with “!$acc data”
2. what does the warning about

PGF90-W-0155-Compiler failed to translate accelerator region (see -Minfo messages): Could not find allocated-variable index for symbol

I do understand that I don’t need to place copyout clause for “U”, but anyway…

#2

Hi Alexey,

The warning is most likely because of a compiler error which in turn is causing the odd “sqrt” copyout. Would you mind sending a reproducing example to PGI Customer Service (trs@pgroup.com)? We’ll need to investigate in order to tell the exact problem.

Thanks,
Mat