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! { dg-do compile { target i?86-*-* x86_64-*-* } }

! { dg-options "-O3 -mavx -mvzeroupper -mtune=generic -dp" }

      PROGRAM MG3XDEMO

      INTEGER LM, NM, NV, NR, NIT

      PARAMETER( LM=7 )

C      PARAMETER( NIT=40 )

      PARAMETER( NM=2+2**LM, NV=NM**3 )

      PARAMETER( NR = (8*(NM**3+NM**2+5*NM-23+7*LM))/7 )

C

C

C If commented line is used than there is no penalty

C       COMMON /X/ U, V, R, A, C, IR, MM

        COMMON /X/ A, C, IR, MM

      REAL*8 A(0:3),C(0:3)

      INTEGER IT, N

      INTEGER LMI, MTIME, NTIMES

C

      READ *,LMI

      READ *,NIT

      READ *,NTIMES

      READ *,U0

      READ 9004, A

      READ 9004, C

9004  FORMAT (4D8.0)

      DO I = 0, 3

        A(I) = A(I)/3.0D0

        C(I) = C(I)/64.0D0

      ENDDO

C

      N  = 2 + 2**LMI

      WRITE(6,7)N-2,N-2,N-2,NIT

 6    FORMAT( I4, 2E19.12)

 7    FORMAT(/,' KERNEL B:  SOLVING A POISSON PROBLEM ON A ',I6,' BY ',

     > I6,' BY ',I6,' GRID,',/,' USING ',I6,' MULTIGRID ITERATIONS.',/)

C

      STOP

      END

! { dg-final { scan-assembler-times "avx_vzeroupper" 1 } }