gcc/testsuite/gfortran.dg/pr81303.f

   1 ! { dg-do compile }
   2 ! { dg-options "-O3 -ffast-math -floop-interchange -fdump-tree-linterchange-details" }
   3
   4         subroutine mat_times_vec(y,x,a,axp,ayp,azp,axm,aym,azm,
   5      $  nb,nx,ny,nz)
   6         implicit none
   7         integer nb,nx,ny,nz,i,j,k,m,l,kit,im1,ip1,jm1,jp1,km1,kp1
   8
   9         real*8 y(nb,nx,ny,nz),x(nb,nx,ny,nz)
  10
  11         real*8 a(nb,nb,nx,ny,nz),
  12      1  axp(nb,nb,nx,ny,nz),ayp(nb,nb,nx,ny,nz),azp(nb,nb,nx,ny,nz),
  13      2  axm(nb,nb,nx,ny,nz),aym(nb,nb,nx,ny,nz),azm(nb,nb,nx,ny,nz)
  14
  15
  16       do k=1,nz
  17          km1=mod(k+nz-2,nz)+1
  18          kp1=mod(k,nz)+1
  19          do j=1,ny
  20             jm1=mod(j+ny-2,ny)+1
  21             jp1=mod(j,ny)+1
  22             do i=1,nx
  23                im1=mod(i+nx-2,nx)+1
  24                ip1=mod(i,nx)+1
  25                do l=1,nb
  26                   y(l,i,j,k)=0.0d0
  27                   do m=1,nb
  28                      y(l,i,j,k)=y(l,i,j,k)+
  29      1               a(l,m,i,j,k)*x(m,i,j,k)+
  30      2               axp(l,m,i,j,k)*x(m,ip1,j,k)+
  31      3               ayp(l,m,i,j,k)*x(m,i,jp1,k)+
  32      4               azp(l,m,i,j,k)*x(m,i,j,kp1)+
  33      5               axm(l,m,i,j,k)*x(m,im1,j,k)+
  34      6               aym(l,m,i,j,k)*x(m,i,jm1,k)+
  35      7               azm(l,m,i,j,k)*x(m,i,j,km1)
  36                   enddo
  37                enddo
  38             enddo
  39          enddo
  40         enddo
  41         return
  42         end
  43
  44 ! { dg-final { scan-tree-dump-times "is interchanged" 1 "linterchange" } }