Optimize prolong3: hoist bounds check out of inner loop

AMSS_NCKU_source/prolongrestrict_cell.f90

@@ -1949,11 +1949,12 @@
   real*8, dimension(6,2), parameter :: WC = reshape((/&
       C1,C2,C3,C4,C5,C6,&
       C6,C5,C4,C3,C2,C1/), (/6,2/))
-
-  integer::imini,imaxi,jmini,jmaxi,kmini,kmaxi
-  integer::imino,imaxo,jmino,jmaxo,kmino,kmaxo
-
-  real*8,dimension(3) :: CD,FD
+
+  integer::imini,imaxi,jmini,jmaxi,kmini,kmaxi
+  integer::imino,imaxo,jmino,jmaxo,kmino,kmaxo
+  integer::maxcx,maxcy,maxcz
+
+  real*8,dimension(3) :: CD,FD
   
   if(wei.ne.3)then
      write(*,*)"prolongrestrict.f90::prolong3: this routine only surport 3 dimension"
@@ -2057,6 +2058,14 @@
      endif
   enddo
 
+  maxcx = maxval(cix(imino:imaxo))
+  maxcy = maxval(ciy(jmino:jmaxo))
+  maxcz = maxval(ciz(kmino:kmaxo))
+  if(maxcx+3 > extc(1) .or. maxcy+3 > extc(2) .or. maxcz+3 > extc(3))then
+     write(*,*)"error in prolong"
+     return
+  endif
+
   call symmetry_bd(3,extc,func,funcc,SoA)
      
 !~~~~~~> prolongation start...
@@ -2069,8 +2078,6 @@
        px = pix(i)
        py = piy(j)
        pz = piz(k)
-
-       if(any(cxI+3 > extc)) write(*,*)"error in prolong"
 #if 0
        if(ii/2*2==ii)then
          if(jj/2*2==jj)then