--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gfortran.dg/pr52621.f90	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,20 @@
+! { dg-do compile }
+! { dg-options "-O2 -fprefetch-loop-arrays -w" }
+
+      SUBROUTINE GHDSYM(IZ,IS,LMMAX,S,LMS,Y,L2M,DRL,NLAY2,K0,DCUT)!,
+!
+      COMPLEX Y(L2M,L2M),H(33),S(LMS)
+      COMPLEX RU,CI,CZ,K0,FF,Z,Z1,Z2,Z3,ST
+!
+      DO 140 KK=1,4
+            DO 130 L=1,L2M
+               L1=L*L-L
+               DO 120 M=1,L
+                  IPM=L1+M
+                  IMM=L1-M+2
+                  S(IPM)=S(IPM)+Z3*Y(L,M)
+                  IF (M.NE.1) S(IMM)=S(IMM)+Z3*Y(M-1,L)*CSGN
+120            CONTINUE
+130         CONTINUE
+140   CONTINUE
+      END