re PR fortran/69742 (ICE with -O3 and ASSOCIATE containing repeated expression)

2015-02-16  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/69742
	* frontend-passes.c (cfe-expr_0):  Don't register functions
	from within an ASSOCIATE statement.

2015-02-16  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/69742
	* gfortran.dg/associate_21.f90:  New test.

From-SVN: r233474

gcc/fortran/ChangeLog

+2015-02-16  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR fortran/69742
+	* frontend-passes.c (cfe-expr_0):  Don't register functions
+	from within an ASSOCIATE statement.
+
 2016-02-14  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/60526

gcc/fortran/frontend-passes.c

@@ -734,9 +734,9 @@ cfe_expr_0 (gfc_expr **e, int *walk_subtrees,
   gfc_expr *newvar;
   gfc_expr **ei, **ej;
 
-  /* Don't do this optimization within OMP workshare.  */
+  /* Don't do this optimization within OMP workshare or ASSOC lists.  */
 
-  if (in_omp_workshare)
+  if (in_omp_workshare || in_assoc_list)
     {
       *walk_subtrees = 0;
       return 0;

gcc/testsuite/ChangeLog

+2015-02-16  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR fortran/69742
+	* gfortran.dg/associate_21.f90:  New test.
+
 2016-02-16  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c/69835

gcc/testsuite/gfortran.dg/associate_21.f90

+! { dg-do compile }
+! { dg-options "-ffrontend-optimize" }
+! PR 69742 - this used to ICE with front-end optimizatoin
+! Original test case by Marco Restelli.
+program p
+ implicit none
+ integer, allocatable :: i(:), j
+
+  allocate( i(5) )
+  i = (/( j , j=1,5 )/)
+
+  ! The ICE appears when "size(i)" is used twice in associate
+  associate( i5 => i(size(i):size(i)) ) ! this gives ICE
+  !associate( i5 => i(size(2*i):size(i)) ) ! this works
+  i5 = 2
+  end associate
+
+  write(*,*) i
+end program p