re PR fortran/38184 (invariant RESHAPE not expanded if SOURCE is empty)

2008-11-24  Mikael Morin  <mikael.morin@tele2.fr>

	PR fortran/38184
	* simplify.c (is_constant_array_expr): Return true instead of false
	if the array constructor is empty.

2008-11-24  Mikael Morin  <mikael.morin@tele2.fr>

	PR fortran/38184
	* gfortran.dg/reshape_empty_1.f03: New test.

From-SVN: r142168

gcc/fortran/ChangeLog

+2008-11-24  Mikael Morin  <mikael.morin@tele2.fr>
+
+	PR fortran/38184
+	* simplify.c (is_constant_array_expr): Return true instead of false
+	if the array constructor is empty.
+
 2008-11-24  Daniel Kraft  <d@domob.eu>
 
 	PR fortran/37779

gcc/fortran/simplify.c

@@ -3410,9 +3410,6 @@ is_constant_array_expr (gfc_expr *e)
   if (e->expr_type != EXPR_ARRAY || !gfc_is_constant_expr (e))
     return false;
   
-  if (e->value.constructor == NULL)
-    return false;
-  
   for (c = e->value.constructor; c; c = c->next)
     if (c->expr->expr_type != EXPR_CONSTANT)
       return false;

gcc/testsuite/ChangeLog

+2008-11-24  Mikael Morin  <mikael.morin@tele2.fr>
+
+	PR fortran/38184
+	* gfortran.dg/reshape_empty_1.f03: New test.
+
 2008-11-24  Jack Howarth  <howarth@bromo.med.uc.edu>
 
 	PR testsuite/38241

gcc/testsuite/gfortran.dg/reshape_empty_1.f03

+! { dg-do run }
+! { dg-options "-fdump-tree-original" }
+!
+! PR fortran/38184
+! invariant RESHAPE not expanded if SOURCE is empty.
+!
+! Original program by James Van Buskirk
+
+integer, parameter :: N = 3
+integer, parameter :: A(N,N) = reshape([integer::],[N,N],reshape([1],[N+1],[2]))
+integer, parameter :: K = N*A(2,2)+A(2,3)
+integer :: B(N,N) = reshape([1,2,2,2,1,2,2,2,1],[3,3])
+integer :: i
+i = 5
+if (any(A /= B)) call abort
+if (K /= i) call abort
+end
+
+! { dg-final { scan-tree-dump-times "\\\{1, 2, 2, 2, 1, 2, 2, 2, 1\\\}" 2 "original" } }
+! { dg-final { cleanup-tree-dump "original" } }