re PR middle-end/78128 (fortran/resolve.c:resolve_operator miscompiled at -O2)

2016-10-28  Richard Biener  <rguenther@suse.de>

	PR middle-end/78128
	PR middle-end/71002
	* fold-const.c (make_bit_field_ref): Only adjust alias set
	when the original alias set was zero.

From-SVN: r241645

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 37637fb..223396c 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2016-10-28  Richard Biener  <rguenther@suse.de>
+
+       PR middle-end/78128
+       PR middle-end/71002
+       * fold-const.c (make_bit_field_ref): Only adjust alias set
+       when the original alias set was zero.
+
 2016-10-28  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>
 
        * config/s390/s390.c (s390_adjust_loop_scan_osc): New function.

diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 89ed89d..eaa7c07 100644 (file)
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -3809,11 +3809,11 @@ make_bit_field_ref (location_t loc, tree inner, tree orig_inner, tree type,
 {
   tree result, bftype;
 
-  if (get_alias_set (inner) != get_alias_set (orig_inner))
+  alias_set_type iset = get_alias_set (orig_inner);
+  if (iset == 0 && get_alias_set (inner) != iset)
     inner = fold_build2 (MEM_REF, TREE_TYPE (inner),
                         build_fold_addr_expr (inner),
-                        build_int_cst
-                         (reference_alias_ptr_type (orig_inner), 0));
+                        build_int_cst (ptr_type_node, 0));
 
   if (bitpos == 0 && !reversep)
     {