http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57511
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
It looks like
Index: gcc/tree-scalar-evolution.c
===================================================================
--- gcc/tree-scalar-evolution.c (revision 202068)
+++ gcc/tree-scalar-evolution.c (working copy)
@@ -2252,6 +2252,7 @@ instantiate_scev_name (basic_block insta
else if (res != chrec_dont_know)
{
if (inner_loop
+ && def_bb->loop_father != inner_loop
&& !flow_loop_nested_p (def_bb->loop_father, inner_loop))
/* ??? We could try to compute the overall effect of the loop here.
*/
res = chrec_dont_know;
should be correct, but it has some testsuite fallout that needs to be
analyzed (at least uncovering an IVOPTS issue).
