http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55079
--- Comment #6 from Jan Hubicka <hubicka at gcc dot gnu.org> 2012-11-02
18:44:37 UTC ---
Hmm, it seems to be due to off-by-one bug in my patch
Index: tree-ssa-loop-ivcanon.c
===================================================================
--- tree-ssa-loop-ivcanon.c (revision 193098)
+++ tree-ssa-loop-ivcanon.c (working copy)
@@ -405,11 +405,11 @@ remove_exits_and_undefined_stmts (struct
into unreachable (or trap when debugging experience is supposed
to be good). */
if (!elt->is_exit
- && elt->bound.ult (double_int::from_uhwi (npeeled)))
+ && elt->bound.ule (double_int::from_uhwi (npeeled)))
{
gimple_stmt_iterator gsi = gsi_for_stmt (elt->stmt);
gimple stmt = gimple_build_call
(builtin_decl_implicit (BUILT_IN_UNREACHABLE), 0);
gimple_set_location (stmt, gimple_location (elt->stmt));
gsi_insert_before (&gsi, stmt, GSI_NEW_STMT);
I however introduced it because w/o it we get bootstrap miscompare. Looks like
I will need to debug it after all :(
