https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66868
--- Comment #5 from Bill Schmidt <wschmidt at gcc dot gnu.org> --- Using current trunk, I compared the 193t.optimized dumps for the original cdrom.ii attachment and for the same attachment modified to add the debug output statement from the end of comment 2. Other than the added statements for the debug output, there don't appear to be any changes. This bug is marked as 5.1/6 regression -- are you certain that it regresses on trunk? Will check 5.1 the same way.