[Bug tree-optimization/66868] [5/6 Regression] wrong code generated with -O3 (dead code removal?)

[wschmidt at gcc dot gnu.org]

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.