https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78676
janus at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[5/6/7 Regression] |[5/6/7 Regression]
|Optimizer bug exposed by |Optimizer bug with
|program with many bit |-ftree-vrp exposed by
|operations |program with many bit
| |operations
--- Comment #6 from janus at gcc dot gnu.org ---
(In reply to janus from comment #5)
> gfortran 4.7 and 4.8 print at all optimization levels:
>
> -682598705 58
> 1741342173 32
>
> That's also what 4.9 prints at -00 and -01. But then 4.9 (and upwards) print
> at -O2 and -O3:
>
> -682598705 57
> 1741342172 32
>
> The error goes away if I remove the loop (even though it occurs already for
> i=1).
The latter is printed by 4.9 also with "-O1 -ftree-vrp", but not with
"-ftree-vrp" alone. In any case, this flag seems to be the culprit here.
