[Bug lto/49700] LTO compile time hog

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49700

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-07-11 19:56:55 UTC ---
> Extra diagnostic checks enabled; compiler may run slowly.
> Configure with --enable-checking=release to disable checks.

Also try to build the compiler with that option passed to configure.  The
defaults for the trunk has always been adding extra checking.

> CFG verifier            :  49.95 ( 1%) usr
> tree SSA verifier       : 376.24 ( 7%) usr
> tree STMT verifier      : 439.42 ( 9%) usr
> verify loop closed      : 168.68 ( 3%) usr

As you can see with the above, some verifying takes time (at least 20% of the
total time).