This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: Faster compilation speed

David Edelsohn <dje@watson.ibm.com> writes:

> 	Here's an interesting (aka depressing) data point.  My previous
> cache miss statistics were for GCC -O2.  At -O0, GCC's cache miss
> statistics stay the same or get up to 20% *worse*.  In comparison, the
> cache statistics for IBM's compiler without optimization enabled *improve*
> up to 50 for the same reload.c and insn-recog.c input files compared to
> optimized.
> 
> 	GCC has some sort of overhead, maybe the tree->RTL conversion as
> Dan mentioned, which really hurts re-use at -O0.

Could you try with -fsyntax-only?

-- 
- Geoffrey Keating <geoffk@geoffk.org> <geoffk@redhat.com>
Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]