This is the mail archive of the gcc-patches@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: Combine four insns


Steven Bosscher <stevenb.gcc@gmail.com> writes:

> On Tue, Aug 10, 2010 at 4:39 PM, Richard Guenther
> <richard.guenther@gmail.com> wrote:
>> You could enable the heuristic with optimize < 3 && !optimize_size
>> (thus keep combining everything at -O3 and -Os).
>
> Better s/optimize_size/optimize_bb_for_size(BLOCK_FOR_INSN (i0))/

That would mean that a -O2 build where all BBs are cold for some
reason would be 1% slower, right?

To be honest I didn't fully understand why it's ok for -Os 
to be 1% slower. A lot of people use -Os.

It seems more like a -O3 only thing for me.

-Andi

-- 
ak@linux.intel.com -- Speaking for myself only.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]