On Tue, Jun 6, 2017 at 6:47 PM, Jeff Law <l...@redhat.com> wrote: > On 06/02/2017 05:52 AM, Bin Cheng wrote: >> Hi, >> This patch enables -ftree-loop-distribution by default at -O3 and above >> optimization levels. >> Bootstrap and test at O2/O3 on x86_64 and AArch64. is it OK? >> >> Note I don't have strong opinion here and am fine with either it's accepted >> or rejected. >> >> Thanks, >> bin >> 2017-05-31 Bin Cheng <bin.ch...@arm.com> >> >> * opts.c (default_options_table): Enable OPT_ftree_loop_distribution >> for -O3 and above levels. > I think the question is how does this generally impact the performance > of the generated code and to a lesser degree compile-time. > > Do you have any performance data? Hi Jeff, At this stage of the patch, only hmmer is impacted and improved obviously in my local run of spec2006 for x86_64 and AArch64. In long term, loop distribution is also one prerequisite transformation to handle bwaves (at least). For these two impacted cases, it helps to resolve the gap against ICC. I didn't check compilation time slow down, we can restrict it to problem with small partition number if that's a problem.
Thanks, bin > > jeff >
