On Wed, Jul 23, 2014 at 2:39 AM, Pengfei Yuan <0xcool...@gmail.com> wrote: > In the experiment, about 60% (1019/1699) profile data files are empty > (all counters are zero).
Well, but you are globally overriding options even for the parts with profile. The whole point of profile-feedback is to get at the interesting parts (those with non-zero counters). What you say is that not enough parts of the compiler care for the actual profiles and thus portions with all-zero counters are treated as if they were hot? Then better fix that. Richard. > 2014-07-22 21:39 GMT+08:00 Richard Biener <richard.guent...@gmail.com>: >> On Mon, Jul 21, 2014 at 7:13 AM, Pengfei Yuan <0xcool...@gmail.com> wrote: >>> Hi, >>> >>> This patch tunes optimization options based on profile data: >>> * Disable PGO options if profile is not available or empty. >>> * Optimize for size if profile is available but empty. >> >> Err ... these don't seem interesting cases to "optimize" for? >> >> Richard.
