[Bug gcov-profile/55674] [4.8 Regression] >20% size increase of lto/pgo binaries since r193747

[tejohnson at google dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55674

--- Comment #3 from Teresa Johnson <tejohnson at google dot com> 2012-12-13 14:49:19 UTC ---
Hi Markus,

Are you sure you have my subsequent fixes patched in, to make sure the
histogram is getting streamed through the LTO files? This was the
behavior I saw when I was debugging the original issue that I fixed
with those patches. Basically, the hotness checks before we went into
LTO were good, and after LTO the min count was 0.

Teresa

On Thu, Dec 13, 2012 at 6:46 AM, markus at trippelsdorf dot de
<gcc-bugzilla@gcc.gnu.org> wrote:
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55674
>
> --- Comment #2 from Markus Trippelsdorf <markus at trippelsdorf dot de> 2012-12-13 14:46:31 UTC ---
> In the tramp3d-v4 case, when I run with this simple debug patch:
>
> diff --git a/gcc/predict.c b/gcc/predict.c
> index 5d3de29..bf3a259 100644
> --- a/gcc/predict.c
> +++ b/gcc/predict.c
> @@ -147,6 +147,7 @@ maybe_hot_count_p (struct function *fun, gcov_type count)
>        gcc_assert (ws);
>        min_count = ws->min_counter;
>      }
> +  fprintf (stderr, "count=%i min_count=%i profile_info->sum_max=%i\n", count,
> min_count, profile_info->sum_max);
>    return (count >= min_count);
>  }
>
> it shows that in the middle of the output, min_count changes from
> 8585 to 0:
>
> ... ~600000 similar lines with  min_count=8585
> count=3 min_count=8585 profile_info->sum_max=257406300
> count=3 min_count=8585 profile_info->sum_max=257406300
> count=3 min_count=8585 profile_info->sum_max=257406300
> count=3 min_count=8585 profile_info->sum_max=257406300
> count=40 min_count=0 profile_info->sum_max=257406300
> count=61 min_count=0 profile_info->sum_max=257406300
> count=40 min_count=0 profile_info->sum_max=257406300
> count=40 min_count=0 profile_info->sum_max=257406300
> ... ~600000 similar lines with  min_count=0
>
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