Re: [PATCH] Fix profile count comparison.

[Richard Biener <richard.guenther@gmail.com>]

On Fri, Sep 23, 2022 at 8:53 PM Eugene Rozenfeld via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
> The comparison was incorrect when the counts weren't PRECISE.
> For example, crossmodule-indir-call-topn-1.c was failing
> with AutoFDO: when count_sum is 0 with quality AFDO,
> count_sum > profile_count::zero() evaluates to true. Taking that
> branch then leads to an assert in the call to to_sreal().
>
> Tested on x86_64-pc-linux-gnu.

OK

> gcc/ChangeLog:
>
>         * ipa-cp.cc (good_cloning_opportunity_p): Fix profile count comparison.
> ---
>  gcc/ipa-cp.cc | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/gcc/ipa-cp.cc b/gcc/ipa-cp.cc
> index 543a9334e2c..66bba71c068 100644
> --- a/gcc/ipa-cp.cc
> +++ b/gcc/ipa-cp.cc
> @@ -3338,9 +3338,9 @@ good_cloning_opportunity_p (struct cgraph_node *node, sreal time_benefit,
>
>    ipa_node_params *info = ipa_node_params_sum->get (node);
>    int eval_threshold = opt_for_fn (node->decl, param_ipa_cp_eval_threshold);
> -  if (count_sum > profile_count::zero ())
> +  if (count_sum.nonzero_p ())
>      {
> -      gcc_assert (base_count > profile_count::zero ());
> +      gcc_assert (base_count.nonzero_p ());
>        sreal factor = count_sum.probability_in (base_count).to_sreal ();
>        sreal evaluation = (time_benefit * factor) / size_cost;
>        evaluation = incorporate_penalties (node, info, evaluation);
> --
> 2.25.1