Question on patch -fprofile-partial-training

[Qing Zhao <qing.zhao@oracle.com>]

Hi, Jan,

You added the following patch into gcc10:

From 34fbe3f0946f88828765184ed6581bda62cdf49f Mon Sep 17 00:00:00 2001
From: Jan Hubicka <hubicka@ucw.cz>
Date: Thu, 5 Dec 2019 19:12:51 +0100
Subject: [PATCH] cgraphclones.c (localize_profile): New function.

        * cgraphclones.c (localize_profile): New function.
        (cgraph_node::create_clone): Use it for partial profiles.
        * common.opt (fprofile-partial-training): New flag.
        * doc/invoke.texi (-fprofile-partial-training): Document.
        * ipa-cp.c (update_profiling_info): For partial profiles do not
        set function profile to zero.
        * profile.c (compute_branch_probabilities): With partial profile
        watch if edge count is zero and turn all probabilities to guessed.
        (compute_branch_probabilities): For partial profiles do not apply
        profile when entry count is zero.
        * tree-profile.c (tree_profiling): Only do value_profile_transformations
        when profile is read.

My question is:

Can this patch be back ported to GCC8 easily? I am wondering any significant
Change between GCC8 and GCC10 that might make the backporting very hard?

Thanks a lot for your help.

Qing