From: Richard Biener <richard.guenther@gmail.com>
To: Claudiu Zissulescu Ianculescu <claziss@gmail.com>
Cc: Eric Botcazou <botcazou@adacore.com>, gcc@gcc.gnu.org
Subject: Re: Possible regression in DF analysis
Date: Wed, 14 Dec 2022 12:06:20 +0100 [thread overview]
Message-ID: <CAFiYyc3LVkp2L0tPHRttsmpCWEQZYQ=wPAGj06QvXqC3JbE+Uw@mail.gmail.com> (raw)
In-Reply-To: <CAL0iMy2pvs3aajUFgPZ8+=qzP_rLnEbKYHSxzMZM79-zrioiRw@mail.gmail.com>
On Wed, Dec 14, 2022 at 11:37 AM Claudiu Zissulescu Ianculescu
<claziss@gmail.com> wrote:
>
> I have update the fix to this one:
>
> diff --git a/gcc/df-core.cc b/gcc/df-core.cc
> index a901b84878f..cc6383990a1 100644
> --- a/gcc/df-core.cc
> +++ b/gcc/df-core.cc
> @@ -1437,7 +1437,16 @@ df_analyze_loop (class loop *loop)
> df_set_blocks (blocks);
> BITMAP_FREE (blocks);
>
> - df_analyze_1 ();
> + /* Iterate over loop's exit edges and add theirs destinations BB
> + indexes. */
> + struct loop_exit *exit;
> + for (exit = loop->exits->next; exit->e; exit = exit->next)
> + bitmap_set_bit (df->blocks_to_analyze, exit->e->dest->index);
I think you want to adjust the local 'blocks' bitmap passed to df_set_blocks.
There's also the issue that the computed postorder doesn't include the new
blocks and thus the computation will likely be invalid?
> +
> + if (dump_file)
> + debug_bitmap_file (dump_file, df->blocks_to_analyze);
> +
> + df_analyze ();
> }
>
> I still need to validate it for x86
>
> Best,
> Claudiu
>
> On Tue, Dec 13, 2022 at 7:38 PM Claudiu Zissulescu Ianculescu
> <claziss@gmail.com> wrote:
> >
> > >
> > > Maybe you want to iterate over the loops exit edges and include their destination block instead?
> > >
> >
> > This is better approach, let me try it and I will be back to you.
> >
> > Thanks,
> > Claudiu
next prev parent reply other threads:[~2022-12-14 11:06 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-08 10:40 Claudiu Zissulescu Ianculescu
2022-12-08 11:33 ` Eric Botcazou
2022-12-08 11:51 ` Claudiu Zissulescu Ianculescu
2022-12-13 8:41 ` Eric Botcazou
2022-12-13 12:30 ` Claudiu Zissulescu Ianculescu
2022-12-13 16:53 ` Claudiu Zissulescu Ianculescu
2022-12-13 17:01 ` Richard Biener
2022-12-13 17:38 ` Claudiu Zissulescu Ianculescu
2022-12-14 10:37 ` Claudiu Zissulescu Ianculescu
2022-12-14 11:06 ` Richard Biener [this message]
2022-12-14 11:30 ` Claudiu Zissulescu Ianculescu
2022-12-14 12:39 ` Richard Biener
2022-12-17 0:33 ` Jeff Law
[not found] ` <CAL0iMy1ad0PmprQdu6BMhHdivPz--1Yq72+n02Lj-SmxhZmxQQ@mail.gmail.com>
2022-12-20 12:34 ` Fwd: " Claudiu Zissulescu Ianculescu
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