From: Alexandre Oliva <aoliva@redhat.com>
To: Richard Biener <richard.guenther@gmail.com>
Cc: "Uroš Bizjak" <ubizjak@gmail.com>,
"Alan Lawrence" <alan.lawrence@arm.com>,
"Jeff Law" <law@redhat.com>,
"James Greenhalgh" <James.Greenhalgh@arm.com>,
"H.J. Lu" <hjl.tools@gmail.com>,
"Segher Boessenkool" <segher@kernel.crashing.org>,
"GCC Patches" <gcc-patches@gcc.gnu.org>,
"Christophe Lyon" <christophe.lyon@linaro.org>,
"David Edelsohn" <dje.gcc@gmail.com>,
"Eric Botcazou" <ebotcazou@adacore.com>
Subject: Re: [PR67891] drop is_gimple_reg test from set_parm_rtl
Date: Tue, 03 Nov 2015 01:11:00 -0000 [thread overview]
Message-ID: <orwptzdh01.fsf@livre.home> (raw)
In-Reply-To: <CAFiYyc1rZcnvOSkxVsSZu5gi1ozzzxNvLwA17YmM51DRj2KH=A@mail.gmail.com> (Richard Biener's message of "Wed, 14 Oct 2015 11:28:34 +0200")
On Oct 14, 2015, Richard Biener <richard.guenther@gmail.com> wrote:
> On Wed, Oct 14, 2015 at 5:25 AM, Alexandre Oliva <aoliva@redhat.com> wrote:
>> On Oct 12, 2015, Richard Biener <richard.guenther@gmail.com> wrote:
>>
>>> On Sat, Oct 10, 2015 at 3:16 PM, Alexandre Oliva <aoliva@redhat.com> wrote:
>>>> On Oct 9, 2015, Richard Biener <richard.guenther@gmail.com> wrote:
>>>>
>>>>> Ok. Note that I think emit_block_move shouldn't mess with the addressable flag.
>>>>
>>>> I have successfully tested a patch that stops it from doing so,
>>>> reverting https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49429#c11 but
>>>> according to bugs 49429 and 49454, it looks like removing it would mess
>>>> with escape analysis introduced in r175063 for bug 44194. The thread
>>>> that introduces the mark_addressable calls suggests some discomfort with
>>>> this solution, and even a suggestion that the markings should be
>>>> deferred past the end of expand, but in the end there was agreement to
>>>> go with it. https://gcc.gnu.org/ml/gcc-patches/2011-06/msg01746.html
>>
>>> Aww, indeed. Of course the issue is that we don't track pointers to the
>>> stack introduced during RTL properly.
>>
>>> Thanks for checking. Might want to add a comment before that
>>> addressable setting now that you've done the archeology.
>>
>> I decided to give the following approach a try instead. The following
>> patch was regstrapped on x86_64-linux-gnu and i686-linux-gnu.
>> Ok to install?
> It looks ok to me but lacks a comment in mark_addressable_1 why we
> do this queueing when currently expanding to RTL.
>> +/* Mark X as addressable or queue it up if called during expand. */
>> +
>> +static void
>> +mark_addressable_1 (tree x)
How about this:
/* Mark X as addressable or queue it up if called during expand. We
don't want to apply it immediately during expand because decls are
made addressable at that point due to RTL-only concerns, such as
uses of memcpy for block moves, and TREE_ADDRESSABLE changes
is_gimple_reg, which might make it seem like a variable that used
to be a gimple_reg shouldn't have been an SSA name. So we queue up
this flag setting and only apply it when we're done with GIMPLE and
only RTL issues matter. */
--
Alexandre Oliva, freedom fighter http://FSFLA.org/~lxoliva/
You must be the change you wish to see in the world. -- Gandhi
Be Free! -- http://FSFLA.org/ FSF Latin America board member
Free Software Evangelist|Red Hat Brasil GNU Toolchain Engineer
next prev parent reply other threads:[~2015-11-03 1:11 UTC|newest]
Thread overview: 121+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-27 18:04 [PR64164] drop copyrename, integrate into expand Alexandre Oliva
2015-03-27 18:11 ` Alexandre Oliva
2015-03-28 19:22 ` Alexandre Oliva
2015-03-31 5:11 ` Jeff Law
2015-04-03 13:17 ` Alexandre Oliva
2015-04-06 16:08 ` Jeff Law
2015-04-24 1:56 ` Alexandre Oliva
2015-04-27 11:39 ` Richard Biener
2015-06-06 5:12 ` Alexandre Oliva
2015-06-08 8:16 ` Richard Biener
2015-06-09 8:58 ` Christophe Lyon
2015-06-10 0:28 ` Alexandre Oliva
2015-06-10 13:36 ` Richard Biener
2015-07-16 7:58 ` Alexandre Oliva
2015-07-16 8:50 ` Richard Biener
2015-07-16 21:33 ` Alexandre Oliva
2015-07-18 8:26 ` Alexandre Oliva
2015-07-21 13:25 ` Richard Biener
2015-07-22 17:13 ` Alexandre Oliva
2015-07-22 17:43 ` Alexandre Oliva
2015-07-23 11:04 ` Richard Biener
2015-07-23 15:42 ` Alexandre Oliva
2015-07-23 20:35 ` Segher Boessenkool
2015-07-23 21:24 ` H.J. Lu
2015-07-23 22:11 ` H.J. Lu
2015-07-24 1:31 ` David Edelsohn
2015-07-24 5:08 ` H.J. Lu
2015-07-24 9:26 ` Richard Biener
2015-07-24 12:50 ` H.J. Lu
2015-07-24 20:20 ` Alexandre Oliva
2015-07-25 2:37 ` David Edelsohn
2015-07-27 22:16 ` Alexandre Oliva
2015-07-27 22:31 ` H.J. Lu
2015-07-24 18:51 ` Alexandre Oliva
2015-07-24 19:12 ` H.J. Lu
2015-07-24 19:31 ` David Edelsohn
2015-07-24 20:43 ` Alexandre Oliva
2015-07-24 20:47 ` Alexandre Oliva
2015-07-24 21:53 ` H.J. Lu
2015-07-25 7:17 ` Richard Biener
2015-07-29 20:52 ` Alexandre Oliva
2015-07-29 21:06 ` H.J. Lu
2015-07-30 17:47 ` H.J. Lu
2015-08-03 23:46 ` Alexandre Oliva
2015-08-04 9:48 ` Richard Biener
2015-08-05 0:39 ` Alexandre Oliva
2015-08-05 9:14 ` Richard Biener
2015-08-05 23:03 ` Alexandre Oliva
2015-08-10 8:24 ` James Greenhalgh
2015-08-10 15:14 ` Jeff Law
2015-08-11 4:53 ` Patrick Marlier
2015-08-14 19:03 ` Alexandre Oliva
2015-08-15 8:57 ` Andreas Schwab
2015-08-16 13:00 ` Alexandre Oliva
[not found] ` <m2k2sv8s21.fsf@linux-m68k.org>
2015-08-17 5:05 ` Alexandre Oliva
2015-08-17 9:29 ` Kyrill Tkachov
2015-08-17 16:23 ` Andrew Pinski
2015-08-18 16:18 ` Kyrill Tkachov
2015-08-16 16:42 ` Andreas Schwab
2015-08-17 2:57 ` Alexandre Oliva
2015-08-17 8:23 ` Andreas Schwab
2015-08-17 9:21 ` Andreas Schwab
2015-08-17 11:58 ` Alexandre Oliva
2015-08-17 7:48 ` Christophe Lyon
2015-08-17 12:43 ` Alexandre Oliva
2015-08-17 13:39 ` Christophe Lyon
2015-08-18 6:53 ` Alexandre Oliva
2015-08-19 6:50 ` Alexandre Oliva
2015-08-19 10:17 ` Richard Biener
2015-08-19 13:35 ` Andreas Schwab
2015-08-19 13:45 ` Andreas Schwab
2015-08-19 17:48 ` Alexandre Oliva
2015-08-20 1:44 ` Alexandre Oliva
2015-08-20 17:03 ` Jeff Law
2015-08-21 7:57 ` Alexandre Oliva
2015-08-21 8:38 ` Richard Biener
2015-08-21 12:17 ` Andreas Schwab
2015-08-21 8:11 ` Alexandre Oliva
2015-08-21 8:37 ` Richard Biener
2015-09-02 17:09 ` Alan Lawrence
2015-09-02 22:34 ` Alexandre Oliva
2015-09-03 10:58 ` Alan Lawrence
2015-09-18 15:49 ` Alan Lawrence
2015-09-23 20:44 ` Alexandre Oliva
2015-09-25 11:39 ` Richard Biener
2015-10-09 5:26 ` [PR67828] don't unswitch loops on undefined SSA values (was: Re: [PR64164] drop copyrename, integrate into expand) Alexandre Oliva
2015-10-09 9:35 ` Richard Biener
2015-10-09 5:36 ` [PR67766] reorder return value copying from PARALLELs and CONCATs " Alexandre Oliva
2015-10-09 7:33 ` [PR67891] drop is_gimple_reg test from set_parm_rtl (was: [PR67766] reorder return value copying from PARALLELs and CONCATs) Alexandre Oliva
2015-10-09 9:40 ` Richard Biener
2015-10-10 13:20 ` [PR67891] drop is_gimple_reg test from set_parm_rtl Alexandre Oliva
2015-10-12 10:22 ` Richard Biener
2015-10-14 3:25 ` Alexandre Oliva
2015-10-14 9:28 ` Richard Biener
2015-11-03 1:11 ` Alexandre Oliva [this message]
2015-11-03 3:14 ` Jeff Law
2015-11-03 4:29 ` Alexandre Oliva
2022-10-17 12:08 ` Tag 'gcc/gimple-expr.cc:mark_addressable_2' as 'static' (was: [PR67891] drop is_gimple_reg test from set_parm_rtl) Thomas Schwinge
2015-10-09 9:36 ` [PR67766] reorder return value copying from PARALLELs and CONCATs (was: Re: [PR64164] drop copyrename, integrate into expand) Richard Biener
2015-09-29 11:31 ` [PR64164] drop copyrename, integrate into expand Szabolcs Nagy
2015-10-07 22:37 ` Alexandre Oliva
2015-10-08 10:00 ` Richard Biener
2015-10-09 21:10 ` Jeff Law
2015-11-05 5:09 ` Alexandre Oliva
2015-11-05 13:44 ` Richard Biener
2015-11-10 15:31 ` Alan Lawrence
2015-11-10 22:59 ` Alexandre Oliva
2015-11-10 23:43 ` Jeff Law
2015-11-11 18:10 ` Alexandre Oliva
2015-11-13 6:33 ` Jeff Law
2015-11-17 0:07 ` Alexandre Oliva
2015-11-24 5:41 ` Jeff Law
2015-07-24 18:21 ` Alexandre Oliva
2015-07-29 20:32 ` Alexandre Oliva
2015-04-29 3:51 ` Jeff Law
2015-03-31 6:55 ` Steven Bosscher
2015-03-31 13:30 ` Richard Biener
2015-03-31 14:06 ` Richard Biener
2015-04-03 13:30 ` Alexandre Oliva
2015-04-06 15:57 ` Jeff Law
2015-12-04 12:45 ` Dominik Vogt
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