public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/100152] [10/11/12 Regression] used caller-saved register not preserved across a call.
Date: Fri, 23 Apr 2021 12:57:27 +0000 [thread overview]
Message-ID: <bug-100152-4-cUxsFTDcEh@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-100152-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100152
--- Comment #39 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Iain Sandoe from comment #38)
> (In reply to Richard Biener from comment #37)
> > Oh, and FYI a cc1 cross from x86_64 to x86_64-apple-darwin19.6.0 doesn't seem
> > to reproduce the issue with the reduced testcase (I seee no call to
> > ___UTF_8_put remaining with -O3 -fPIC -fno-strict-aliasing -fwrapv).
>
> I think my interestingness test isn't strict enough - the creduced code
> resulting doesn't have an extern for ___UTF_8_put and only seems to not
> inline that fn because the interface has been mangled. [ so that the fn is
> legitimately binds_localP as the pasted case ].
>
> if you still have the build around, out of curiosity, does it fail on the
> original .i file attached here?
>
> and with -fno-trapping-math -fno-math-errno -fschedule-insns2
> -fomit-frame-pointer
>
> ( I only need O2 to get a fail ).
Yes, with -O2 -fno-trapping-math -fno-math-errno -fschedule-insns2
-fomit-frame-pointer it produces the problematical
.align 4,0x90
L945:
movl 0(%rbp,%r10,4), %esi
call ____UTF_8_put
movq %r10, %rax
addq $1, %r10
cmpq %rax, %r12
jne L945
code. But then ___UTF_8_put isn't interposable so I wonder why the linker
even has to resolve anything. Adding -fPIC OTOH should definitely make the
symbol interposable but the same code is still generated ...
Note the 'extern' declaration shouldn't change anything, only that we
see a definition is relevant.
breaking on darwin_binds_local_p I see ___UTF_8_put is considered binding
local even with -fPIC. So GCC thinks there will be no linker stub involved.
Note 'shlib' is passed as false to default_binds_local_p_3 computed as
3140 on earlier system versions, and with a TODO to complete. */
3141 bool force_overridable = TARGET_KEXTABI && DARWIN_VTABLE_P (decl);
3142 return default_binds_local_p_3 (decl, force_overridable /* shlib */,
3143 false /* weak dominate */,
and default_binds_local_p_3 would do
/* If PIC, then assume that any global name can be overridden by
symbols resolved from other modules. */
if (shlib)
return false;
ix86_binds_local_p simply passes flag_shlib != 0 as this argument.
next prev parent reply other threads:[~2021-04-23 12:57 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-20 13:48 [Bug target/100152] New: Possible 10.3 bad code generation regression from 10.2/9.3 on Mac OS 10.15.7 (Catalina) lucier at math dot purdue.edu
2021-04-20 13:48 ` [Bug target/100152] " lucier at math dot purdue.edu
2021-04-20 13:50 ` lucier at math dot purdue.edu
2021-04-20 14:33 ` iains at gcc dot gnu.org
2021-04-20 14:36 ` iains at gcc dot gnu.org
2021-04-20 14:40 ` lucier at math dot purdue.edu
2021-04-20 14:43 ` iains at gcc dot gnu.org
2021-04-20 14:58 ` lucier at math dot purdue.edu
2021-04-20 15:02 ` iains at gcc dot gnu.org
2021-04-20 15:09 ` lucier at math dot purdue.edu
2021-04-20 15:13 ` lucier at math dot purdue.edu
2021-04-20 15:17 ` iains at gcc dot gnu.org
2021-04-20 15:24 ` lucier at math dot purdue.edu
2021-04-20 17:22 ` lucier at math dot purdue.edu
2021-04-21 4:27 ` gabravier at gmail dot com
2021-04-21 8:52 ` iains at gcc dot gnu.org
2021-04-21 13:17 ` lucier at math dot purdue.edu
2021-04-21 15:32 ` iains at gcc dot gnu.org
2021-04-21 18:12 ` lucier at math dot purdue.edu
2021-04-21 18:18 ` iains at gcc dot gnu.org
2021-04-21 18:29 ` iains at gcc dot gnu.org
2021-04-21 20:00 ` iains at gcc dot gnu.org
2021-04-21 20:38 ` iains at gcc dot gnu.org
2021-04-21 23:24 ` lucier at math dot purdue.edu
2021-04-22 10:28 ` [Bug target/100152] [10.3, 11, 12 Regression] [Darwin, X86] used caller-saved register not preserved across a call iains at gcc dot gnu.org
2021-04-22 12:54 ` lucier at math dot purdue.edu
2021-04-22 14:35 ` feeley at iro dot umontreal.ca
2021-04-22 23:13 ` [Bug target/100152] [10.3, 11, 12 Regression] " iains at gcc dot gnu.org
2021-04-23 0:32 ` iains at gcc dot gnu.org
2021-04-23 6:51 ` iains at gcc dot gnu.org
2021-04-23 8:13 ` [Bug target/100152] [10/11/12 " rguenth at gcc dot gnu.org
2021-04-23 8:32 ` iains at gcc dot gnu.org
2021-04-23 8:48 ` iains at gcc dot gnu.org
2021-04-23 8:54 ` rguenth at gcc dot gnu.org
2021-04-23 8:58 ` rguenth at gcc dot gnu.org
2021-04-23 9:05 ` rguenth at gcc dot gnu.org
2021-04-23 9:09 ` iains at gcc dot gnu.org
2021-04-23 11:02 ` rguenth at gcc dot gnu.org
2021-04-23 12:34 ` iains at gcc dot gnu.org
2021-04-23 12:57 ` rguenth at gcc dot gnu.org [this message]
2021-04-23 12:58 ` rguenth at gcc dot gnu.org
2021-04-23 13:13 ` iains at gcc dot gnu.org
2021-04-24 12:41 ` iains at gcc dot gnu.org
2021-04-24 12:45 ` cvs-commit at gcc dot gnu.org
2021-04-24 18:45 ` iains at gcc dot gnu.org
2021-05-02 15:36 ` iains at gcc dot gnu.org
2021-05-03 7:54 ` iains at gcc dot gnu.org
2021-05-09 1:57 ` lucier at math dot purdue.edu
2021-05-09 7:25 ` iains at gcc dot gnu.org
2021-05-09 15:43 ` lucier at math dot purdue.edu
2021-05-09 19:22 ` iains at gcc dot gnu.org
2021-05-09 20:00 ` lucier at math dot purdue.edu
2021-05-09 22:36 ` iains at gcc dot gnu.org
2021-05-11 7:48 ` iains at gcc dot gnu.org
2021-05-13 3:35 ` lucier at math dot purdue.edu
2021-05-14 14:04 ` jakub at gcc dot gnu.org
2021-07-09 16:42 ` cvs-commit at gcc dot gnu.org
2021-07-20 6:52 ` cvs-commit at gcc dot gnu.org
2021-07-20 7:00 ` [Bug target/100152] [10 " iains at gcc dot gnu.org
2021-07-22 15:21 ` lucier at math dot purdue.edu
2022-05-29 19:13 ` cvs-commit at gcc dot gnu.org
2022-05-29 19:25 ` iains at gcc dot gnu.org
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=bug-100152-4-cUxsFTDcEh@http.gcc.gnu.org/bugzilla/ \
--to=gcc-bugzilla@gcc.gnu.org \
--cc=gcc-bugs@gcc.gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).