public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/107727] error: multiversioning needs 'ifunc' which is not supported on this target (x86_64-w64-mingw32 target)
Date: Wed, 16 Nov 2022 21:50:15 +0000 [thread overview]
Message-ID: <bug-107727-4-IZ0dcV8keg@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-107727-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107727
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Build|x86_64-linux-gnu |
Ever confirmed|0 |1
Severity|normal |enhancement
Target|x86_64-w64-mingw32 |ones which don't support
| |ifunc
Last reconfirmed| |2022-11-16
Host|x86_64-linux-gnu |
Component|target |middle-end
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
What they do is basically have the resolver always called:
callq __cpu_indicator_init
movl __cpu_model+12(%rip), %eax
andl $1024, %eax # imm = 0x400
cmpl $1024, %eax # imm = 0x400
sete %al
andb $1, %al
testb $1, %al
jne .LBB1_1
jmp .LBB1_2
.LBB1_1:
addq $40, %rsp
jmp _Z3foov.avx2 # TAILCALL
.LBB1_2:
nop
addq $40, %rsp
jmp _Z3foov # TAILCALL
Not the fastest way of implementing this either.
A faster way to caching the result of the resolver.
Anyways we currently don't support multiversioning for non-ifuncs supported
targets. Someone will need to program up that support but it might be years
unless you pay someone to do it.
next prev parent reply other threads:[~2022-11-16 21:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-16 21:19 [Bug target/107727] New: " unlvsur at live dot com
2022-11-16 21:20 ` [Bug target/107727] " unlvsur at live dot com
2022-11-16 21:29 ` unlvsur at live dot com
2022-11-16 21:50 ` pinskia at gcc dot gnu.org
2022-11-16 21:50 ` pinskia at gcc dot gnu.org [this message]
2022-11-16 21:51 ` [Bug middle-end/107727] " pinskia 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-107727-4-IZ0dcV8keg@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).