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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/102622] [12 Regression] Wrong code with -O3 for skylake-avx512 and icelake-server by r12-3903
Date: Wed, 06 Oct 2021 12:55:52 +0000	[thread overview]
Message-ID: <bug-102622-4-GjrejJH9S2@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-102622-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102622

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Aldy Hernandez from comment #4)
> (In reply to Andrew Pinski from comment #3)
> > (In reply to Andrew Pinski from comment #2)
> > > Here is a slightly more reduced testcase (without the reasonable values):
> > 
> > Looks like the store to var_22 was fully removed, I think this is not a
> > vectorizer bug really, but rather some issue with jump threading ....
> 
> I'm getting an illegal instruction, so perhaps I don't have a machine with
> the appropriate hardware.  I even get the illegal instruction with
> -fno-thread-jumps:
> 
> (base) abulafia:~/bld/t/gcc$ ./xg++ -B./ a.c -O3
> -L/usr/lib/gcc/x86_64-redhat-linux/11/ -march=skylake-avx512                
> (base) abulafia:~/bld/t/gcc$ ./a.out
> Illegal instruction (core dumped)

You can download Intel SDE to run it:

https://software.intel.com/content/www/us/en/develop/articles/intel-software-development-emulator.html

> Can you try with -fno-thread-jumps to make sure its really the threader at
> play?

I will give it a try.

  parent reply	other threads:[~2021-10-06 12:55 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-05 19:37 [Bug tree-optimization/102622] New: Wrong code with -O3 for skylake-avx512 and icelake-server vsevolod.livinskij at frtk dot ru
2021-10-05 22:21 ` [Bug tree-optimization/102622] [12 Regression] " pinskia at gcc dot gnu.org
2021-10-05 22:36 ` pinskia at gcc dot gnu.org
2021-10-05 23:31 ` pinskia at gcc dot gnu.org
2021-10-06  7:23 ` [Bug tree-optimization/102622] [12 Regression] Wrong code with -O3 for skylake-avx512 and icelake-server by r12-3903 aldyh at gcc dot gnu.org
2021-10-06  8:42 ` rguenth at gcc dot gnu.org
2021-10-06 12:55 ` hjl.tools at gmail dot com [this message]
2021-10-06 13:04 ` hjl.tools at gmail dot com
2021-10-06 13:10 ` aldyh at gcc dot gnu.org
2021-10-06 13:12 ` aldyh at gcc dot gnu.org
2021-10-06 13:26 ` hjl.tools at gmail dot com
2021-10-06 14:19 ` aldyh at redhat dot com
2021-10-06 14:21 ` hjl.tools at gmail dot com
2021-10-07 16:07 ` aldyh at gcc dot gnu.org
2021-10-07 21:29 ` pinskia at gcc dot gnu.org
2021-10-07 21:31 ` pinskia at gcc dot gnu.org
2021-10-08  6:04 ` pinskia at gcc dot gnu.org
2021-10-09 22:25 ` pinskia at gcc dot gnu.org
2021-10-10  1:05 ` [Bug tree-optimization/102622] [9/10/12 Regression] Wrong code with -O1 and above due to phiopt and signed one bit integer types pinskia at gcc dot gnu.org
2021-10-10  1:54 ` pinskia at gcc dot gnu.org
2021-10-10  5:49 ` pinskia at gcc dot gnu.org
2021-10-10  9:04 ` cvs-commit at gcc dot gnu.org
2021-10-10  9:06 ` [Bug tree-optimization/102622] [9/10 " pinskia at gcc dot gnu.org
2021-10-10  9:18 ` pinskia at gcc dot gnu.org
2021-10-10 23:21 ` pinskia at gcc dot gnu.org
2021-10-11  9:22 ` cvs-commit at gcc dot gnu.org
2021-10-11  9:24 ` [Bug tree-optimization/102622] [9 " pinskia at gcc dot gnu.org
2021-10-11 21:07 ` cvs-commit at gcc dot gnu.org
2021-10-11 21:08 ` pinskia at gcc dot gnu.org
2021-10-11 21:19 ` cvs-commit at gcc dot gnu.org
2021-11-09 19:03 ` cvs-commit at gcc dot gnu.org

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