From: Peter Bergner <bergner@linux.ibm.com>
To: Segher Boessenkool <segher@kernel.crashing.org>,
Jakub Jelinek <jakub@redhat.com>
Cc: Michael Meissner <meissner@linux.ibm.com>,
gcc@gcc.gnu.org, Thomas Koenig <tkoenig@netcologne.de>,
fortran@gcc.gnu.org, Tobias Burnus <tobias@codesourcery.com>,
Jonathan Wakely <jwakely@redhat.com>
Subject: Re: libgfortran.so SONAME and powerpc64le-linux ABI changes
Date: Wed, 6 Oct 2021 14:30:03 -0500 [thread overview]
Message-ID: <c5ab3a6f-fa24-1faa-73ff-24eea37d0c6f@linux.ibm.com> (raw)
In-Reply-To: <20211006175041.GJ10333@gate.crashing.org>
On 10/6/21 12:50 PM, Segher Boessenkool wrote:
> So we have three options (well, four):
>
> 0) Do nothing. We will stay in this hell forever. Not my choice :-)
> 1) Use a soft-float-like parameter passing everywhere. This works but
> will be horridly slow on newer systems. We can do better than that.
> 2) Use the current setup where -mcpu=power8 (or later) makes QP float
> available. Most BE stuff isn't compiled with that currently, and it
> will split our ecosystem.
> 3) As Joseph reminds me the high VSRs are the VRs, so we could use the
> same parameter passing on anything with AltiVec. We could even
> simply require -maltivec for QP float to be supported (we currently
> require -mvsx, this would not be a restriction).
>
> I think I like 3) :-)
I like 3 too, meaning requiring -maltivec to support IEEE QP at all.
This would cover POWER6 and later server CPUs, as well as some other
cpus like in the Power Macs.
Anything without Altivec hardware would need to either not support
IEEE QP at all, or go through the work themselves of coming up with
a -msoft-altivec like ABI.
Peter
next prev parent reply other threads:[~2021-10-06 19:30 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-04 10:07 Jakub Jelinek
2021-10-04 11:24 ` Richard Biener
2021-10-04 11:36 ` Jakub Jelinek
2021-10-04 12:31 ` Jakub Jelinek
2021-10-04 14:14 ` Jakub Jelinek
2021-10-04 16:47 ` Joseph Myers
2021-10-04 18:33 ` Segher Boessenkool
2021-10-04 19:24 ` Joseph Myers
2021-10-05 17:43 ` Segher Boessenkool
2021-10-14 19:39 ` Bill Schmidt
2021-10-15 0:26 ` Segher Boessenkool
2021-10-05 20:16 ` Thomas Koenig
2021-10-05 21:54 ` Segher Boessenkool
2021-10-06 6:59 ` Thomas Koenig
2021-10-06 15:17 ` Segher Boessenkool
2021-10-06 15:41 ` Jakub Jelinek
2021-10-06 16:07 ` Segher Boessenkool
2021-10-06 16:34 ` Jakub Jelinek
2021-10-06 16:59 ` Segher Boessenkool
2021-10-06 17:07 ` Jakub Jelinek
2021-10-06 17:50 ` Segher Boessenkool
2021-10-06 19:30 ` Peter Bergner [this message]
2021-10-06 17:13 ` Joseph Myers
2021-10-06 18:39 ` Segher Boessenkool
2021-10-06 19:42 ` Joseph Myers
2021-10-06 20:57 ` Segher Boessenkool
2021-10-06 21:55 ` Joseph Myers
2021-10-06 22:03 ` Joseph Myers
2021-10-08 17:53 ` Segher Boessenkool
2021-10-11 20:11 ` Joseph Myers
2021-10-15 0:16 ` Segher Boessenkool
2021-10-06 15:42 ` David Edelsohn
2021-10-06 16:19 ` Segher Boessenkool
2021-10-06 17:38 ` David Edelsohn
2021-10-07 3:42 ` Michael Meissner
2021-10-08 21:10 ` Segher Boessenkool
2021-10-07 9:48 ` Alastair McKinstry
2021-10-07 9:56 ` Andreas Schwab
2021-10-07 10:01 ` Jakub Jelinek
2021-10-07 12:43 ` Alastair McKinstry
2021-10-05 21:53 ` Jonathan Wakely
2021-10-07 3:35 ` Michael Meissner
2021-10-07 6:08 ` Thomas Koenig
2021-10-07 9:40 ` Jakub Jelinek
2021-10-07 15:24 ` Michael Meissner
2021-10-07 15:33 ` Jakub Jelinek
2021-10-08 6:35 ` Thomas Koenig
2021-10-08 7:20 ` Iain Sandoe
2021-10-08 16:26 ` Thomas Koenig
2021-10-08 19:11 ` Iain Sandoe
2021-10-08 22:55 ` Thomas Koenig
2021-10-08 23:18 ` Iain Sandoe
2021-10-09 9:11 ` Thomas Koenig
2021-10-09 9:19 ` Iain Sandoe
2021-10-09 9:25 ` Jakub Jelinek
2021-10-09 7:44 ` Andreas Schwab
2021-10-10 16:14 ` Florian Weimer
2021-10-15 13:50 ` Bill Schmidt
2021-10-15 14:20 ` Jakub Jelinek
2021-10-15 18:05 ` Thomas Koenig
2021-10-15 18:11 ` Jakub Jelinek
2021-10-15 18:58 ` Thomas Koenig
2021-10-15 22:24 ` Segher Boessenkool
2021-10-15 22:36 ` Segher Boessenkool
2021-10-18 19:02 ` Joseph Myers
2021-10-28 3:10 ` Michael Meissner
2021-10-29 3:36 ` libgfortran.so SONAME and powerpc64le-linux ABI changes (work in progress patches) Michael Meissner
2021-10-29 19:07 ` Thomas Koenig
2021-10-29 21:06 ` Michael Meissner
2021-11-01 15:56 ` Bill Schmidt
2021-11-02 15:40 ` Michael Meissner
2021-10-30 0:16 ` libgfortran.so SONAME and powerpc64le-linux ABI changes (2nd patch) Michael Meissner
2021-10-30 9:30 ` Thomas Koenig
2021-10-30 10:03 ` Jakub Jelinek
2021-10-30 10:31 ` Thomas Koenig
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