From: Segher Boessenkool <segher@kernel.crashing.org>
To: "Michael Meissner" <meissner@linux.ibm.com>,
"Jonathan Wakely" <jwakely.gcc@gmail.com>,
"Joseph Myers" <joseph@codesourcery.com>,
"Jason Merrill" <jason@redhat.com>,
"Ulrich Weigand" <uweigand@de.ibm.com>,
"Pat Haugen" <pthaugen@us.ibm.com>,
"Tobias Schlüter" <tobias.schlueter@physik.uni-muenchen.de>,
"Hartmut Penner" <hepenner@us.ibm.com>,
"Paul Clarke" <pc@us.ibm.com>,
"Jerry DeLisle" <jvdelisle@gcc.gnu.org>,
"Tobias Burnus" <tobias@codesourcery.com>,
"Daniel Kraft" <d@domob.eu>, "Paul Thomas" <pault@gcc.gnu.org>,
"Janus Weil" <janus@gcc.gnu.org>,
"Daniel Franke" <franke.daniel@gmail.com>,
"Thomas König" <tkoenig@gcc.gnu.org>,
"Uros Bizjak" <ubizjak@gmail.com>,
"Erik Edelmann" <erik.edelmann@iki.fi>,
"Janne Blomqvist" <jb@gcc.gnu.org>,
"Jakub Jelinek" <jakub@redhat.com>,
"gcc Mailing List" <gcc@gcc.gnu.org>,
"Pedro Franco de Carvalho" <pedromfc@linux.ibm.com>,
"Tulio Magno Quites Machado Filho" <tuliom@linux.ibm.com>,
"Jan Hubicka" <hubicka@ucw.cz>, "Carl Love" <cel@us.ibm.com>,
"Richard Earnshaw" <richard.earnshaw@arm.com>,
"Richard Biener" <rguenther@suse.de>,
"Nathan Sidwell" <nathan@acm.org>,
"Mikael Morin" <mikael@gcc.gnu.org>,
"Carlos O'Donell" <carlos@systemhalted.org>,
"Ramana Radhakrishnan" <ramana.radhakrishnan@arm.com>,
"François-Xavier Coudert" <fxcoudert@gcc.gnu.org>
Subject: Re: First set of patches to allow changing the long double default were posted:
Date: Wed, 7 Oct 2020 20:30:53 -0500 [thread overview]
Message-ID: <20201008013053.GI2672@gate.crashing.org> (raw)
In-Reply-To: <20201008000049.GA12185@ibm-toto.the-meissners.org>
Hi!
On Wed, Oct 07, 2020 at 08:00:49PM -0400, Michael Meissner wrote:
> I looked into this a bit, and I think we want to keep the current behavior (as
> modified by the patches). As Joseph says, the _Float<n> types have their own
> types, but may/may not use the same modes as other types. Obviously if these
> types leak into C++ (i.e. but 85518), then something needs to be done about
> mangling. But that is a machine independent issue, not a PowerPC issue.
There is DF128_ defined for just this, fwiw. (See
<https://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangling-builtin>.)
> I did play around with making _Float128 always use KFmode, but it will cause us
> to need other changes. I can do these changes if needed, but it seems like a
> lot of pointless work.
It would be ideal if we would never have TFmode stuff in the instruction
stream, only IFmode and KFmode. Hey, I can dream :-)
Segher
prev parent reply other threads:[~2020-10-08 1:32 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-07 20:55 Changes to allow PowerPC to change the long double type to use the IEEE 128-bit floating point format Michael Meissner
2020-08-07 21:14 ` PowerPC long double Mangling Michael Meissner
2020-09-09 13:42 ` Jonathan Wakely
2020-09-09 15:36 ` Segher Boessenkool
2020-09-09 17:06 ` Thomas Koenig
2020-09-09 17:32 ` Segher Boessenkool
2020-09-09 17:41 ` Jakub Jelinek
2020-09-09 18:49 ` Segher Boessenkool
2020-09-15 5:37 ` Michael Meissner
2020-09-15 7:09 ` Jakub Jelinek
2020-08-08 13:33 ` Changes to allow PowerPC to change the long double type to use the IEEE 128-bit floating point format Thomas König
2020-08-08 20:17 ` Thomas König
2020-08-10 16:53 ` Michael Meissner
2020-08-15 7:58 ` Thomas König
2020-08-08 13:44 ` H.J. Lu
2020-09-24 21:00 ` First set of patches to allow changing the long double default were posted: Michael Meissner
2020-09-28 16:38 ` Joseph Myers
2020-09-28 21:07 ` Michael Meissner
2020-09-28 21:19 ` Jakub Jelinek
2020-09-28 22:13 ` Joseph Myers
2020-09-29 16:34 ` Jonathan Wakely
2020-09-29 16:53 ` Joseph Myers
2020-10-08 0:00 ` Michael Meissner
2020-10-08 1:30 ` Segher Boessenkool [this message]
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