From: Szabolcs Nagy <nsz@port70.net>
To: musl@lists.openwall.com
Cc: David Edelsohn <dje.gcc@gmail.com>
Subject: Re: Re: musl libc for PPC64
Date: Tue, 9 Feb 2016 00:48:31 +0100 [thread overview]
Message-ID: <20160208234831.GI9915@port70.net> (raw)
In-Reply-To: <20160208232945.GE9349@brightrain.aerifal.cx>
* Rich Felker <dalias@libc.org> [2016-02-08 18:29:45 -0500]:
> On Mon, Feb 08, 2016 at 06:24:27PM -0500, David Edelsohn wrote:
> > I'm not sure what you mean. The software emulation assumes the
> > hardware support is not present. It doesn't mirror back the state to
> > the processor in 64 bit mode. But the emulation is fully IEEE128
> > compliant.
>
> if fesetround(FE_DOWNWARD) succeeds but then long double math still
> rounds to nearest, that's not IEEE compliant.
>
> The big obstacle to having fenv with softfloat on fully-softfloat
> archs is the lack of register state for the rounding mode and
> exception flags, so it should be possible to do this right as long as
> the cpu has status/mode registers for single/double, which the
> soft-quad code can then access/set. If this isn't done right already
> we could either try to get it fixed in libgcc or punt and go with
> ld64.
>
it seems to be supported
https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libgcc/config/rs6000/sfp-machine.h;h=75d5e1a2d522e0a3d3c5b0463fcfe9b054f7c263;hb=HEAD#l107
so we can implement iso c annex f with 128 bit long doubles.
next prev parent reply other threads:[~2016-02-08 23:48 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-08 14:43 David Edelsohn
2016-02-08 16:17 ` Szabolcs Nagy
2016-02-08 16:51 ` Rich Felker
2016-02-08 17:48 ` David Edelsohn
2016-02-08 20:18 ` Rich Felker
2016-02-08 20:30 ` David Edelsohn
2016-02-08 22:59 ` Rich Felker
2016-02-08 23:24 ` David Edelsohn
2016-02-08 23:29 ` Rich Felker
2016-02-08 23:48 ` Szabolcs Nagy [this message]
2016-02-09 1:03 ` Szabolcs Nagy
2016-02-09 1:16 ` David Edelsohn
2016-02-09 1:42 ` Szabolcs Nagy
2016-02-09 1:45 ` Szabolcs Nagy
2016-02-09 1:52 ` Rich Felker
2016-02-09 2:06 ` David Edelsohn
2016-02-10 22:17 ` David Edelsohn
2016-02-08 23:52 ` David Edelsohn
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