From: "Ulrich Weigand" <uweigand@de.ibm.com>
To: brobecker@adacore.com (Joel Brobecker)
Cc: gdb-patches@sourceware.org
Subject: Re: [RFC][08/19] Target FP: Use target format throughout expression parsing
Date: Mon, 09 Oct 2017 16:59:00 -0000 [thread overview]
Message-ID: <20171009165917.A18F3D83320@oc3748833570.ibm.com> (raw)
In-Reply-To: <20171009160656.vpsnyisfst5pq4f7@adacore.com> from "Joel Brobecker" at Oct 09, 2017 12:06:56 PM
Joel Brobecker wrote:
> > - Ada: This used to check sizeof (DOUBLEST) to determine which
> > type to use for floating-point literal. This seems questionable
> > to being with (since DOUBLEST is quite unrelated to target formats),
> > and in any case we need to get rid of DOUBLEST. I'm now simply
> > always using the largest type (builtin_long_double) -- if there's
> > a better way (not sure what the Ada standard defines here), this
> > can be updated.
>
> I did a bit of archeology, and it looks like this was BMT (Before My
> Time). But looking at the code, I *think* this may have been related
> to the fact that we decode the value and store it in host-side format,
> and it looks like the code is trying to find the best target-side type
> match so as to avoid having to deal with too much precision if the host
> isn't capable of it in the first place??? As you say, this might be
> questionable, just trying to think the reasons behind it.
>
> In any case, I looked at your changes, and they seem fine to me.
> In fact, I welcome the simplification ;-).
Excellent, thanks for the verification!
Bye,
Ulrich
--
Dr. Ulrich Weigand
GNU/Linux compilers and toolchain
Ulrich.Weigand@de.ibm.com
next prev parent reply other threads:[~2017-10-09 16:59 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-05 18:21 Ulrich Weigand
2017-10-09 16:07 ` Joel Brobecker
2017-10-09 16:59 ` Ulrich Weigand [this message]
2017-10-09 18:12 ` Joel Brobecker
2017-10-09 21:14 ` Simon Marchi
2017-10-25 13:35 ` [pushed] " Ulrich Weigand
2017-11-03 12:33 ` Yao Qi
2017-11-03 13:45 ` Ulrich Weigand
2017-11-03 15:00 ` Yao Qi
2017-11-03 15:11 ` Ulrich Weigand
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