From: Segher Boessenkool <segher@kernel.crashing.org>
To: Ulrich Weigand <uweigand@de.ibm.com>
Cc: Richard Biener <richard.guenther@gmail.com>,
GCC Patches <gcc-patches@gcc.gnu.org>,
"Joseph S. Myers" <joseph@codesourcery.com>
Subject: Re: [PATCH] Fix -ffast-math flags handling inconsistencies
Date: Sat, 08 Feb 2020 02:52:00 -0000 [thread overview]
Message-ID: <20200208025155.GW22482@gate.crashing.org> (raw)
In-Reply-To: <20200207164732.24E0DD802A9@oc3748833570.ibm.com>
On Fri, Feb 07, 2020 at 05:47:32PM +0100, Ulrich Weigand wrote:
> > but what happens to -fsignalling-nans -ffast-math then? Better leave those
> > in I'd say.
>
> Ah, it seems I was confused about the intended semantics here.
>
> I thought that a *more specific* option like -fsignalling-nans was always
> intended to override a more generic option like -ffast-math, no matter
> whether it comes before or after it on the command line.
-fsignaling-nans is an independent option. Signaling NaNs don't do much
at all when you also have -ffinite-math-only, of course, which says you
don't have *any* NaNs.
Segher
next prev parent reply other threads:[~2020-02-08 2:52 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-31 17:47 Ulrich Weigand
2020-02-05 9:58 ` Richard Biener
2020-02-07 16:47 ` Ulrich Weigand
2020-02-07 22:55 ` Joseph Myers
2020-02-10 16:24 ` Ulrich Weigand
2020-02-10 23:07 ` Joseph Myers
2020-02-11 12:47 ` Ulrich Weigand
2020-02-08 2:52 ` Segher Boessenkool [this message]
2020-02-10 16:27 ` Ulrich Weigand
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