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Date: Sat, 08 Feb 2020 02:52:00 -0000
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
Message-ID: <20200208025155.GW22482@gate.crashing.org>
References: <CAFiYyc3nn4k5QHAMoy26EbLEt2CYVvbfLLtKjqGi6L6PBbL4jA@mail.gmail.com> <20200207164732.24E0DD802A9@oc3748833570.ibm.com>
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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