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Date:	Wed, 1 Aug 2018 13:00:09 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: x86_64: floating-point environment (i.e. fenv.h). BUG.
Message-ID:	<20180801110009.GA30124@calimero.vinschen.de>
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On Aug  1 12:22, Houder wrote:
> Hi Corinna,
>=20
> Short version of my report (as there is more to say about the implementat=
ion
> of
> "fenv") in Cygwin; this time I restrict myself to a bug in fegetenv() ).
>=20
> (Note to myself: attach STC)
>=20
> I am reporting a bug in fegetenv() in winsup/cygwin/fenv.cc. There is no
> hurry
> in repairing this bug, as "fenv" is hardly ever (never?) used by anyone.
>=20
> fegetenv() should be modified as follows:
>=20
> from:
>   __asm__ volatile ("fnstenv %0" : "=3Dm" (envp->_fpu) : );
>   if (use_sse)
>     __asm__ volatile ("stmxcsr %0" : "=3Dm" (envp->_sse_mxcsr) : );
>   return 0
>=20
> to:
> // Henri: copying glibc ...
>   __asm__ volatile ("fnstenv %0\n"
>                     "fldenv %0" : "=3Dm" (envp->_fpu) : );
>   if (use_sse)
>     __asm__ volatile ("stmxcsr %0" : "=3Dm" (envp->_sse_mxcsr) : );
>   return 0;

Since you know how to fix things, please just send patches to
the cygwin-patches ML.


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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