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Date: Thu, 5 May 2005 01:21:36 +0200
From: Marc Olzheim <marcolz@stack.nl>
To: Daniel Eischen <deischen@freebsd.org>
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cc: Marc Olzheim <marcolz@stack.nl>
cc: David Schultz <das@freebsd.org>
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Subject: Re: Floating point exceptions with -pthread
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On Wed, May 04, 2005 at 07:07:48PM -0400, Daniel Eischen wrote:
> > Question remains why the truncf() doesn't trigger it and the ceilf() and
> > floorf() does.

I just checked all files in /usr/src/lib/msun/i387/.
The following functions are the only ones using stackspace in the i387
dir, the rest just uses the arguments directly:

ceil*(), floor*(), {,l}lrint*(), trunc*().

Of those, only the ceilf(),floorf() and truncf() used more than %esp was
lowered.

> > And why it only triggers with threads (even a single thread is enough).
>=20
> For the latter, the threads library may place a stackframe on
> top of the swapped-out thread's stack.  Without threads, or
> even with libthr, the thread's stack doesn't get used by
> anything else.

Ah, that explains.

Thanks a lot, Daniel and David, for your help and time today!

Marc

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