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Date:      Wed, 4 May 2005 21:51:53 +0200
From:      Marc Olzheim <marcolz@stack.nl>
To:        Daniel Eischen <deischen@freebsd.org>
Cc:        freebsd-threads@freebsd.org
Subject:   Re: Floating point exceptions with -pthread
Message-ID:  <20050504195153.GC76171@stack.nl>
In-Reply-To: <Pine.GSO.4.43.0505041512050.498-100000@sea.ntplx.net>
References:  <20050504183132.GA76171@stack.nl> <Pine.GSO.4.43.0505041512050.498-100000@sea.ntplx.net>
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On Wed, May 04, 2005 at 03:15:06PM -0400, Daniel Eischen wrote:
> > It seems to me like something about the floorf() assembly might have
> > something to do with it.
>=20
> Yeah, I was just trying to narrow down the problem a bit more.

I've attached one that's built very tight around floorf().

Marc

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all: fpu6 fpu6th

fpu6th:	fpu6.c
	cc -O3 -Wall -W -Werror -Wno-unused -g -Wcast-qual  -DWITH_THR -fstrict-aliasing -pthread fpu6.c -o fpu6th -lm

fpu6:	fpu6.c
	cc -O3 -Wall -W -Werror -Wno-unused -g -Wcast-qual  -fstrict-aliasing fpu6.c -o fpu6 -lm

clean:
	rm -f fpu6 fpu6th fpu6th.core core

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/* Blame it in Marc Olzheim (Zlo) */

#ifdef		WITH_THR
#include	<pthread.h>
#endif		/* WITH_THR */

#include	<err.h>
#include	<math.h>
#include	<stdio.h>
#include	<unistd.h>

void *
calc_thread(void *arg)
{
	float		f;

	for (;;) {
		f = floorf((float)1.0 / (float)((long)arg + 1L));

		if (f > (float)1.0)	/* Never true, but needed to use f. */
			printf("\r%f", (double)f);
	}

	/* NOTREACHED */
	return NULL;
}

int
main(int argc, char *argv[])
{
#ifdef		WITH_THR
	pthread_t	thread;

	if (pthread_create(&thread , NULL, calc_thread, (void *)1L))
		err(1, "pthread_create()");
#else		/* ! WITH_THR */
	(void)calc_thread((void *)1L);
#endif		/* ! WITH_THR */

	for (;;)
		sleep(60);

	/* NOTREACHED */
	return 0;
}

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