RE: [Linux-ia64] avoiding float underflow software assist

["Saxena, Sunil" <sunil.saxena@intel.com>]

Hi Pete,
I have copied Marius who should be able to help answer your question.
Thanks
Sunil

-----Original Message-----
From: Pete Wyckoff [mailto:pw@osc.edu]
Sent: Monday, October 09, 2000 8:12 AM
To: linux-ia64@linuxia64.org
Subject: [Linux-ia64] avoiding float underflow software assist


This little code snippet causes floating-point underflow during the
multiplication.

        float f, g;
	f = 1.3e-23;
	g = f * f;

The kernel handler catches the fault and fixes it up, but that's quite
slow.

Is there a way to have the hardware automatically ignore this condition
and force the result to zero on its own?

I've tried playing with fesetround() and fesetenv() to see if I could
manage it, to no avail.

kernel 2.4.0-test9
Turbolinux 000828 distro
B0 stepping hw

Thanks,
		-- Pete

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