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From: Andreas Schwab <schwab@suse.de>
Subject: Re: [Qemu-devel] Another MIPS quiet NaN fix
References: <20070924133729.GA13307@caradoc.them.org>
Date: Mon, 24 Sep 2007 16:05:45 +0200
In-Reply-To: <20070924133729.GA13307@caradoc.them.org> (Daniel Jacobowitz's
	message of "Mon\, 24 Sep 2007 09\:37\:29 -0400")
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To: qemu-devel@nongnu.org

Daniel Jacobowitz <drow@false.org> writes:

> Glibc's test-float failed on my qemu testing.  I tracked it down to
> these routines: if you count the bits carefully, you'll see that
> 0x7FC00000 sets the quiet NaN bit (on most hardware - signalling NaN
> in the MIPS case); so does a.high >> 41, which copies it from the
> original NaN.  I think this routine should not force a quiet or
> signalling NaN, but just preserve the input NaN's signalling-ness.

You may need to make sure that at least one mantissa bit is set.

Andreas.

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