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Date: Tue, 20 Nov 2001 20:51:05 +0300
From: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
To: Richard Henderson <rth@redhat.com>
Cc: Jay.Estabrook@compaq.com, linux-kernel@vger.kernel.org
Subject: Re: [alpha] cleanup opDEC workaround
Message-ID: <20011120205105.A15395@jurassic.park.msu.ru>
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In-Reply-To: <20011120090818.A16366@redhat.com>; from rth@redhat.com on Tue, Nov 20, 2001 at 09:08:18AM -0800
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On Tue, Nov 20, 2001 at 09:08:18AM -0800, Richard Henderson wrote:
> Oh, it depended on this one.

Ok, but with opDEC_fix = 8 we actually skip to addt/stt, so that asm
probably should be rearranged to

		"fmov $f31, $f0\n\t"
		"cvttq/svm $f31, $f31\n\t"
		"addt $f31, $f31, $f31\n\t"
		"cmpteq $f31, $f31, $f0\n\t"
		"stt $f0, %0"

Further, if fp emulation isn't compiled in, we'll have kernel mode
instruction fault. A quick fix appears to be

			regs.pc += opDEC_fix;
+			if (opDEC_fix == 8)
+				return;

Did I missed something?

Ivan.
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