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Re: [Qemu-devel] [PATCH 08/19] target-alpha: use new float64_unordered()

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH 08/19] target-alpha: use new float64_unordered() function
Date: Wed, 13 Apr 2011 08:38:26 -0700
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[ Odd, the original thread doesn't seem to have arrived here. ]

On 04/13/2011 07:52 AM, Peter Maydell wrote:
> So I think you want the _quiet version here. (And helper_cmpteq
> needs to use float64_eq_quiet rather than float64_eq.)

Yes, the _quiet version is what's needed for all comparisons.

For the record, the goal for QEMU should not be to emulate the
hardware exactly, but to emulate the entire HW+OS system.  Thus
when looking at Table B-2 one should look at the OS Completion
Handler and User Signal Handler columns.

That's for /s qualified instructions anyway.  For non-ieee code
we take care to inject the extra traps via helper_ieee_input*.

(It looks like some of the Alpha code can be cleaned up a bit.
I don't recall flush_inputs_to_zero option being there before,
and we do that by hand in helper_ieee_input*.)


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