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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: Thu, 14 Apr 2011 08:14:11 -0700
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110307 Fedora/3.1.9-0.39.b3pre.fc14 Thunderbird/3.1.9

On 04/14/2011 02:14 AM, Peter Maydell wrote:
> While we're on the subject of Alpha and flush-to-zero modes,
> do you know what exception bits should get set when Alpha
> flushes a denormal output (not input) to zero?
> I think Alpha should set Inexact and not Underflow, but
> I'm not sure -- can you confirm/deny?


Page B-8, Add Sub Output Exceptions,

  Exponent underflow and disabled:
    Supply +0, no exception delivered to user.

  Exponent underflow and enabled:
    Supply +-MIN denorm, Underflow delivered to user.

    Footnote 3, Overflow and Underflow have priority over Inexact.


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