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Re: [Qemu-trivial] [PATCH] softfloat: fix mask in extractFloat32Exp


From: Alexander Aring
Subject: Re: [Qemu-trivial] [PATCH] softfloat: fix mask in extractFloat32Exp
Date: Fri, 5 Apr 2013 20:26:18 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

Hi,

On Fri, Apr 05, 2013 at 02:52:23PM +0200, Stefan Hajnoczi wrote:
> 
> This patch seems wrong because the fraction is 23 bits, exponent is 8
> bits, and sign is 1 bit.
> 
> IEEE 754 Binary32 representation:
> SEEEEEEEEFFFFFFFFFFFFFFFFFFFFFFF
>  3      2                      0
>  0      3
> 
> http://en.wikipedia.org/wiki/Binary32
> 
> Since the exponent is *8* bits, 0xFF is correct.  The sign bit is 0x100
> after >>23.
>

ahh, I see it! Sorry for the noise :)

Alex



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