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Date: Wed, 19 Jul 2006 11:18:51 GMT
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Date: 2006-07-19T11:18:51+00:00
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Shmuel (Seymour J.) Metz wrote:
> In <20060717.7A4ADD0.10B1A@mojaveg.lsan.sisna.com>, on 07/17/2006
>    at 06:26 PM, mojaveg@mojaveg.lsan.sisna.com (Everett M. Greene)
> said:
> 
>>A properly designed 1s complement machine would not
>>generate -0 in normal arithmetic operations.
> 
> 
> 0+(-0)?
> 
> 
>>Thus, no need to perform a program check for -0.
> 
> 
> I never saw a need to test for it regardless. Every 1s complement
> machine I know of lets you test for zero in a single instruction.
> 

What happens on a test for negative?  Did the machines just test the 
sign bit, making -0 a negative number?