1's comp

Jon Elson elson at pico-systems.com
Sat May 21 21:56:48 CDT 2016

On 05/21/2016 09:34 PM, Toby Thain wrote:
> On 2016-05-21 10:26 PM, ben wrote:
>> On 5/20/2016 7:19 PM, Sean Conner wrote:
>>>> Hehe, what is a long long? Yes, you are totally right. 
>>>> Still, I assert
>>>> that C is still the defacto most portable language on 
>>>> Earth. What other
>>>> language runs on as many OS's and CPUs ? None that I 
>>>> can think of.
>>>   A long long is at least 64-bits long.
>> Only if you get rid of char pointers you are portable.
>> I like 1's compilent because it handles shifting properly.
>> using 1's compilment unsigned would be 1 bit less in size
>> not 1 bit more the C standard seems to make it.
> Don't underestimate the headache of handling two zeroes.
Right, on the LINC, if you compared positive zero to 
negative zero, it would not set the equals flag!
I have no idea how many tests had to be put in the code for 
that, but anyplace where the two values could be zero, you 
had to check for that special case.


More information about the cctalk mailing list