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Have you seen this page?Have you seen this page?Posted May 26, 2011 8:27 UTC (Thu) by marcH (subscriber, #57642)In reply to: Have you seen this page? by iabervon Parent article: What Every C Programmer Should Know About Undefined Behavior #3/3
> Those libraries compute the well-defined results of calculations with large numbers; they don't give the result of signed overflow.
Of course they can do this; the latter is just one modulus operation away from the former.
> because that's a matter of processor architecture, not mathematics.
Surprise: processors architectures are rooted in arithmetics. All of them, even though they differ with each other.
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Have you seen this page? Posted May 27, 2011 9:45 UTC (Fri) by dgm (subscriber, #49227) [Link]
> Surprise: processors architectures are rooted in arithmetics. All of them, even though they differ with each other.
Still not a matter of mathematics: both 1's and 2's compliment are equally correct. The matter is about the choice made by the processor designers, and thus, a matter of processor architecture.
Have you seen this page? Posted May 27, 2011 14:03 UTC (Fri) by marcH (subscriber, #57642) [Link]
It's a matter of both: 1. Choose the architecture, 2. Apply the maths specific to this architecture.
GMP or else can help for the latter (of course not for the former).
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