Re: flags in a bitmap

[Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>]

On Fri, Jul 04, 2025 at 12:38:59PM +0200, Ruud H.G. van Tol wrote:
> > ? install(bitset,vWL)
> > ? x=2^(2^20);
> > ? forprime(p=2,2^20,bitset(~x,p))
> >   ***   last result computed in 8 ms.
> > ? my(S=0);for(i=0,2^20-1,S+=bittest(x,i));S
> > %16 = 82025
> >   ***   last result computed in 159 ms.
> 
> That indeed looks good, and I can test it.

Great, I have made a GIT branch bill-bitset

commit 8632eaf7528554234aaa90d9a503476452cbd736 (HEAD -> bill-bitset, origin/bill-bitset, master)
Author: Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>
Date:   Thu Jul 3 23:57:00 2025 +0200

    New GP functions bitset, bitclear

Cheers,
Bill