Re: [PATCH nft 1/2] segtree: Fix range_mask_len() for subnet ranges exceeding unsigned int

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On Thu, May 06, 2021 at 12:00:21PM +0200, Stefano Brivio wrote:
> On Thu, 6 May 2021 11:18:14 +0200
> Phil Sutter <phil@xxxxxx> wrote:
> 
> > On Thu, May 06, 2021 at 12:23:13AM +0200, Stefano Brivio wrote:
[...]
> > > diff --git a/src/segtree.c b/src/segtree.c
> > > index ad199355532e..353a0053ebc0 100644
> > > --- a/src/segtree.c
> > > +++ b/src/segtree.c
> > > @@ -838,8 +838,8 @@ static int range_mask_len(const mpz_t start, const mpz_t end, unsigned int len)
> > >  	mpz_t tmp_start, tmp_end;
> > >  	int ret;
> > >  
> > > -	mpz_init_set_ui(tmp_start, mpz_get_ui(start));
> > > -	mpz_init_set_ui(tmp_end, mpz_get_ui(end));
> > > +	mpz_init_set(tmp_start, start);
> > > +	mpz_init_set(tmp_end, end);  
> > 
> > The old code is a bit funny, was there a specific reason why you
> > exported the values into a C variable intermediately?
> 
> Laziness, ultimately: I didn't remember the name of gmp_printf(),
> didn't look it up, and used a fprintf() instead to check 'start' and
> 'end'... and then whoops, I left the mpz_get_ui() calls there.

OK, so this patch not just fixes a bug but also streamlines the code for
performance (and something with refactoring, too). ;)

Cheers, Phil



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