From: Lucretia <laguest9000@googlemail.com>
Subject: Re: Not good for Ada endorsement
Date: Thu, 15 Jul 2021 08:13:05 -0700 (PDT) [thread overview]
Message-ID: <0e6ee3e9-baad-47b3-872b-90ec6c735920n@googlegroups.com> (raw)
In-Reply-To: <sc94dv$2rq$2@dont-email.me>
On Friday, 9 July 2021 at 10:21:05 UTC+1, Jeffrey R. Carter wrote:
> On 7/9/21 11:16 AM, Jeffrey R. Carter wrote:
> >> if Number mod 2 /= 0 and then Sieve.Bits(Index_Type(Number)) then
> >>
> >> and then incrementing Number by 1.
> >
> > Since both operands are positive, mod and rem give the same results, and rem is
> > usually a bit faster. It's normally not an issue, but in this case it's done
> > billions of times, so it might make a difference.
> Note also that short-circuit forms (and then) require disabling processor-level
> optimizations and may have a negative effect on execution time when used
> unnecessarily.
You don't need those as the algorithm always starts at 3 and increments by 2.
I managed to get just under 4000 passes with a 1 bit array, but not using Ada's packed array. That's actually the slowest method, strangely.
next prev parent reply other threads:[~2021-07-15 15:13 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-07 14:21 Not good for Ada endorsement Richard Iswara
2021-07-07 15:06 ` Luke A. Guest
2021-07-07 15:19 ` Doctor Who
2021-07-07 19:21 ` Simon Wright
2021-07-07 19:49 ` Doctor Who
2021-07-07 20:39 ` Luke A. Guest
2021-07-08 3:46 ` Richard Iswara
2021-07-08 8:20 ` Jeffrey R. Carter
2021-07-08 8:42 ` Dmitry A. Kazakov
2021-07-08 8:52 ` Luke A. Guest
2021-07-08 10:42 ` Jeffrey R. Carter
2021-07-08 10:51 ` Luke A. Guest
2021-07-08 11:12 ` Jeffrey R. Carter
2021-07-08 17:37 ` Luke A. Guest
2021-07-08 17:43 ` Luke A. Guest
2021-07-08 19:16 ` Luke A. Guest
2021-07-08 19:16 ` Luke A. Guest
2021-07-09 2:47 ` Richard Iswara
2021-07-09 8:10 ` Paul Rubin
2021-07-09 8:24 ` Egil H H
2021-07-09 8:33 ` Egil H H
2021-07-09 9:16 ` Jeffrey R. Carter
2021-07-09 9:21 ` Jeffrey R. Carter
2021-07-15 15:13 ` Lucretia [this message]
2021-07-15 15:56 ` Jeffrey R. Carter
2021-07-15 16:29 ` Anh Vo
2021-07-15 17:30 ` Lucretia
2021-07-16 16:27 ` Simon Wright
2021-07-16 16:28 ` Simon Wright
2021-07-23 17:55 ` Luke A. Guest
2021-07-23 17:04 ` Anh Vo
2021-07-23 17:12 ` Luke A. Guest
2021-07-15 16:29 ` Lucretia
2021-07-15 16:49 ` Dmitry A. Kazakov
2021-07-15 21:08 ` Jeffrey R. Carter
2021-07-11 15:54 ` Dennis Lee Bieber
2021-07-18 23:03 ` Mace Ayres
2021-07-19 1:00 ` Paul Rubin
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