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Re: ✘nmea.lasttag


From: Gary E. Miller
Subject: Re: ✘nmea.lasttag
Date: Tue, 7 Apr 2020 18:03:14 -0700

Yo Fred!

On Tue, 7 Apr 2020 17:20:42 -0700 (PDT)
Fred Wright <address@hidden> wrote:

> > Closer to 64 byes more, but whose counting?  And clearing a 72 byte
> > array is more work than zeroing an integer.  
> 
> It's not that hard to make it an array of bits.  And clearing it is
> just a matter of memset().  If there's any need to test multiple bits
> at once, then basing it on 32-bit elements instead of 8-bit elements
> would make it a bit faster, without complicating anything else.

Yes, not hard, but I hate to take a 100x performance hit testing all the
elements, instead of bit testing one integer.

Turns out, only one bit was ever set, So all that needs to be done is
save the bit index, not 71 zeros and 1 one.  That should be quick to do.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can't measure it, you can't improve it." - Lord Kelvin

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