Re: [LAD] Integer performance

On Sat, 2 May 2015 20:53:15 +0000
Fons Adriaensen <fons@email-addr-hidden> wrote:

> On Sat, May 02, 2015 at 08:57:25PM +0100, Will Godfrey wrote:
>
> > > What masking?
> >
> > Presumably bits have to be masked when being set or read to provide the boolean
> > action. I wouldn't expect true single bit direct storage to be available.
>
> No, the compiler will use one of the available int sizes (again
> depending on CPU) and just test for zero/not-zero. It will not
> try to use each bit separately.
>
> For arrays of bool, GCC uses a char for each bool.

Ouch! that could get expensive - although I doubt it will ever be an issue for
me. Certainly worth remembering though.

-- 
Will J Godfrey
http://www.musically.me.uk
Say you have a poem and I have a tune.
Exchange them and we can both have a poem, a tune, and a song.
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