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[Python-Dev] "Micro-optimisations can speed up CPython"

Glenn Linderman v+python at g.nevcal.com
Tue May 30 21:30:56 EDT 2017 
On 5/30/2017 2:18 PM, Guido van Rossum wrote:
> On Tue, May 30, 2017 at 11:49 AM, David Wilson <dw+python-dev at hmmz.org 
> <mailto:dw+python-dev at hmmz.org>> wrote:
>
>     On Tue, May 30, 2017 at 09:38:55PM +0300, Serhiy Storchaka wrote:
>
>     > > In early ages of C structures didn't create namespaces, and member
>     > > names were globals.
>
>     > >That's nonsense. The reason is greppability.
>
>     > Good reason!
>
>     The first time I heard about prefixing struct members was to allow
>     tricks like this:
>
>         x86_64-linux-gnu/bits/stat.h
>         94:# define st_atime st_atim.tv_sec     /* Backward
>     compatibility.  */
>         95:# define st_mtime st_mtim.tv_sec
>         96:# define st_ctime st_ctim.tv_sec
>
>     Which is relatively safe thanks to the prefix.
>
>
> Believe me that is not why the prefix convention was introduced.

Sure, but grepping was not the reason either. Serhiy had the right 
explanation.
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