bug#40407: [PATCH] slow ENCODE_FILE and DECODE_FILE

[Mattias Engdegård]

4 apr. 2020 kl. 12.26 skrev Eli Zaretskii <eliz@gnu.org>:

> After looking at this for some time, I think the problem is rarely if
> ever seen.  The only function which has the NOCOPY sense inverted is
> code_convert_string, and it only does that when the CODING_SYSTEM
> argument is nil, which should almost never happen.

Oh, that's the easy part. It's the ASCII optimisation that makes it interesting.