Björn Steinbrink 41914c5d30 Generate code that is friendlier to rustc's item_bodies_checking ...

Having the Some() constructor in each match arm body puts extras stress
on rustc's item_bodies_checking pass. We can work around that by moving
the Some() constructor around the match, and directly returning None
from the default arm, which is the only one that generates a None value.

On my box, this almost cuts the time spent in item_bodies_checking in
half, going from about 8.7s to about 4.6s, and reduces the complete
compile time from about 13s to about 9s, so about a third less.

There are no changes in performance in `cargo bench`.

Note that doing the same for the composition_table() function does not
yield any compile time wins, but would cause a performance regression.

cc #29

2019-01-08 17:02:41 +01:00

..

unicode.py

Generate code that is friendlier to rustc's item_bodies_checking

2019-01-08 17:02:41 +01:00