On Sunday, 11 December 2016 at 16:26:29 UTC, Ethan Watson wrote:
At the very least, I now have an idea of which parts of the
compiler I'm taxing and can attempt to write around that. But
I'm also tempted to go in and optimise those parts of the
compiler.
Have a look at this issue:
https://issues.dlang.org/show_bug.cgi?id=16513
In a nutshell:
Dmd puts template instances in an AA using a terrible hash
function.
When looking for a match it does an expensive comparison for each
collision.
The hash function is easily fixed but it does not obviate the
expensive comparison, so it trades hashing time for comparison
time. Therefore the performance impact of fixing it is unclear.
Martin Nowak is suggesting that using the mangled name is the way
forward.
