https://issues.dlang.org/show_bug.cgi?id=23464

deadalnix <deadalnix@gmail.com> changed:

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Referenced Issues:

https://issues.dlang.org/show_bug.cgi?id=21121
[Issue 21121] Optimizer slowdowns
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https://issues.dlang.org/show_bug.cgi?id=23464

Ketmar Dark <ketmar@ketmar.no-ip.org> changed:

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https://issues.dlang.org/show_bug.cgi?id=23464

Adam D. Ruppe <destructionator@gmail.com> changed:

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                 CC|                            |destructionator@gmail.com

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https://issues.dlang.org/show_bug.cgi?id=23464

Dennis <dkorpel@live.nl> changed:

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--- Comment #1 from Dennis <dkorpel@live.nl> ---
There's a lot of things going on.

First of all, you're mixing in 35000 lines full of switch statements into a single function. The backend needs a few seconds to generate code for that, I think it has quadratic slowdown when you have a function with lots of scopes.

You're also using `format!"case '%s':"`, which is pretty complex to do in CTFE as opposed to simple string concatenation.

But by far the most time consuming is instantiating `singleEntity!""` 2000 times in the switch cases. Inside that template you index an enum `HtmlEntities`, which is an associative array literal with 2000 entries. This seems to take 90% of the compilation time.

I suppose the compiler could be smarter about re-using the associative array literal.

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https://issues.dlang.org/show_bug.cgi?id=23464

--- Comment #2 from Dennis <dkorpel@live.nl> ---
Created attachment 1859
  --> https://issues.dlang.org/attachment.cgi?id=1859&action=edit
Self-contained test case

I attached my reduction in expanded form in a single file.

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https://issues.dlang.org/show_bug.cgi?id=23464

Iain Buclaw <ibuclaw@gdcproject.org> changed:

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           Priority|P1                          |P4

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https://issues.dlang.org/show_bug.cgi?id=23464

deadalnix <deadalnix@gmail.com> changed:

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           See Also|                            |https://issues.dlang.org/sh
                   |                            |ow_bug.cgi?id=21121

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