Issue 13427 - [REG2.066] cannot inline default argument alloca(...)

[yebblies]

Apart from inlining, inlineCost is also used for default argument copying. When using it from there, don't block inlining of alloca.

https://issues.dlang.org/show_bug.cgi?id=13427

[mleise]

Thank you, yebblies! I will give it a try.

[mleise]

The regression is fixed and the function in question also gets inlined correctly so long it doesn't use alloca() internally. LGTM.
By the way: Does this bug mean that DMD generally counts default parameter expressions towards the inlining cost although they will end up on the caller side either way or was alloca() just a special case?

[yebblies]

DMD uses the inliner to copy default arguments into the caller's scope, which makes sure any contained declarations get updated correctly to prevent conflicts. It's done in a different invocation to the actual inlining of the function, so it won't affect inline-ability of the call.

[WalterBright]

Auto-merge toggled on

[yebblies]

Thanks!