[Sbcl-devel] make-instance optimizations

[Nikodemus S. <nik...@ra...>]

I've extended SBCL's optimized constructors (the thing that makes
MAKE-INSTANCE fast) to cover more cases.

1. Classes whose slots need (SETF SLOT-VALUE-USING-CLASS) or
SLOT-BOUNDP-USING-CLASS.

2. Classes with INITIALIZE-INSTANCE :AROUND methods.

Basically, now optimized constructors can be used unless
- there is a custom MAKE-INSTANCE method on the metaclass
- there are methods on ALLOCATE-INSTANCE
- there are slots with allocation other than :INSTANCE or :CLASS
- there are non-constant initargs -- that is (make-instance 'foo (some-key) ...)
- there is a non-standard primary method on INITIALIZE-INSTANCE
- there is an :AROUND, or a non-standard primary method on SHARED-INITIALIZE

The patches are at https://github.com/nikodemus/SBCL on the "pending"
branch. Unless horrifying bugs are discovered, I will commit them once
the CVS comes back up.

If you have an application where you used to see MAKE-INSTANCE or
FAST-MAKE-INSTANCE is SB-SPROF output, I would be interested in
hearing how much of a difference this makes for you.

Cheers,

 -- Nikodemus