make-<some-struct> performance

       Hello,

I have a question regarding the performance of structure making
functions. Suppose I have something simple like this:

(defstruct struct (slot1 1 :type fixnum))

Benchmarking a number of calls to make-struct made me realize that there
is no difference between an optimized version:

(declaim (optimize (speed 3)
		   (compilation-speed 0)
		   (safety 0)
		   (debug 0)))

and a safe version:

(declaim (optimize (speed 0)
		   (compilation-speed 0)
		   (safety 3)
		   (debug 0)))


This is quite different from other implementations I'm testing. I have
also noted that there doesn't seem to be any type checking done in the
safe version, so for instance:

(defstruct struct (slot1 1.5 :type fixnum))
(make-struct)

does not trigger a type error. This is also different from other
implementations (and maybe could explain why the safe and optimized
versions perform at the same level; because they wouldn't actually be
different).



Any comment on this ?

Thanks.

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