>
> On Fri, Mar 9, 2018 at 8:38 PM, Waldek Hebisch <hebi...@math.uni.wroc.pl>
> wrote:
> >>
> >> Waldek, your changes to fix this problem (SVN r2373 or git 6404dd01)
> >> has made SBCL-1.4.5 to use 'make-array' instead of
> >> 'sbcl_make_sized_vector', is that your intention?
> >
> > Yes. We use 'sbcl_make_sized_vector' because it was much faster.
> > But with new sbcl the claim is that 'make-array' is much
> > faster than it was.
> >
>
> For small vector, 'sbcl_make_sized_vector' is faster than 'make-array'
> in sbcl 1.4.5, it's 20% for vector with 10 elements.
We can tolerate 20%.
> It is a bug to have "`(ceiling (* ,n ,n-bits) sb-vm:n-word-bits)"
> in 'sbcl_make_sized_vector', we should fix it to
> "`(ceiling (* ,n ,nb) sb-vm:n-word-bits)".
>
> Also I think it is better to use ALLOCATE-VECTOR-WITH-WIDETAG
> than ALLOCATE-VECTOR.
We try to do the same thing 'make-array' would do, but skipping
time-consuming irrelevant stuff. 'sbcl' used to to do
'ALLOCATE-VECTOR' so we do so.
--
Waldek Hebisch
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