Re: [Sbcl-devel] Some unusual performance issues

[Stas B. <sta...@gm...>]

Bill Hart <goo...@go...> writes:

> When I remove (safety 0) or replace it with any other safety level, it
> is no longer fast. Presumably it spends all its time checking the
> types and for overflows.
Safety 0 may be fast, but it also may be silently incorrect.

> Besides, the functionality I actually want here is addition and
> subtraction modulo 2^64. I am trying to simulate machine words! I
> probably should have explained that in my original post.
Then why do you have LDB (byte 64 0) only if the first argument is 64 bit?

> Perhaps I am missing something, but I haven't been able to see how to
> get the functionality/performance I am after without (safety 0).

-- 
With Best Regards, Stas.