On May 23, 2007, at 6:33 AM, Dan Muresan wrote:
The SRFI-60 egg, per the SRFI document, exports bitwise-* & and
arithmetic-shift, which override the definitions in the library
unit. It probably should at least rename them before the override.
I will do this & release an update SRFI-60. (Personally I don't
think the aliases are a good idea but that is the SRFI.)
The strictest interpretation of the aliasing requirement that I can
concieve of is that
(eq? bitwise-ior logior)
returns true. I don't think the SRFI mandates the reference
implementation to be used. Therefore, you could simply alias logior
to mean bitwise-ior etc.
This would solve the bug, right?
Yes. What I did was a Q&D placeholder. W/O a real review of the
semantics of SRFI-60 I didn't feel comfortable w/ the above.
W/ the numbers egg the reference implementation will work w/ bignums.
(Interesting given that GMP uses sign-magnitude & not 2s-complement.)
While the document speaks of fixnums, it uses the term
interchangeably with integer.
Maybe the log* operations could have a broader definition of
'integer' than the bitwise-* operations.
But, it might be best to be true to the spirit of the SRFI. In any
case, the bit fiddling/logic operations on bignums should be done by
GMP so a SRFI-60 extension for the numbers egg is a good idea.
Best Wishes,
Kon
-- Dan
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