On Fri, Apr 15, 2005 at 02:38:36PM +0200, Leopold Toetsch wrote:
: I'm not quite sure, but it seems that some of the MMD functions may
: better be vtable methods:
:
: - bitwise_sh[rl]* shift by anything other then int?
: - bitwise_lsr is missing generally
:
: or even just a plain opcode only:
:
: - logical_{or,and,xor} return a PMC depending on the boolean value
:
: What are HLLs expecting of these infix operations?
Perl 6 tends to distinguish these as different operators, though Perl 5
did overload the bitwise ops on both strings and numbers, which newbies
found confusing in ambiguous cases, which is why we changed it.
: OTOH it might be useful that the current get_<type>_keyed operations
: (postcircumfix:[]) become MMD subroutines:
:
: Px = Py[Pz] Pz = String, Int, Key, Slice, ...
At the moment, the Perl 6 optimizer is explicitly allowed to optimize
array indices with the assumption that the subscript is a scalar
(or slice) of integer, or something that converts to integer. I'd be
interested to know if that policy will actually buy us any performance.
If it always has to go through MMD anyway, maybe it doesn't. But
array indexing code tends to be pretty hot, so if we can keep it
somewhat optimizable and/or jittable, that'd be nice.
Larry
