Dan Sugalski wrote: > At 04:29 PM 11/7/2001 -0500, James Mastros wrote: > > On Wed, Nov 07, 2001 at 10:15:07AM -0500, Ken Fox wrote: > > > If Perl can keep the loop index in an integer register, then Parrot > > > could use fast loop ops. IMHO there's no point in using fast loop ops > > > if taking the length of @vector is expensive. > > > > Huha? I don't see what the problem is with keeping the index in an I > > register. The problem is with keeping the _current element_ in an I > > register. > > Yup. Hidden things--loop counters, iterators, stuff like that--can and > probably will use the I registers.
If the interfaces between "hidden things" and PMCs are expensive then I don't see the point in putting those things in non-PMC registers. For example, if a loop index is compared to the length of an array, Parrot is going to have to convert the index to a PMC so it can be compared to the PMC array length. Might as well just use a PMC index to begin with... - Ken
