Ray Racine wrote: > The answer is correct, however, the 1 sec calculation time is a bit longer > than anticipated along with the 4 million allocated words. I understand why > bitwise manipulations are going to be slower in dynamically typed language > with type tag bits. Thought I'd toss it out in the hopes someone may spot a > low hanging fruit change in my implementation, recommend some compiler > options etc. At a minimum it might make a decent benchmark for grading > (rnrs arithmetic bitwise) implementations.
Thanks. Felix has already pointed you to the workarounds appropriate for the current system. Some of the allocation may come from bignums generated as intermediate values. There is hope for improvement in future releases. Most of the current inefficiency comes from implementing the R6RS semantics without regard for performance. The great primop cleanup began with v0.97 "Funny in the Head", but only a few bitwise operations were improved, and almost all of the improvements applied mainly to bignums, not fixnums. Most of the changes in the next release are likely to consist of minor bug fixes and performance improvements. The bitwise and bytevector operations are among the lowest-hanging fruit for that release. > P.S. Noticed the Larceny SVN and mail list has been a bit quiet. Anything > new and notable coming down on the Larceny front? 64Bit? Native threads? Our main priority right now is Felix's thesis defense and completing transfer of his maintenance responsibilities to me. So far as new releases of Larceny go, integrating his new garbage collector is the first priority. A 64-bit Larceny is essential, but we'll do a 64-bit Petit Larceny first because Sassy doesn't support the 64-bit instructions we need, and coming up with the 64-bit runtime will be easier if we don't have to change the compiler and assembler at the same time. I think 64 bits is a higher priority than native threads. _______________________________________________ Larceny-users mailing list Larceny-users@lists.ccs.neu.edu https://lists.ccs.neu.edu/bin/listinfo/larceny-users
