Yes http://blogs.sun.com/jrose/entry/fixnums_in_the_vm describes it exactly! I had thought it was Per Botner.. I must have read both Per's KAWA fixnums and that blog on the same day. Although if my memory serves (which it hasn't), there was someone starting to do this on the JikesRVM.
On Tue, Nov 17, 2009 at 11:55 PM, Charles Oliver Nutter <head...@headius.com> wrote: > On Tue, Nov 17, 2009 at 11:37 AM, <logic...@gmail.com> wrote: >> One old fixnum solution proposed by Per Bothner many years ago >> (he is on this mailing list so he might know the PDF he wrote I am referring >> to?) >> Whenever I read something,my mind often over paraphrases things >> (even makes up it's own version!) but I walked away with this >> >> The primitive types that the JVM feels the need to box. Int/float/byte etc >> >> All could be put into a "TAGGED" structure. This means >> >> (jobject && BYTE_TAG) >> TAG_LSR_BYTE == jbyte value >> (jobject && INT_TAG) >> TAG_LSR_INT == jint value > > Yes, this sounds like a typical "tagged pointer" way of representing > numerics as pseudo-references. John Rose also posted about Fixnums in > the JVM here: > > http://blogs.sun.com/jrose/entry/fixnums_in_the_vm > > As I understand it from talking to John and others, it would not be > particularly "difficult" to get fixnums into the JVM, but there's > nobody working on it at present. We have folks doing dynamic > invocation, interface injection, tail calls, continuations/coroutines > and more...but no fixnums yet. > > - Charlie > > -- > > You received this message because you are subscribed to the Google Groups > "JVM Languages" group. > To post to this group, send email to jvm-langua...@googlegroups.com. > To unsubscribe from this group, send email to > jvm-languages+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/jvm-languages?hl=. > > > -- You received this message because you are subscribed to the Google Groups "JVM Languages" group. To post to this group, send email to jvm-langua...@googlegroups.com. To unsubscribe from this group, send email to jvm-languages+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/jvm-languages?hl=. -- You received this message because you are subscribed to the Google Groups "JVM Languages" group. To post to this group, send email to jvm-langua...@googlegroups.com. To unsubscribe from this group, send email to jvm-languages+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/jvm-languages?hl=.
