On Oct 15, 2012, at 5:41 PM, Jim - FooBar(); wrote: > On 15/10/12 22:44, Alan Malloy wrote: >> >> You add the numbers at compile time, and then time how long it takes >> to...do nothing to them, at runtime. You are comparing N to zero, not >> to some smaller factor of N. >> > > yes but this seems almost unbelievable...i mean for simple numeric operations > this little trick could provide a tremendous speedup. How come this has not > been 'advertised' enough? It is my understanding that not even Java could go > that fast simply because you cannot tap into the compilation process...is > there code that uses this sort of thing for performance? I'd love to take a > peek... > > Jim
Most of the time you aren't adding up 10000 values known at compile time. More often you are doing arithmetic on values you do not yet know until run time. This trick won't help you in that case. For the case of arithmetic on compile-time constants, I believe that many C, Java, etc. compilers already perform the arithmetic at compile time. Andy -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
