<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> <title></title> </head> <body bgcolor="#ffffff" text="#000000"> Matthew Flatt wrote at 04/24/2011 07:58 PM: <blockquote cite="mid:20110424235816.38D3C6500A0@mail-svr1.cs.utah.edu" type="cite"> <pre wrap="">At Sun, 24 Apr 2011 19:24:18 -0400, Neil Van Dyke wrote: </pre> <blockquote type="cite"> <pre wrap="">The modest performance hit for "assq" on 32-bit (my workstation) right now is a small price to pay for doubling the speed on 64-bit (lots of servers). </pre> </blockquote> <pre wrap=""> I forgot to reply to that point before. Unfortunately, I don't think you're going to see the same effect on other machines.</pre> </blockquote> Oh, you did say something about influence of a particular 64-bit compiler earlier, but in all my excitement, I didn't make the connection. If, at the time this new "assq" makes it into a Racket release, the new "assq" turns out to be significantly slower than the old C one, can the old one ("kernel:assq"?) be exposed for programs to call directly? A performance regression in "assq" would adversely impact some performance-sensitive legacy code that saw a lot of micro-optimizing last year.  Having the old "assq" available as a fallback option would be reassuring. BTW, I do like the idea of "assq" being pure Racket code, where it's more amenable to ongoing work on optimizers, and I don't mean to sound critical of this process. <div class="moz-signature">-- <a class="moz-txt-link-freetext" href="http://www.neilvandyke.org/">http://www.neilvandyke.org/</a> </div> </body> </html>