Viewing profile — slava_pestov

> I want to write Lisp for Factor. That would be a cool project. The Factor compiler enforces static stack effects for words, so mapping them to Lisp functions, and making the gene…

Each one is true for at least one of those platforms.

I should say, Unix in this context means any Unix-like system that Factor runs on (Linux, FreeBSD, OpenBSD, Mac OS X)

I don't see what the big deal is. It took me a few hours to update Factor's Twitter library for OAuth -- and that included writing the OAuth support library. The whole thing is onl…

Factor uses ahead of time compilation. When you load a source file at the REPL, all definitions in it are compiled immediately, and compiled code is saved in the image. So when you…

Under what circumstances does Visual C++ still emit x87 instructions? I'd think that other than legacy support, 80-bit long double arithmetic, and the 32-bit ABI (float return valu…

Unfortunately enough people have older CPUs that we still have to support x87 code generation; its just not used in the binary packages, you have to build the source to get it.

Factor supports machines without SSE2 if you compile it yourself. In this case it will use the x87 floating point. The binaries are built to use SSE2 for floating point since most …

The JRuby developers have spent a lot of time doing performance measurements, implementing optimizations and trying out different approaches. You're just throwing in your two cents…

> Does this mean that simple accessors (or at least getters) effectively have no method call overhead? Method inlining has nothing to do with escape analysis (other than enabling i…

Actually, once you've figured out that you can stack allocate an object, you can stick its instance variables in registers. This can be a huge win.

There's no theoretical difficulty with compiling tail calls to virtual methods; of course perhaps you meant that the JVM doesn't expose a bytecode for doing so, which is absolutely…

tl;dr: No, it has to be built-in to the JVM. First of all, if a JVM were to attempt this optimization for tail calls using the ordinary method call bytecodes, it would break existi…

http://en.wikipedia.org/wiki/Intel_80186

So how does Ruby's performance on vector code compare with OpenCL?

Here's a point-free version in Factor. It looks a bit different from the original formula but once you get used to it its very quick to read; I prefer it to the Lisp code since the…