From: "M. Edward (Ed) Borasky" <znmeb@...>
Date: 2007-09-24T14:21:34+09:00
Subject: Re: How fast does your Ruby run?

Felix Windt wrote:
> Vanilla Ubuntu, which is still tracking the 4.1 branch:
> 
> ~$ gcc -v
> Using built-in specs.
> Target: i486-linux-gnu
> Configured with: ../src/configure -v
> --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr
> --enable-shared --with-system-zlib --libexecdir=/usr/lib
> --without-included-gettext --enable-threads=posix --enable-nls
> --program-suffix=-4.1 --enable-__cxa_atexit --enable-clocale=gnu
> --enable-libstdcxx-debug --enable-mpfr --enable-checking=release
> i486-linux-gnu
> Thread model: posix
> gcc version 4.1.2 (Ubuntu 4.1.2-0ubuntu4)
> 
> I'm curious whether 4.2 would give further performance enhancements - maybe
> if I have some time this week I'll build a tool chain to test with.
> 
> Felix

It's unlikely to be faster in a statistically significant sense. As a
matter of fact, in many cases the *older* gcc versions give faster code!
Poke around on Anton Ertl's Forth/VMgen site and you'll find that *his*
performance hit a peak with gcc 2.95 and has been dropping steadily with
each new gcc since then. :)