Re: Comparison of GCC-4.6.1 and LLVM-2.9 on x86/x86-64 targets

[Duncan Sands <baldrick at free dot fr>]

Hi Vladimir, thanks for doing this.

> The above said about compilation speed is true when GCC front-end is
> used for LLVM.

It's not clear to me which GCC front-end you mean.  There is llvm-gcc
(based on gcc-4.2) and the dragonegg plugin (the 2.9 version works with
gcc-4.5; the development version works also with gcc-4.6).  Can you
please clarify.  By the way, some highly unscientific experiments I did
suggest that the GCC tree optimizers are (almost) as fast as the LLVM IR
optimizers while doing a better job; while at -O3 the LLVM code generators
are significantly faster than the GCC code generators and do a comparable
and sometimes better job.  Unfortunately I haven't had time to do a serious
study, so this might just be an accident of the benchmarks I looked at and
the options I happened to use rather than anything meaningful.

Ciao, Duncan.