Re: Functions locality and instruction fetch

[Julio Merino <julio%meroh.net@localhost>]

On Sun, Jan 27, 2013 at 12:14 PM, Sad Clouds
<cryintothebluesky%googlemail.com@localhost> wrote:
> Hello,
>
> I remember some years ago I was playing with Sun Studio compilers on
> Solaris. I don't remember the exact commands/options, but there was a
> way to run your code under a special profiler, which would output
> locality information about various functions into a file. Then you could
> use this file as input to a compiler, which would generate executable
> code, where frequently called functions were placed closer to each
> other. In theory this would improve performance due to locality of
> reference.
>
> I don't think GCC has anything of that kind, so I thought maybe the
> order in which you write functions in source files has similar effects.

Indeed, it seems GCC does not support this. But IIRC, llvm does
support profile-based optimization. You might want to play with that.

-- 
Julio Merino / @jmmv