On Wed, Jan 28, 2009 at 00:06, Chris Lattner <clatt...@apple.com> wrote:
> Thanks for the summary, it's great to see the progress of the project. Do > you have any compile time numbers for LTO so far? If you pick a mid-sided > program from spec or even a bootstrap, how much slower is LTO than compiling > at -O3? The compiler still cannot bootstrap itself with LTO enabled (at least not as of 2-3 months ago) and while we haven't been doing any serious timings. The SPEC2000 builds I've done with LTO enabled show slowdowns between 2x and 3x (the compiler generates code twice, once during cc1/cc1plus and the second time during lto1). I have no idea how this fares in SPEC2k6. In terms of scores, they are annoyingly flat. Still haven't analyzed why. Diego.
