On Thu, May 23, 2013 at 4:07 AM, Jeff Law wrote: > On 05/22/2013 04:07 PM, Steven Bosscher wrote: >> >> >> The problem here is two things: >> >> 1. Many GCC developers still don't fully grasp the difference between >> cfglayout mode and the older cfgrtl mode. > > Absolutely true. I'd actually love it if someone (you?) could write up the > basics of cfglayout mode. Why does it exist, what things should a developer > need to know about it, etc.
I did that already, way back in 2006, based on a presentation I gave at the Moscow Gelato meeting (see attachment). I first posted it as a patch for doc/cfg.texi (twice) but it never got reviewed, so I put it on the GCC Wiki instead: http://gcc.gnu.org/wiki/cfglayout_mode The change-over to MoinMoin mangled the page markup so it's a bit messy right now. It's also 7 year old text that hasn't been updated to reflect the current state of the compiler (with almost all pre register allocator passes working in cfglayout mode). I will clean it up again and create a new diff for cfg.texi. Ciao! Steven
Gelato_Moscow_GCC_meeting_stevenb.odp.gz
Description: GNU Zip compressed data
