Fix PR 53743 and other -freorder-blocks-and-partition failures

[Steven Bosscher]

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
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