[PATCH] Fix PR 53743 and other -freorder-blocks-and-partition failures (issue6823047)

[Steven Bosscher]

On Thu, Nov 1, 2012 at 10:26 PM, Teresa Johnson wrote:
> I'll do some testing of the fix below, but do you have any comments on
> the correctness or the potential issue I raised (see my note just
> below the patch)?

Sorry, I don't know the pro- and epilogue threading code well enough
to be of any help to you...

> Do you recommend pursuing the move of the bb partition phase until
> later, after we leave cfglayout mode? I need to revisit to see if my
> prologue/epilogue fix below also addresses the issue I saw when I
> tried moving it.

I think it should not be moved, cfglayout mode is the natural mode for
this kind of CFG transformations. But someone will have to tackle the
force_nonfallthru issue.

Ciao!
Steven