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Re: Add machine_dependent_reorg2
Richard Henderson <email@example.com> writes:
> On Sun, Jun 22, 2003 at 03:56:04PM +0100, Richard Sandiford wrote:
> > This patch adds a version of machine_dependent_reorg that runs after
> > delayed-branch scheduling. It's used by a patch I'm about to post.
> I'm not sure what I think about this. I've had other occasion
> to want a md-reorg pass that runs before sched2. And three such
> passes seems excessive, and a clear sign of mis-design.
> The alternative is to hijack dbr, much like ia64 hijacks sched2.
I guess that'd work too. On the other hand, it'd be nice not
to have to write stuff like:
mips_flag_delayed_branch = flag_delayed_branch;
flag_delayed_branch = 0;
How about having a hook that gets run before and after each
main optimisation pass? Something like:
void (*before_pass) (enum dump_file_index);
void (*after_pass) (enum dump_file_index);
The hooks could be called from open_dump_file and close_dump_file.
Then any port that needs to do something before sched2 or dbr
could do it in before_pass(). machine_dependent_reorg could be
moved just before shorten_branches (where reorg2 was going to go).
OK, so it's still three target hooks, but it seems bit less
arbitrary than having mdrs at three particular points.