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[PATCH, SMS] Fix marking of SMSed loops as BB_DISABLE_SCHEDULE


Hello,

The attach patch fixes the current marking of SMS loops to prevent
further scheduling as follows: it marks *all* the loop's bbs with
BB_DISABLE_SCHEDULE which prevents them from been scheduled later.
(with the current implementation if the loop has non empty latch then
it will be considered for scheduling based on
sched_is_disabled_for_current_region_p () in in sched-rgn.c).
It also marks the epilogue and prologue as BB_DISABLE_SCHEDULE which
was shown in my experiments as a good influence on performance as
scheduling those regions after SMS increased register pressure in some
cases.

Tested and bootstrap on all languages except java (PR50879) on
ppc64-redhat-linux, enabling SMS on loops with SC 1.

OK for mainline?

Thanks,
Revital


Changelog:

        * modulo-sched.c (generate_prolog_epilog): Mark prolog and epilog
        as BB_DISABLE_SCHEDULE.
        (mark_loop_unsched): New function.
        (sms_schedule): Call it.

Attachment: patch_unsched.txt
Description: Text document


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