gcc/resource.c mark_target_live_regs Question

[Richard Kenner]

    If it is completely "scrogg"ed, why can
    gcc/resource.c:mark_target_live_regs(), line 961, use the live
    register information?  Is live register information for blocks
    beginning immediately after barriers preserved while other live
    register information is unreliable?

That's what used to be the case because of reload.  It would be surprising
(but perhaps true) if the exact same situation is true with the changes that
reorg itself does.