[PATCH] haifa-sched: handle fallthru edge to EXIT block (PR 85899)

[Alexander Monakov]

On Thu, 28 Feb 2019, Alexander Monakov wrote:

> Hi,
> 
> in PR 85899 an assert is failing in find_fallthru_edge_from because the code
> tries to verify the invariant e->dest == e->src->next_bb for a fallthru edge
> and does not anticipate that it will fail if e->dest is the exit block (bb 1):
> in this case next_bb is fairly arbitrary (it's just the next bb that appears
> in the insn sequence and has nothing to do with the "fake" fallthru to exit).

Or is the bug in out-of-cfglayout code creating such bogus fallthru edge?

Thanks.
Alexander