Duplicating immediate predecessor of EXIT_BLOCK

[Ian Lance Taylor]

mcrosier@ncsu.edu writes:

> I'm interested in duplicating the immediate predecessor basic block of the
> EXIT_BLOCK, but this makes the EXIT_BLOCK have 2 predecessors which isn't
> allowed.  Can someone give me some guidances as to how I can insert a
> bogus block between the two to allow the duplication?

Why can't EXIT_BLOCK have two predecessors?

Ian