PATCH to remove unnecessary NOTE_INSN_DELETED

Richard Kenner kenner@vlsi1.ultra.nyu.edu
Wed Nov 3 18:16:00 GMT 1999


    BTW, it's also possible to do regno squashing; those tend to be sparse too.

Yes, but there's the same issue with insn renumbering: it makes debugging
*much* more difficult.

    The major benefit of reg squashing is reducing the size of the
    conflict matrix in the register allocators (it's square on the number
    of pseudos).

No, it's the square of the number of *allocnos*, which are the number of
registers *in use*.  That already takes care of the spareness problem.


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