CASESI: GCC is optimising away my cases

[Jeffrey A Law]

  In message < 199912141720.RAA11121@rocoto >you write:
  > 
  > I've created a `casesi' pattern which outputs code for jumping via the
  > table.  This produces the expected code. However, when I run the compiler
  > with any optimisation enabled, it removes the blocks of code referred to
  > in the dispatch table.
  > 
  > What it looks like is happening is that the jump optimisation cannot find a
  > jump which refers to the routines (as they are done indirectly via the
  > dispatch table),
This is your problem.  You need to show at the RTL level that each label
is used.

Your casesi pattern should be followed by an ADDR_VEC or ADDR_DIFF_VEC insn
which should contain a reference to each target label.  Why is that not
happening?

jeff