From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeffrey A Law <law@cygnus.com>
To: pmw@uk.research.att.com (Paul Webster)
Cc: gcc-help@gcc.gnu.org
Subject: Re: CASESI: GCC is optimising away my cases 
Date: Fri, 31 Dec 1999 22:24:00 -0000
Message-ID: <30635.945193689@upchuck>
References: <199912141720.RAA11121@rocoto>
X-SW-Source: 1999-12n/msg00219.html
Message-ID: <19991231222400.Sijb9H9jbJ4J0wDgLB0vKqUmGby-ZApd4XGf2v0-abM@z>

  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