Re: Question about cfgrtl.c:flow_delete_block_noexpunge

[Richard Henderson <rth at redhat dot com>]

On Tue, Jun 10, 2003 at 08:41:32PM -0600, law@redhat.com wrote:
> Kenner -- if you really want to fix this problem, attach the jump table
> to the tablejump/switch insn itself.  Doing that would enable cleanups
> in several places within the compiler.

Given my druthers, I wouldn't do that either.  I'd have the
jump tables in a data structure external to the insn stream.

Consider that with the single exception of VAX and its funny
casesi instruction, there is no architecture that absolutely
requires the table to be adjacent to the jump insn (there are
several that benefit from it, like arm, m68k, sh, but...).
Keeping the table external means that we can solve problems
related to basic block replication in trace scheduling and
the like.


r~