optimizer version 0.01
======================

    optimizer - Write your own Perl optimizer, in Perl

SYNOPSIS
      # Use Perl's default optimizer
      use optimizer 'C'; 

      # Use a Perl implementation of the default optimizer
      use optimizer 'perl'; 

      # Use an extension of the default optimizer
      use optimizer extend => sub {
            warn "goto considered harmful" if $_[0]-1>name eq "goto"
      }

      # Use a simple optimizer with callbacks for each op
      use optimizer callback => sub { .. }

      # Completely implement your own optimizre
      use optimizer mine => sub { ... }

      no optimizer; # Use the simplest working optimizer

DESCRIPTION
    This module allows you to replace the default Perl optree optimizer,
    "peep", with a Perl function of your own devising.

    It requires a Perl patched with the patch supplied with the module
    distribution; this patch allows the optimizer to be pluggable and
    replaceable with a C function pointer. This module provides the glue
    between the C function and a Perl subroutine. It is hoped that the patch
    will be integrated into the Perl core at some point soon.

    Your optimizer subroutine will be handed a "B::OP"-derived object
    representing the first (NOT the root) op in the program. You are
    expected to be fluent with the "B" module to know what to do with this.
    You can use "B::Generate" to fiddle around with the optree you are
    given, while traversing it in execution order.

    If you choose complete control over your optimizer, you must assign
    sequence numbers to operations. This can be done via the
    "optimizer::op_seqmax_inc" function, which supplies a new incremented
    sequence number. Do something like this:

        while ($$op) {
            $op->seq(optimizer::op_seqmax_inc);

            ... more optimizations ...

            $op = $op->next; 
            last unless $op->can("next"); # Shouldn't get here
        }

    The "callback" option to this module will essentially do the above,
    calling your given subroutine with each op.

INSTALLATION

To install this module type the following:

   perl Makefile.PL
   make
   make test
   make install

DEPENDENCIES

THIS MODULE REQUIRES A CORE PATCH. Stop now if that
worries you.

    B::Generate

COPYRIGHT AND LICENCE

GPL & AL

Copyright (C) 2001 Simon Cozens