[issue4753] Faster opcode dispatch on gcc

[Skip Montanaro]

Skip Montanaro <skip at pobox.com> added the comment:

Works pretty well for me on my MacBook Pro, but on my G5 it performed
abysmally.  In fact, it ran so much worse that I cleaned up my sandbox 
and did both checks all over again to make sure I didn't mess something
up.  It looks like my MacBook Pro saw about a 7% improvement while my
G5 saw a 14% degradation.  Both computers are running Mac OS X 10.5.6
with the latest Xcode - 3.1.2.  On both computers gcc -v reports 4.0.1,
Apple build 5490.

If this is applied to the core I think it will have to select for more
than just gcc.  It will also have to select based on the instruction set
architecture.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4753>
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