[issue4753] Faster opcode dispatch on gcc

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> This is safer than enabling the support unconditionally for GCC and
> the SUN Pro C compiler, since it is rather likely that some GCC versions
> have bugs which could render Python unusable if compiled with the
> dispatching support enabled.

What do you mean, "unusable"? 10% slower? Well, Python 3.x is already
unusable (compared to 2.x) by that metric... Until now, only Skip has
reported a slowdown on his PPC machine, while x86 systems have all seen
a positive (if tiny, sometimes) improvement.

I fear that with a configure option, disabled by default, the code will
get very poor testing and perhaps get broken in some subtle way without
anyone noticing.

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<http://bugs.python.org/issue4753>
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