[issue4715] optimize bytecode for conditional branches

[Antoine Pitrou]

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

Hello,

> I've backported condbranches-plus.patch to trunk, and I'm getting these 
> results:

Thanks!

> PyBench: 1.84-2.21% faster
> 2to3: 3.83% faster
> Spitfire: 6.13-6.23% faster

What is Spitfire?

> I've haven't tested condbranches.patch vs condbranches-plus.patch; what 
> difference are you seeing, Antoine?

condbranches.patch is the earlier version (without POP_OR_JUMP and
JUMP_OR_POP), it can be ignored.

> This patch mostly looks good, though you still need to change Doc/
> library/dis.rst and the pure-Python compiler package.

Well, the pure-Python compiler package doesn't exist in py3k, for which
I've initially made the patch.
(and its state in 2.x is very sorry...)

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