Message 184311 - Python tracker

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Author	vstinner
Recipients	Neal.Norwitz, vstinner
Date	2013-03-16.13:34:15
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1363440856.09.0.381103302961.issue17430@psf.upfronthosting.co.za>
In-reply-to

Content
> The 2 JUMP_ABSOLUTEs should be optimized away since the code is equivalent to: if a and b and c: as in: Oh, I misread this sentence. I read that you would like to replace "if a: if b:" with "if a and b:". But it can be optimized differently: the useless jump can be removed during the bytecode generation. I implemented replace "if a: if b:" with "if a and b:" in astoptimizer: https://bitbucket.org/haypo/astoptimizer/commits/195df21d1dc30a21d0330e84794186488f266c29#chg-astoptimizer/optimizer.py I already implemented removal of useless jumps in my second project, registervm: http://hg.python.org/sandbox/registervm/file/f720340910ea/Lib/registervm.py#l1756 Read this file to learn more about my registervm project: http://hg.python.org/sandbox/registervm/file/tip/REGISTERVM.txt

> The 2 JUMP_ABSOLUTEs should be optimized away since the code is equivalent to: if a and b and c: as in:

Oh, I misread this sentence. I read that you would like to replace "if a: if b:" with "if a and b:". But it can be optimized differently: the useless jump can be removed during the bytecode generation.

I implemented replace "if a: if b:" with "if a and b:" in astoptimizer:

https://bitbucket.org/haypo/astoptimizer/commits/195df21d1dc30a21d0330e84794186488f266c29#chg-astoptimizer/optimizer.py

I already implemented removal of useless jumps in my second project, registervm:

http://hg.python.org/sandbox/registervm/file/f720340910ea/Lib/registervm.py#l1756

Read this file to learn more about my registervm project:
http://hg.python.org/sandbox/registervm/file/tip/REGISTERVM.txt

History
Date	User	Action	Args
2013-03-16 13:34:16	vstinner	set	recipients: + vstinner, Neal.Norwitz
2013-03-16 13:34:16	vstinner	set	messageid: <1363440856.09.0.381103302961.issue17430@psf.upfronthosting.co.za>
2013-03-16 13:34:16	vstinner	link	issue17430 messages
2013-03-16 13:34:15	vstinner	create