Message 269350 - Python tracker

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Author	rhettinger
Recipients	rhettinger, serhiy.storchaka
Date	2016-06-27.05:20:07
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<[email protected]>
In-reply-to

Content
The second version of the patch mostly looks fine. The prediction from DUP_TOP_TWO to BINARY_SUBSCR is questionable. Because compile.c only uses it one context, the prediction rate is 100%; however, there is no intrinsic relationship between the two opcodes, so the prediction is happenstance and fragile. Reconsider whether you really want this prediction pairing.

The second version of the patch mostly looks fine.  

The prediction from DUP_TOP_TWO to BINARY_SUBSCR is questionable.  Because compile.c only uses it one context, the prediction rate is 100%; however, there is no intrinsic relationship between the two opcodes, so the prediction is happenstance and fragile.  Reconsider whether you really want this prediction pairing.

History
Date	User	Action	Args
2016-06-27 05:20:07	rhettinger	set	recipients: + rhettinger, serhiy.storchaka
2016-06-27 05:20:07	rhettinger	set	messageid: <[email protected]>
2016-06-27 05:20:07	rhettinger	link	issue27255 messages
2016-06-27 05:20:07	rhettinger	create