Message326659
| Author | rhettinger |
|---|---|
| Recipients | larry, rhettinger, serhiy.storchaka, vstinner |
| Date | 2018-09-28.21:15:58 |
| SpamBayes Score | -1.0 |
| Marked as misclassified | Yes |
| Message-id | <1538169358.96.0.545547206417.issue34838@psf.upfronthosting.co.za> |
| In-reply-to |
| Content | |
|---|---|
An arg clinic specification such as
p: object(subclass_of='&PyTuple_Type')
generates slow code using _PyArg_ParseStack() that has to parse a format string like "O!" to decide to make a type check. Instead, it should directly generate a branch-predictable test for the type check and then call the much quicker function _PyArg_UnpackStack().
See https://github.com/python/cpython/pull/9628 for an example of this change giving a 30% speedup. |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2018-09-28 21:15:58 | rhettinger | set | recipients: + rhettinger, vstinner, larry, serhiy.storchaka |
| 2018-09-28 21:15:58 | rhettinger | set | messageid: <1538169358.96.0.545547206417.issue34838@psf.upfronthosting.co.za> |
| 2018-09-28 21:15:58 | rhettinger | link | issue34838 messages |
| 2018-09-28 21:15:58 | rhettinger | create | |