New submission from Raymond Hettinger <raymond.hettin...@gmail.com>:
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.
----------
components: Argument Clinic
messages: 326659
nosy: larry, rhettinger, serhiy.storchaka, vstinner
priority: low
severity: normal
status: open
title: Improve arg clinic code generation for cases with type checking
type: performance
versions: Python 3.8
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34838>
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