New submission from STINNER Victor:
Example:
---
def func(x, y):
print(x, y)
def proxy2(func, **kw):
func(**kw)
def proxy1(func, **kw):
proxy2(func, **kw)
---
The "proxy2(func, **kw)" call in proxy1() is currently inefficient:
_PyFunction_FastCallDict() converts the dictionary into a C array [key1,
value1, key2, value2, ...] and then _PyEval_EvalCodeWithName() rebuilds the
dictionary from the C array.
Since "func(*args, **kw)" proxies are common in Python, especially to call the
parent constructor when overriding __init__, I think that it would be
interesting to optimize this code path.
I first expected that it was a regression of FASTCALL, but Python < 3.6 doesn't
optimize this code neither.
----------
components: Interpreter Core
messages: 285773
nosy: haypo, inada.naoki
priority: normal
severity: normal
status: open
title: Optimize _PyFunction_FastCallDict() for **kwargs
type: performance
versions: Python 3.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue29318>
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