[issue32346] Speed up slot lookup for class creation

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Updated benchmarks against git master (and using pyperf):

- before:

$ ./env-orig/bin/pyperf timeit -q "class Test: pass"
Mean +- std dev: 8.89 us +- 0.09 us
$ ./env-orig/bin/pyperf timeit -q -s "from logging import Logger" "class Test(Logger): pass"
Mean +- std dev: 12.0 us +- 0.2 us
$ ./env-orig/bin/pyperf timeit -q -s "from unittest.mock import MagicMock" "class Test(MagicMock): pass"
Mean +- std dev: 18.6 us +- 0.2 us

- after:

$ ./env/bin/pyperf timeit -q "class Test: pass"
Mean +- std dev: 6.90 us +- 0.11 us
$ ./env/bin/pyperf timeit -q -s "from logging import Logger" "class Test(Logger): pass"
Mean +- std dev: 5.86 us +- 0.08 us
$ ./env/bin/pyperf timeit -q -s "from unittest.mock import MagicMock" "class Test(MagicMock): pass"
Mean +- std dev: 6.13 us +- 0.08 us

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32346>
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