Message314769
| Author | serhiy.storchaka |
|---|---|
| Recipients | benjamin.peterson, brett.cannon, ncoghlan, serhiy.storchaka, yselivanov |
| Date | 2018-04-01.10:29:26 |
| SpamBayes Score | -1.0 |
| Marked as misclassified | Yes |
| Message-id | <1522578566.75.0.467229070634.issue33200@psf.upfronthosting.co.za> |
| In-reply-to |
| Content | |
|---|---|
The following PR optimizes bytecode for the empty set "literal": {*()}.
Currently it is compiled to
LOAD_CONST 0 (())
BUILD_SET_UNPACK 1
It will optimized to
BUILD_SET 0
$ ./python -m perf timeit --duplicate 1000 '{*()}'
Unpatched: Mean +- std dev: 68.6 ns +- 1.1 ns
Patched: Mean +- std dev: 31.8 ns +- 2.8 ns |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2018-04-01 10:29:26 | serhiy.storchaka | set | recipients: + serhiy.storchaka, brett.cannon, ncoghlan, benjamin.peterson, yselivanov |
| 2018-04-01 10:29:26 | serhiy.storchaka | set | messageid: <1522578566.75.0.467229070634.issue33200@psf.upfronthosting.co.za> |
| 2018-04-01 10:29:26 | serhiy.storchaka | link | issue33200 messages |
| 2018-04-01 10:29:26 | serhiy.storchaka | create | |