[Python-Dev] cpython: hashtable.h now supports keys of any size
storchaka at gmail.com
Wed Mar 23 13:37:31 EDT 2016
On 21.03.16 23:01, victor.stinner wrote:
> changeset: 100640:aca4e9af1ca6
> user: Victor Stinner <victor.stinner at gmail.com>
> date: Mon Mar 21 22:00:58 2016 +0100
> hashtable.h now supports keys of any size
> Issue #26588: hashtable.h now supports keys of any size, not only
> sizeof(void*). It allows to support key larger than sizeof(void*), but also to
> use less memory for key smaller than sizeof(void*).
If key size is compile time constant, Py_MEMCPY() and memcpy() can be
optimized in one machine instruction. If it is ht->key_size, it adds
more overhead. These changes can have negative performance effect.
It can be eliminated if pass a compile time constant to
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