Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

Marking this as "pending".  It is more of a personal research project than a 
bug report, feature request, or known optimization.

The underlying hypothesis is that compilers aren't smart enough to generate 
good code for a simple for-loop that moves data.

The evidence is weak as involves timing unusual cases, with significantly 
different calling patterns, and that make repeated calls to realloc() which can 
throw the results off wildly.

----------
priority: normal -> low
status: open -> pending
versions: +Python 3.9 -Python 3.8

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39801>
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