[Python-Dev] Micro-optimizations by adding special-case bytecodes?

[Xavier Morel]

> On 2017-05-24, at 20:07 , Ben Hoyt <benhoyt at gmail.com> wrote:
> 
> Hi folks,
> 
> I was looking at some `dis` output today, and I was wondering if anyone has investigated optimizing Python (slightly) by adding special-case bytecodes for common expressions or statements involving constants?

Python 3.6 added an opcode specifically for dicts with constant keys:
https://bugs.python.org/issue27140. Though I guess that's a slightly
different case as it's not a peephole-fused opcode.