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

[Xavier Morel]

> On 2017-05-24, at 20:26 , Xavier Morel <python-dev at masklinn.net> wrote:
> 
>> 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.

And followup, Python 2.7 did add fused opcodes related to conditional: 
http://bugs.python.org/issue4715.