STINNER Victor added the comment:

I reviewed wpy3.patch.

I concur with Raymond, it's really nice to have a regular structure for the 
bytecode.

--

Serhiy proposed to *reduce* the size of bytecode by adding new specialized 
bytecode which include the argument. For example (LOAD_CONST, 0) => 
LOAD_CONST_0. I would like to hear his opinion on this change.
https://mail.python.org/pipermail/python-ideas/2016-February/038276.html

Data+code loaded by import is the top #1 memory consumer on basic scripts 
according to tracemalloc:
https://docs.python.org/dev/library/tracemalloc.html#examples

I don't know the ratio between data and code. But here we are only talking 
about the co_code fields of code objects. I guess that the file size of .pyc is 
a good estimation.

I don't think that the memory footprint of bytecode (co_code fields of code 
objects) really matters on computers (and smartphones?) of 2016.

*If* I have to choose between CPU performance and memory footprint, I choose 
the CPU!

--

> This does _not_ include having f_lasti be -1 instead of -2

IMHO it's ok to break the C API, but I would prefer to keep the backward 
compatibility for the Python API (replace any negative number with -1 for the 
Python API).

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<http://bugs.python.org/issue26647>
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