[Python-Dev] Opcode frequency
python at rcn.com
Thu Jun 19 01:03:19 CEST 2008
> Maciej Fijalkowski did an opcode analysis for PyPy,
> it also shows the relative frequency of opcodes following a
> specifc one:
> Might it make sense to add more PREDICT()ions based
> on this, e.g. for BUILD_SLICE -> BINARY_SUBSCR?
This particular one might be okay. What code generates it?
Are there other possible successors to BUILD_SLICE?
What code generates those?
There were lots of other opcode pairings that were previously
studied and rejected. You're going over well traveled ground.
Also, opcode analysis is a somewhat hazardous undertaking.
Dynamic analysis takes into account which codes tend to
occur more often inside loops but it is *very* sensitive
to who wrote the app and their coding style. These results
always have to be taken with a grain of salt.
More information about the Python-Dev