2016年04月13日 23:02 GMT+02:00 Eric Fahlgren <[email protected]>: > Percentage of 1-byte args = 96.80%
Yeah, I expected such high ratio. Good news that you confirm it. > Non-argument ops = 53,719 > One-byte args = 368,787 > Multi-byte args = 12,191 Again, only a very few arguments take multiple bytes. Good, the bytecode will be smaller. IMHO it's more a nice side effect than a real goal. The runtime performance matters more than the size of the bytecode, it's not like a bytecode take 4 MB. It's probably closer to 1 KB and so can probably benefit of the fatest CPU caches. > Just for the record, here's my arithmetic: > byteCodeSize = 1*nonArgumentOps + 3*oneByteArgs + 3*multiByteArgs > wordCodeSize = 2*nonArgumentOps + 2*oneByteArgs + 4*multiByteArgs If multiByteArgs means any size > 1 byte, the wordCodeSize formula is wrong: - no parameter: 2 bytes - 8-bit parameter: 2 bytes - 16-bit parameter: 4 bytes - 24-bit parameter: 6 bytes - 32-bit parameter: 8 bytes But you wrote that you didn't see EXTEND_ARG, so I guess that multibyte means 16-bit in your case, and so your formula is correct. Hopefully, I don't expect 32-bit parameters in the wild, only 24-bit parameter for function with annotation. > (It is interesting to note that I have never encountered an EXTENDED_ARG > operator in the wild, only in my own synthetic examples.) As I wrote, EXTENDED_ARG can be seen when MAKE_FUNCTION is used with annotations. Victor _______________________________________________ Python-Dev mailing list [email protected] https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com