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Showing content from https://mail.python.org/pipermail/python-dev/2011-January/107791.html below:

[Python-Dev] short fetch for NEXTARG macro (was: one byte byte code arguments)

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I just did it: my first python source code hack.
I replaced the NEXTARG and PEEKARG macros in ceval.c using a cast to  
short pointer, and lo and behold, a crude measurement indicates one  
to two percent speed increase.
That isn't much, but it is virtually for free!

Here are the macro's I used:
#define NEXTARG() (next_instr +=2, *(short*)&next_instr[-2])
#define PEEKARG() (*(short*)&next_instr[1])

- Jurjen

• Previous message: [Python-Dev] Followup: Byte code arguments from two to one byte: did anyone try this?
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