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

[Jurjen N.E. Bos]

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