[pypy-dev] Re: psyco in Python was: Minimal Python project

[Thomas Fanslau]

Michael Hudson wrote:

>>2. I have looked again at the code generators of the optimizing C compiler I
>>wrote about 10 years ago.  I can find no instance where knowing the value
>>of an operand, rather than just its type, would produce better code. 
>>    
>>
>
>?  Surely in compiling
>
>if (x < 10) {
>    ...
>} else {
>    ...
>}
>  
>
And don't forget the obvious replacement of a multiply by some shifts, 
so multiply by 5 can be replaced by a copy, a right shift 2 places and a 
add instead of a costly multiply ...

--tf