Hrvoje Niksic wrote:
> "Diez B. Roggisch" <[EMAIL PROTECTED]> writes:
>
>>> Eg:
>>> a = 1 + 2
>>> .vs.
>>> a = 3
>>> which one is more effective? Does the compiler calculate the result at
>>> compile time? How about constant spreading?
>>
>> Algebraic optimizations aren't done AFAIK
>
> Just try it:
>
> Python 2.5.1 (r251:54863, Oct 5 2007, 13:36:32)
> [GCC 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> dis.dis(lambda: 10+5)
> 1 0 LOAD_CONST 2 (15)
> 3 RETURN_VALUE
I remember times when that hasn't been the case - thus my answer.
[GCC 3.4.6 (Ubuntu 3.4.6-6ubuntu2)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
Welcome to rlcompleter2 0.96
for nice experiences hit <tab> multiple times
>>> import dis
>>> dis.dis(lambda: 1+2)
1 0 LOAD_CONST 1 (1)
3 LOAD_CONST 2 (2)
6 BINARY_ADD
7 RETURN_VALUE
Python 2.4.4 (#2, Mar 7 2008, 04:45:43)
[GCC 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import dis
>>> dis.dis(lambda: 1+2)
1 0 LOAD_CONST 1 (1)
3 LOAD_CONST 2 (2)
6 BINARY_ADD
7 RETURN_VALUE
>>>
But great to know it is done now.
Diez
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