a.out gives different results when compiled by g++ 3.1 and g++ 3.1 -O

[Erick Alphonse]

Falk Hueffner wrote:

>> enum {N = 624,              // length of state vector
>>       M = 397,              // period parameter
>>       MAGIC = 0x9908B0DFU}; // magic constant
>>
>> ui32 state[N];              // internal state
>>[...]
>>*p++ = twist( p[M-N], p[0], p[1] );
>>
> 
> You're accessing out of the array bounds here, so anything might
> happen.
> 


Dear Falk,

I have found the latest version of the code, and the guy goes:
v0.7 - Fixed operator precedence ambiguity in reload()

which gives:
	for( i = N - M; i--; ++p )
		*p = twist( p[M], p[0], p[1] );
	for( i = M; --i; ++p )
		*p = twist( p[M-N], p[0], p[1] );

I suppose it's what your were talking about. So there is no standard and 
the behaviour may depend on optmization?

Regards,
Erick.