Author: Lieven Clarisse
Date: 23:32:05 01/01/03
Go up one level in this thread
On January 01, 2003 at 19:36:56, Dieter Buerssner wrote:
>On January 01, 2003 at 11:50:58, Lieven Clarisse wrote:
>
>>I know for instance that:
>>
>>ptr=&R[i];
>>if((*ptr==3)||(*ptr==7)) {;}
>>
>>is faster then:
>>
>>if((R[i]==3)||(R[i]==7)) {;}
>
>How did you test it? I checked compiler generated assembly in similar cases.
>Typically, they are the same, using pointers or arrays. Sometimes arrays will be
>faster.
>
<SNIP>
>Regards,
>Dieter
I didn't test it, I read it in some dubious book. That is why I would like to
have a *good* book about optimization. The examples were only meant as examples,
here another one:
In the same book I read this:
#pragma intrinsic strcmp
would make your program faster when using strcmp, but they don't motivate why.
--> So anyone knows a GOOD book were I can find all such things in?
best regards,
lieven
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