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Compiler optimizations question

The C modest god · 2002-04-17T16:52:23

Would visualC++6 optimze the two different(doing the same) codes differently?(second code faster) (compiled as C) LPBYTE a, b, c; first code: *a = *c; *b = *c; second code: *a = *b = *c; Waiting for reply. Thanks in advance.

General and Gameplay Programming Programming

Started by The C modest god April 17, 2002 03:49 AM

11 comments, last by The C modest god 22 years ago

Kylotan

10,510

April 17, 2002 11:22 AM

DrPizza

160

April 17, 2002 12:53 PM

Can we standardize some code to put between the declarations their usage?

It makes a massive difference on what this optmizer does.

I mean, this optimizer turns it basically into nothing, because the variables are stuck in registers.

char a[99999],*p=a;int main(int c,char**V){char*v=c>0?1[V]:(char*)V;if(c>=0)for(;*v&&93!=*v;){62==*v&&++p||60==*v&&--p||43==*v&&++*p||45==*v&&--*p||44==*v&&(*p=getchar())||46==*v&&putchar(*p)||91==*v&&(*p&&main(0,(char**)(--v+2))||(v=(char*)main(-1,(char**)++v)-1));++v;}else for(c=1;c;c+=(91==*v)-(93==*v),++v);return(int)v;}  /*** drpizza@battleaxe.net ***/

Dean Harding

546

April 17, 2002 04:52 PM

quote:Original post by The C modest god
I wouldn''t ask it if I didn''t intend to use this code in a critical section.

Show me code where one less memory reference would actually make a noticable difference.

codeka.com - Just click it.

Compiler optimizations question

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