Author: Sune Fischer
Date: 11:10:45 07/04/03
Go up one level in this thread
On July 04, 2003 at 13:56:09, Normand M. Blais wrote:
>Hi,
>
>First, I would like to thanks everybody for their help. No one can succeed
>alone.
>
>The problem that I had was that my program would not run properly when compile
>with optimization for speed but would run ok in debug version or in release
>version with default optimization. I found that the problem was with a specific
>function and the way it was coded:
>
>// This fuction runs with no problem in debug version or release version with
>// default optimization.
>// But it fails in release version with optimization for speed.
>inline int s2i(const char *str)
>{
> // input: a square name (string) (ex: e4)
> // output: a square number (integer) (ex: 36)
>
> int sq = (*str - 'a') + (8 * (8 - (*(++str) - '0')));
Can't it have something to do with the order of execution?
Isn't the compiler free to do *str both before and after ++str?
-S.
> if (sq >= 0 && sq <= 63) return sq;
>
> return -1;
>}
>
>
>// This function runs fine (with or without optimization).
>inline int s2i(const char *str)
>{
> // input: a square name (string) (ex: e4)
> // output: a square number (integer) (ex: 36)
>
> int sq = (str[0] - 'a') + (8 * (8 - (str[1] - '0')));
>
> if (sq >= 0 && sq <= 63) return sq;
>
> return -1;
>}
>
>
>Why the first version of the function causes problem is not clear to me. Anyway.
>I felt that it is fare for me to share this information taking into account that
>I benefit greatly from others.
>
>Thank you,
>
>Normand
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