Ken Foskey <foskey@xxxxxxxxxxxxxxxx> writes:
> The following code gives me an uninitialised warning on nCol. There is
> no possible default clause for this one.
>
> switch( nXIndex & 3 )
> {
> case 0 :
> nCol = *pTmp >> 6;
> break;
> case 1 :
> nCol = ( *pTmp >> 4 ) & 0x03 ;
> break;
>
> case 2 :
> nCol = ( *pTmp >> 2 ) & 0x03;
> break;
> case 3 :
> nCol = ( *pTmp++ ) & 0x03;
> break;
> }
There will always be cases where gcc guesses wrong on this; it is not
only very hard, but provably impossible to get it always right.
In this case however, it indicates an optimizer deficiency. You could
try to file a bug report about it.
By the way, please always post complete test cases and include version
and command line options.
--
Falk
