BitBltSimulation>>copyLoop, read ahead memory failure.

John M McIntosh johnmci at
Fri Oct 13 05:10:09 UTC 2006

On 12-Oct-06, at 9:50 PM, Andreas Raab wrote:

> Yes, it has always been that way. copyLoop reads one word after the  
> end of the bitmap. It's never used but it'll attempt to touch the  
> memory.
> Cheers,
>   - Andreas

Ok, well should it read ?

		"This last section, if used, requires masking of the destination  
		(nWords > 1 and: [(preload and: [i=bbH]) not]) ifTrue: []

where we check preload and if the i value is equal to the height we  
don't do the prefetch?
Does that sound reasonable?

John M. McIntosh <johnmci at>
Corporate Smalltalk Consulting Ltd.

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