R0 = 5
Tries to tidy the heap, reducing the WimpSlot if possible. This can be automatically performed once a second (in WimpExt_PrePoll) if you set bit 3 of R2 when you called WimpExt_Initialise. Note that this routine does not tidy the heap fully, it just does a little bit each time it is called. This is to keep the time cost down.
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