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when a operation receives a chain of OINDEX nodes as its operands, each indexing step used to allocate a new index register. this is wastefull an can result in running out of fixed registers on 386 for code such as: x = a[a[a[a[i]]]]. instead we attempt to reuse the destination register of the operation as the index register if it is not otherwise referenced. this results in the index chain to use a single register for index and result and leaves registers free to be used for something usefull instead. for 6c, try to avoid R13 as well as BP index base register. |
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