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Implement ThreadReduce and ThreadScan alternatives that invoke the binary_op only for the given valid_items #5192
Description
BlockScan member function overloads taking multiple items per thread use ThreadReduce and ThreadScan[Inclusive, Exclusive] to map the problem to the single-element overloads, so having alternative functions that take a dynamic valid_items parameter and don't apply the binary operator to any invalid items is a prerequisite of #5119.
Activity
BlockScanoverloads that invoke thebinary_oponly for the givennum_items#5119[-]Implement `ThreadReduce` and `ThreadScan` overloads that invoke the `binary_op` only for the given `num_items`[/-][+]Implement `ThreadReduce` and `ThreadScan` alternatives that invoke the `binary_op` only for the given `num_items`[/+][-]Implement `ThreadReduce` and `ThreadScan` alternatives that invoke the `binary_op` only for the given `num_items`[/-][+]Implement `ThreadReduce` and `ThreadScan` alternatives that invoke the `binary_op` only for the given `valid_items`[/+]