This paper describes two Haskell libraries for property-based testing. Following the lead of QuickCheck, these testing libraries SmallCheck and Lazy SmallCheck also use type-based generators to obtain test-sets of finite values for which properties are checked, and report any counter-examples found. But instead of using a sample of randomly generated values they test properties for all values up to some limiting depth, progressively increasing this limit. The paper explains the design and implementation of both libraries and evaluates them in comparison with each other and with QuickCheck.
The leading implementations of graph reduction all target conventional processors designed for low-level imperative execution. In this paper, we present a processor specially designed to perform graph-reduction. Our processor -- the Reduceron -- is implemented using off-the-shelf reconfigurable hardware. We highlight the low-level parallelism present in sequential graph reduction, and show how parallel memories and dynamic analyses are used in the Reduceron to achieve an average reduction rate of 0.55 function applications per clock-cycle.
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