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We describe a SAT solver using both the GPU (CUDA) and the CPU with a newclause exchange strategy. The CPU runs a classic multithreaded CDCL SAT solver.EachCPU thread exports all the clauses it learns to the GPU. The GPU makes aheavy usage of bitwise operations. It notices when a clause would have beenused by a CPU thread and notifies that thread, in which case it imports thatclause. This relies on the GPU repeatedly testing millions of clauses againsthundreds of assignments. All the clauses are tested independantly from eachother (which allows the GPU massively parallel approach), but against all theassignments at once, using bitwise operations. This allows CPU threads to onlyimport clauses which would have been useful for them. Our solver is based uponglucose-syrup. Experiments show that this leads to a strong performanceimprovement, with 22 more instances solved on the SAT 2020 competition thanglucose-syrup.

GpuShareSat: a SAT solver using the GPU for clause sharing