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* Optimized dataset read There was a false dependency on readReg2 and readReg3 (caused by `xor rbp, rax` instruction) when reading dataset item (see design.md - 4.6.2 Loop execution, steps 5 and 7). This change uses `ma` register to read dataset item before the whole `rbp` (`ma` and `mx`) is changed, so superscalar and out-of-order CPU can start executing it earlier. Results: https://i.imgur.com/Bpeq9mx.png ~1% speedup on modern Intel/AMD CPUs. * ARMv8: optimized dataset read Break dependency from readReg2 and readReg3. * Fixed light mode hashing
