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p is now evaluated a little bit differently but arrives at the same numerical value. We are now leveraging a technique known as Estrin's Scheme to rewrite this equation. With the above, the compiler (and CPU) can evaluate a3 * abs_x + a2 and a1 * abs_x + a0 independently of each other. This reduces the dependency chain length from three to two, allowing modern out-of-order CPUs to execute these operations in parallel. For those unaware, this is Instruction-level parallelism.