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The complex lerp kernel uses `std::abs(z) < 0.5` which involves computing a sqrt. Instead compare the square against 0.25 has much lower latency and so performs much better overall. In a simple timeit benchmark I see more than 10x speedup on CPU for a 4096 element complex lerp, from 84 us to 6.7 us. ghstack-source-id: 3fd059b6e41f541a6a48b26d2c87e67c01fe236d Pull Request resolved: pytorch#84844
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