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vshlq_n_s32, vshrq_n_s32 take a compile time constant value as its parameter, so I used vshlq_s32. https://developer.arm.com/documentation/dui0491/i/Using-NEON-Support/Shifts-by-a-constant And vsh”r”q_s32 doesn’t exist because left-shift of a negative value means right-shift. https://developer.arm.com/documentation/dui0491/i/Using-NEON-Support/Shifts-by-signed-variable