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Company: Has a very strict "No comment" policy, because comments bad code. Companies code: float Qrsqrt float number ) long i; float 2, y; const float threehalfs 1.5F; x2 number 0.5F; number; i ( long ) ; i 0x5f3759df – ( i 1 ); ( float ) i; y ( threehalfs – ( X2 y y ) ); return y;