Re:Fast Inverse Square Root
by dragontamer on Tuesday November 03, 2020 @09:01AM
(#24979699)
AMD Vega has "V_RSQ_F32" (Reciprocal Square Root"), and NVidia has rsqrt.approx.f32. ARM has vrecpsq_f32.
So all the major platforms, CPUs and GPUs, implement the fast reciprocal square root to decent amounts of accuracy, without any need of bit-twiddling anymore.
So all the major platforms, CPUs and GPUs, implement the fast reciprocal square root to decent amounts of accuracy, without any need of bit-twiddling anymore.