reciprocalSqrt abstract method
Lane-wise approximation of reciprocal square root.
Approximates the same result as reciprocal followed by sqrt, or sqrt followed by reciprocal, but may be more precise and/or efficient due to computing the result directly, rather than not creating a an intermediate result, and possibly by working entirely at a reduced precision.
The result can differ between platforms due to differences in
approximation and precision, and for values where the order of sqrt and
reciprocal makes a difference.
The latter applies specifically to -0.0
where sqrt(-0.0) is defined to be -0.0,
and reciprocal of that is -Infinity.
In the opposite order it computes sqrt of -Infinity which is NaN.
Implementation
Float32x4 reciprocalSqrt();