Function digitreverse4¶

`function` digitreverse4(const vec<T, N> &) simd ¶

template <size_t groupsize = 1, typename T, size_t N>
KFR_INTRINSIC vec<T, N> digitreverse4(const vec<T, N>& x)

Reorders the elements of a vector by reversing base-4 (quaternary) digits of their indices.

Similar to bitreverse, but uses radix 4 for digit reversal.

Template parameters
groupsize	Number of elements per group before applying reversal.
T	The element type of the vector.
N	The number of elements in the vector.

Parameters
x	The input vector to be reordered.

Returns
	A vector with base-4 digit-reversed indices.

Fully qualified name: kfr::digitreverse4(const vec<T, N> &)

template <size_t bits>
constexpr KFR_INTRINSIC u32 digitreverse4(u32 x) { … }

Reverses the digits of the given unsigned integer in base-4 (quaternary), using the lowest bits digits.

Useful for radix-4 FFT or similar algorithms.

Template parameters
bits	Number of base-4 digits to reverse.

Parameters
x	The input 32-bit unsigned integer.

Returns
	The base-4 digit-reversed integer.

Fully qualified name: kfr::digitreverse4(u32)

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