m5::utility::FibonacciLFSR_Right< N, Taps > Class Template Reference

Fibonacci LFSRs (right-shift version) More...

#include <lfsr.hpp>

Public Types
using	state_type_t = std::bitset<N>
	State type.

Public Member Functions
const state_type_t &	state () const noexcept
	Gets the state.
template<typename UL = unsigned long, typename std::enable_if<(sizeof(UL) *CHAR_BIT >=64), std::nullptr_t >::type = nullptr>
uint64_t	value () const
	Gets the state value.
template<typename UL = unsigned long, typename std::enable_if<(sizeof(UL) *CHAR_BIT< 64), std::nullptr_t >::type = nullptr>
uint64_t	value () const
bool	step () noexcept
	Shift 1 step (Right). Returns output bit (LSB before shift)
uint64_t	step (const uint32_t nbits) noexcept
	Shift nbit steps and gets.
Constructor
	FibonacciLFSR_Right (const uint64_t seed) noexcept
	FibonacciLFSR_Right (const state_type_t s) noexcept
Helper
uint16_t	next16 () noexcept
	Shift 16 bits and get.
uint32_t	next32 () noexcept
	Shift 32 bits and get.
uint64_t	next64 () noexcept
	Shift 64 bits and get.

Static Protected Member Functions
template<uint32_t... Ts>
static bool	taps_xor (const std::bitset< N > &s)
static bool	taps_xor_all (const state_type_t &s)

Protected Attributes
state_type_t	_state

Detailed Description

template<uint32_t N, uint32_t... Taps>
class m5::utility::FibonacciLFSR_Right< N, Taps >

Fibonacci LFSRs (right-shift version)

Template Parameters

N	Value bit width (1..64)
Taps	Tap bit indexes (polynomial exponent)

Note

FibonacciLFSR_Right<16,16,14,13,11> means 16bits x^16 + x^14 + x^13 + x^11 + 1