EvoBitManipulation

Evo bit manipulation helpers. More...

Classes
struct	Bits< T, TSize >
	Traits and helpers for bit manipulation. More...

Functions
template<class T >
uint	bits_clz (T mask)
	Get leading zero count on bitmask. More...
uint	bits_clz16 (uint16 mask)
	Get leading zero count on bitmask (uint16). More...
uint	bits_clz32 (uint32 mask)
	Get leading zero count on bitmask (uint32). More...
uint	bits_clz64 (uint64 mask)
	Get leading zero count on bitmask (uint64). More...
uint	bits_clz8 (uint8 mask)
	Get leading zero count on bitmask (uint8). More...
bool	bits_cpu_popcnt ()
	Runtime check whether current CPU supports the POPCNT instruction. More...
template<class T >
int	bits_popcount (T mask)
	Get population count (number of bits set) for value. More...

Detailed Description

Evo bit manipulation helpers.

Function Documentation

bits_clz()

uint evo::bits_clz ( T  mask )

inline

Get leading zero count on bitmask.

• Caution: Different input sizes can give different results on same value so fixed-size functions like bits_clz32() are often preferred

Template Parameters

T	Mask type, inferred by param mask

Parameters

mask	Input bitmask

Returns

Leading zero count, NONE if mask is 0

See also

bits_clz8(), bits_clz16(), bits_clz32(), bits_clz64()

bits_clz16()

uint evo::bits_clz16 ( uint16  mask )

inline

Get leading zero count on bitmask (uint16).

Template Parameters

T	Mask type, inferred by param mask

Parameters

mask	Input bitmask

Returns

Leading zero count, NONE if mask is 0

See also

bits_clz(), bits_clz8(), bits_clz32(), bits_clz64()

bits_clz32()

uint evo::bits_clz32 ( uint32  mask )

inline

Get leading zero count on bitmask (uint32).

Template Parameters

T	Mask type, inferred by param mask

Parameters

mask	Input bitmask

Returns

Leading zero count, NONE if mask is 0

See also

bits_clz(), bits_clz8(), bits_clz16(), bits_clz64()

bits_clz64()

uint evo::bits_clz64 ( uint64  mask )

inline

Get leading zero count on bitmask (uint64).

Template Parameters

T	Mask type, inferred by param mask

Parameters

mask	Input bitmask

Returns

Leading zero count, NONE if mask is 0

See also

bits_clz(), bits_clz8(), bits_clz16(), bits_clz32()

bits_clz8()

uint evo::bits_clz8 ( uint8  mask )

inline

Get leading zero count on bitmask (uint8).

Template Parameters

T	Mask type, inferred by param mask

Parameters

mask	Input bitmask

Returns

Leading zero count, NONE if mask is 0

See also

bits_clz(), bits_clz16(), bits_clz32(), bits_clz64()

bits_cpu_popcnt()

bool evo::bits_cpu_popcnt ( )

inline

Runtime check whether current CPU supports the POPCNT instruction.

• MSVC: Checks whether CPU for this instruction
  • See: https://docs.microsoft.com/en-us/cpp/intrinsics/popcnt16-popcnt-popcnt64
• Other compilers: Always returns false

Returns

Whether POPCNT instruction is supported

See also

bits_popcount()

bits_popcount()

int evo::bits_popcount ( T  mask )

inline

Get population count (number of bits set) for value.

Template Parameters

T	Mask type (inferred from argument)

Parameters

mask	Bit mask to use

Returns

Number of bits set in mask