amrex::Math::FastDivmodU64 Struct Reference

#include <AMReX_Math.H>

Public Member Functions
	FastDivmodU64 (std::uint64_t divisor_)
	FastDivmodU64 ()=default
	Default construct an invalid FastDivmodU64.
__host__ __device__ std::uint64_t	divide (std::uint64_t dividend) const
	Returns the quotient of floor(dividend / divisor)
__host__ __device__ std::uint64_t	modulus (std::uint64_t quotient, std::uint64_t dividend) const
	Computes the remainder given a computed quotient and dividend.
__host__ __device__ std::uint64_t	divmod (std::uint64_t &remainder, std::uint64_t dividend) const
	Returns the quotient of floor(dividend / divisor) and computes the remainder.
__host__ __device__ void	operator() (std::uint64_t &quotient, std::uint64_t &remainder, std::uint64_t dividend) const

Public Attributes
std::uint64_t	divisor = 0

Detailed Description

Object to encapsulate the fast division+modulus operation for 64b integer division.

Example:

uint64_t quotient, remainder, dividend, divisor;

FastDivmodU64 divmod(divisor);

divmod(quotient, remainder, dividend);

// quotient = (dividend / divisor) // remainder = (dividend % divisor)

Constructor & Destructor Documentation

FastDivmodU64() [1/2]

amrex::Math::FastDivmodU64::FastDivmodU64 ( std::uint64_t  divisor_ )

inline

FastDivmodU64() [2/2]

amrex::Math::FastDivmodU64::FastDivmodU64 ( )

default

Default construct an invalid FastDivmodU64.

Member Function Documentation

divide()

__host__ __device__ std::uint64_t amrex::Math::FastDivmodU64::divide ( std::uint64_t  dividend ) const

inline

Returns the quotient of floor(dividend / divisor)

divmod()

__host__ __device__ std::uint64_t amrex::Math::FastDivmodU64::divmod ( std::uint64_t &  remainder, std::uint64_t  dividend  ) const

inline

Returns the quotient of floor(dividend / divisor) and computes the remainder.

modulus()

__host__ __device__ std::uint64_t amrex::Math::FastDivmodU64::modulus ( std::uint64_t  quotient, std::uint64_t  dividend  ) const

inline

Computes the remainder given a computed quotient and dividend.

operator()()

__host__ __device__ void amrex::Math::FastDivmodU64::operator() ( std::uint64_t &  quotient, std::uint64_t &  remainder, std::uint64_t  dividend  ) const

inline

Computes integer division and modulus using precomputed values. This is computationally inexpensive.

Member Data Documentation

divisor

std::uint64_t amrex::Math::FastDivmodU64::divisor = 0

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The documentation for this struct was generated from the following file:

• /home/runner/work/amrex/amrex/Src/Base/AMReX_Math.H