openswmm::simd Namespace Reference

Functions
void	add (const double *OPENSWMM_RESTRICT a, const double *OPENSWMM_RESTRICT b, double *OPENSWMM_RESTRICT dst, std::size_t n) noexcept
	Element-wise addition: dst[i] = a[i] + b[i].
void	multiply (const double *OPENSWMM_RESTRICT a, const double *OPENSWMM_RESTRICT b, double *OPENSWMM_RESTRICT dst, std::size_t n) noexcept
	Element-wise multiplication: dst[i] = a[i] * b[i].
double	min (const double *a, std::size_t n) noexcept
	Find the minimum value in an array.
double	max (const double *a, std::size_t n) noexcept
	Find the maximum value in an array.
void	clamp (double *a, double lo, double hi, std::size_t n) noexcept
	Clamp all elements of an array to [lo, hi].
double	dot (const double *OPENSWMM_RESTRICT a, const double *OPENSWMM_RESTRICT b, std::size_t n) noexcept
	Dot product of two arrays: sum(a[i] * b[i]).
constexpr std::size_t	lane_width () noexcept
	Returns the SIMD lane width (doubles per register on this platform).
void	sqrt_array (const double *OPENSWMM_RESTRICT a, double *OPENSWMM_RESTRICT dst, std::size_t n) noexcept
	Element-wise sqrt: dst[i] = sqrt(a[i]). Written as a simple loop; compilers auto-vectorize to platform-native SIMD (vsqrtq_f64 on ARM, _mm256_sqrt_pd on x86, etc.).
void	fabs_array (const double *OPENSWMM_RESTRICT a, double *OPENSWMM_RESTRICT dst, std::size_t n) noexcept
	Element-wise fabs: dst[i] = fabs(a[i]).
void	fma_array (const double *OPENSWMM_RESTRICT a, const double *OPENSWMM_RESTRICT b, const double *OPENSWMM_RESTRICT c, double *OPENSWMM_RESTRICT dst, std::size_t n) noexcept
	Element-wise fused multiply-add: dst[i] = a[i] * b[i] + c[i].

Function Documentation

add()

void openswmm::simd::add ( const double *OPENSWMM_RESTRICT  a, const double *OPENSWMM_RESTRICT  b, double *OPENSWMM_RESTRICT  dst, std::size_t  n  )

inlinenoexcept

Element-wise addition: dst[i] = a[i] + b[i].

Parameters

a	Source array A.
b	Source array B.
dst	Destination array.
n	Number of elements. Need not be a multiple of the SIMD width.

Note

Arrays may not alias each other (undefined behavior if they do).

clamp()

void openswmm::simd::clamp ( double *  a, double  lo, double  hi, std::size_t  n  )

inlinenoexcept

Clamp all elements of an array to [lo, hi].

Parameters

a	Array to clamp in-place.
lo	Lower bound.
hi	Upper bound.
n	Number of elements.

dot()

double openswmm::simd::dot ( const double *OPENSWMM_RESTRICT  a, const double *OPENSWMM_RESTRICT  b, std::size_t  n  )

inlinenoexcept

Dot product of two arrays: sum(a[i] * b[i]).

Note

Uses Kahan compensation on the scalar remainder to minimize floating-point accumulation error.

Parameters

a	Array A.
b	Array B.
n	Number of elements.

Returns

Sum of element-wise products.

fabs_array()

void openswmm::simd::fabs_array ( const double *OPENSWMM_RESTRICT  a, double *OPENSWMM_RESTRICT  dst, std::size_t  n  )

inlinenoexcept

Element-wise fabs: dst[i] = fabs(a[i]).

fma_array()

void openswmm::simd::fma_array ( const double *OPENSWMM_RESTRICT  a, const double *OPENSWMM_RESTRICT  b, const double *OPENSWMM_RESTRICT  c, double *OPENSWMM_RESTRICT  dst, std::size_t  n  )

inlinenoexcept

Element-wise fused multiply-add: dst[i] = a[i] * b[i] + c[i].

lane_width()

constexpr std::size_t openswmm::simd::lane_width ( )

constexprnoexcept

Returns the SIMD lane width (doubles per register on this platform).

max()

double openswmm::simd::max ( const double *  a, std::size_t  n  )

inlinenoexcept

Find the maximum value in an array.

min()

double openswmm::simd::min ( const double *  a, std::size_t  n  )

inlinenoexcept

Find the minimum value in an array.

Parameters

a	Array of doubles.
n	Number of elements. Must be >= 1.

Returns

Minimum value.

multiply()

void openswmm::simd::multiply ( const double *OPENSWMM_RESTRICT  a, const double *OPENSWMM_RESTRICT  b, double *OPENSWMM_RESTRICT  dst, std::size_t  n  )

inlinenoexcept

Element-wise multiplication: dst[i] = a[i] * b[i].

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sqrt_array()

void openswmm::simd::sqrt_array ( const double *OPENSWMM_RESTRICT  a, double *OPENSWMM_RESTRICT  dst, std::size_t  n  )

inlinenoexcept

Element-wise sqrt: dst[i] = sqrt(a[i]). Written as a simple loop; compilers auto-vectorize to platform-native SIMD (vsqrtq_f64 on ARM, _mm256_sqrt_pd on x86, etc.).