math.hpp File Reference

Scalar math helpers usable in constant expressions. More...

#include <cmath>
#include <tdls/core/macros.hpp>

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Functions
template<typename T >
TDLS_HOST_DEVICE TDLS_FORCEINLINE constexpr T	tdls::detail::abs (const T x) noexcept
	Absolute value usable in constant expressions.

Detailed Description

Scalar math helpers usable in constant expressions.

Author

Tristan Chenaille

Copyright

Copyright (C) 2026 CEA. All rights reserved. This project is publicly released under the BSD 3-Clause License (see the LICENSE file). CEA may also distribute it under specific licensing conditions.

Function Documentation

abs()

template<typename T >

TDLS_HOST_DEVICE TDLS_FORCEINLINE constexpr T tdls::detail::abs ( const T x )

nodiscardconstexprnoexcept

Absolute value usable in constant expressions.

std::fabs is not constexpr before C++23, so constant evaluation falls back to a ternary, indistinguishable from std::fabs in the magnitude comparisons of the solvers (signed zeros compare equal, NaNs propagate either way). At run time the function IS std::fabs: the naive ternary alone would forbid the single sign-bit instruction (it must preserve -0.0) and was measured 3% heavier in device code on the pivot search.

Template Parameters

T	scalar type

Parameters

[in]

x

value

Returns

the absolute value of x