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math: add muldiv

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Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2023-12-22 21:35:56 +01:00
parent 024f3f7172
commit 9c9fd9d05a
1 changed files with 56 additions and 0 deletions
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56
include/stdex/math.hpp
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@ -83,4 +83,60 @@ namespace stdex
return (value << bits) | (value >> (32 - bits)); return (value << bits) | (value >> (32 - bits));
#endif #endif
} }
///
/// Calculate n*k/q
///
/// \param[in] n Number
/// \param[in] k Numerator
/// \param[in] q Denominator
///
/// \return n*k/q
///
inline constexpr int32_t muldiv(int32_t n, int32_t k, int32_t q)
{
return static_cast<int32_t>(static_cast<int64_t>(n) * k / q);
}
///
/// Calculate n*k/q
///
/// \param[in] n Number
/// \param[in] k Numerator
/// \param[in] q Denominator
///
/// \return n*k/q
///
inline constexpr uint32_t muldiv(uint32_t n, uint32_t k, uint32_t q)
{
return static_cast<uint32_t>(static_cast<uint64_t>(n) * k / q);
}
///
/// Calculate n*k/q
///
/// \param[in] n Number
/// \param[in] k Numerator
/// \param[in] q Denominator
///
/// \return n*k/q
///
inline constexpr int64_t muldiv(int64_t n, int64_t k, int64_t q)
{
return n * k / q;
}
///
/// Calculate n*k/q
///
/// \param[in] n Number
/// \param[in] k Numerator
/// \param[in] q Denominator
///
/// \return n*k/q
///
inline constexpr uint64_t muldiv(uint64_t n, uint64_t k, uint64_t q)
{
return n * k / q;
}
} }