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LibAudio: Prevent overflows during prediction

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Saturating arithmetic leads to less screwed up audio in these cases.
This commit is contained in:
kleines Filmröllchen 2023-08-19 20:01:37 +02:00 • committed by Andrew Kaster
parent 0347d04289
commit b432674923
2 changed files with 30 additions and 4 deletions
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26
AK/Checked.h
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@ -234,6 +234,24 @@ public:
m_overflow = false;
}
constexpr void saturating_mul(T other)
{
// Figure out if the result is positive, negative or zero beforehand.
auto either_is_zero = this->m_value == 0 || other == 0;
auto result_is_positive = (this->m_value > 0) == (other > 0);
mul(other);
if (m_overflow) {
if (either_is_zero)
m_value = 0;
else if (result_is_positive)
m_value = NumericLimits<T>::max();
else
m_value = NumericLimits<T>::min();
}
m_overflow = false;
}
constexpr Checked& operator+=(Checked const& other)
{
m_overflow |= other.m_overflow;
@ -354,6 +372,14 @@ public:
return checked.value();
}
template<typename U, typename V>
static constexpr T saturating_mul(U a, V b)
{
Checked checked { a };
checked.saturating_mul(b);
return checked.value();
}
template<typename U, typename V>
[[nodiscard]] static constexpr bool multiplication_would_overflow(U u, V v)
{