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AK+Everywhere: Add sincos and use it in some places

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Calculating sin and cos at once is quite a bit cheaper than calculating
them individually.
x87 has even a dedicated instruction for it: `fsincos`.
This commit is contained in:
Hendiadyoin1 2022-02-03 12:48:17 +01:00 • committed by Andreas Kling
parent 47fe911196
commit cd21e03225
6 changed files with 30 additions and 10 deletions
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10
Userland/Libraries/LibAudio/Sample.h
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@ -97,8 +97,10 @@ struct Sample {
double const pi_over_2 = AK::Pi<double> * 0.5;
double const root_over_2 = AK::sqrt(2.0) * 0.5;
double const angle = position * pi_over_2 * 0.5;
left *= root_over_2 * (AK::cos(angle) - AK::sin(angle));
right *= root_over_2 * (AK::cos(angle) + AK::sin(angle));
double s, c;
AK::sincos(angle, s, c);
left *= root_over_2 * (c - s);
right *= root_over_2 * (c + s);
return *this;
}
@ -116,7 +118,7 @@ struct Sample {
return *this;
}
constexpr Sample operator*(double const mult)
constexpr Sample operator*(double const mult) const
{
return { left * mult, right * mult };
}
@ -134,7 +136,7 @@ struct Sample {
return *this;
}
constexpr Sample operator+(Sample const& other)
constexpr Sample operator+(Sample const& other) const
{
return { left + other.left, right + other.right };
}