LibM: Add back ampsin() since it was still used by tan()

orospakr · Nov 3, 2019 · 4565b2d · 4565b2d
1 parent 1282b77
commit 4565b2d
Showing 1 changed file with 17 additions and 0 deletions.
diff --git a/Libraries/LibM/math.cpp b/Libraries/LibM/math.cpp
@@ -84,6 +84,23 @@ double tanh(double x)
  return (plusX - minusX) / (plusX + minusX);
 }
 
+double ampsin(double angle)
+{
+ double looped_angle = fmod(M_PI + angle, M_TAU) - M_PI;
+ double looped_angle_squared = looped_angle * looped_angle;
+
+ double quadratic_term;
+ if (looped_angle > 0) {
+ quadratic_term = -looped_angle_squared;
+ } else {
+ quadratic_term = looped_angle_squared;
+ }
+
+ double linear_term = M_PI * looped_angle;
+
+ return quadratic_term + linear_term;
+}
+
 double tan(double angle)
 {
  return ampsin(angle) / ampsin(M_PI_2 + angle);