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Simplify atan2 expressions when y is non-zero

This commit is contained in:
Alex Herbert 2021-08-18 23:16:01 +01:00
parent 7cb883c54b
commit 56b7b12c2a
1 changed files with 5 additions and 25 deletions
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30
commons-math-legacy-core/src/main/java/org/apache/commons/math4/legacy/core/jdkmath/AccurateMath.java
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@ -2692,16 +2692,14 @@ public final class AccurateMath {
if (invx == 0) { // X is infinite
if (x > 0) {
return y; // return +/- 0.0
} else {
return copySign(Math.PI, y);
}
return copySign(Math.PI, y);
}
if (x < 0 || invx < 0) {
return copySign(Math.PI, y);
} else {
return x * y;
}
return x * y;
}
// y cannot now be zero
@ -2731,35 +2729,17 @@ public final class AccurateMath {
}
if (x == Double.POSITIVE_INFINITY) {
if (y > 0 || 1 / y > 0) {
return 0d;
}
if (y < 0 || 1 / y < 0) {
return -0d;
}
return y > 0 ? 0d : -0d;
}
if (x == Double.NEGATIVE_INFINITY) {
if (y > 0.0 || 1 / y > 0.0) {
return Math.PI;
}
if (y < 0 || 1 / y < 0) {
return -Math.PI;
}
return y > 0 ? Math.PI : -Math.PI;
}
// Neither y nor x can be infinite or NAN here
if (x == 0) {
if (y > 0 || 1 / y > 0) {
return Math.PI * F_1_2;
}
if (y < 0 || 1 / y < 0) {
return -Math.PI * F_1_2;
}
return y > 0 ? Math.PI * F_1_2 : -Math.PI * F_1_2;
}
// Compute ratio r = y/x