Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Fix asinh of negative values #72486

Merged
merged 2 commits into from
Jun 19, 2020
Merged

Fix asinh of negative values #72486

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
730f736
Fix asinh of negative values
Ralith May 23, 2020
35a2915
Remove now-redundant branch
Ralith Jun 19, 2020
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
8 changes: 3 additions & 5 deletions src/libstd/f32.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -832,11 +832,7 @@ impl f32 {
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn asinh(self) -> f32 {
if self == Self::NEG_INFINITY {
Self::NEG_INFINITY
} else {
(self + ((self * self) + 1.0).sqrt()).ln().copysign(self)
}
(self.abs() + ((self * self) + 1.0).sqrt()).ln().copysign(self)
}

/// Inverse hyperbolic cosine function.
Expand Down Expand Up @@ -1414,6 +1410,8 @@ mod tests {
assert!((-0.0f32).asinh().is_sign_negative()); // issue 63271
assert_approx_eq!(2.0f32.asinh(), 1.443635475178810342493276740273105f32);
assert_approx_eq!((-2.0f32).asinh(), -1.443635475178810342493276740273105f32);
// regression test for the catastrophic cancellation fixed in 72486
assert_approx_eq!((-3000.0f32).asinh(), -8.699514775987968673236893537700647f32);
}

#[test]
Expand Down
8 changes: 3 additions & 5 deletions src/libstd/f64.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -834,11 +834,7 @@ impl f64 {
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn asinh(self) -> f64 {
if self == Self::NEG_INFINITY {
Self::NEG_INFINITY
} else {
(self + ((self * self) + 1.0).sqrt()).ln().copysign(self)
}
(self.abs() + ((self * self) + 1.0).sqrt()).ln().copysign(self)
}

/// Inverse hyperbolic cosine function.
Expand Down Expand Up @@ -1443,6 +1439,8 @@ mod tests {
// issue 63271
assert_approx_eq!(2.0f64.asinh(), 1.443635475178810342493276740273105f64);
assert_approx_eq!((-2.0f64).asinh(), -1.443635475178810342493276740273105f64);
// regression test for the catastrophic cancellation fixed in 72486
assert_approx_eq!((-67452098.07139316f64).asinh(), -18.72007542627454439398548429400083);
}

#[test]
Expand Down