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4f923aa46c
The `atanhl` function is broken under Rosetta 2 with 80-bit long
doubles, which numpy uses to implement long double complex numbers. This
results in a test failure. Attempts were made to change the
implementation of things, but that just changed the breakage.
The following Swift program demonstrates the problem.
import Foundation
import Numerics
let x = Float80(1.00000000e-20)
let z = Complex(x)
print("X: \(x), Z: \(z)")
let x_atanh = Float80.atanh(x)
let z_atanh = Complex.atanh(z)
print("atanh:")
print("X: \(x_atanh), Z: \(z_atanh)")
let d = abs(x_atanh / z_atanh.real - 1)
print("d: \(d)")
On x86_64-darwin hardware, it prints the following:
X: 1e-20, Z: (1e-20, 0.0)
atanh:
X: 1e-20, Z: (1e-20, 0.0)
d: 0.0
On aarch64-darwin under Rosetta 2, it prints the following:
X: 1e-20, Z: (1e-20, 0.0)
atanh:
X: 1e-20, Z: (-1.0237493319595677839e-40, 0.0)
d: 9.7680161420558978584e+19
The latter is obviously incorrect. FB12656897 was submitted to Apple,
but even if this is fixed eventually, this derivation needs to build for
users (and Hydra) who aren’t on the latest version.
24 lines
898 B
Diff
24 lines
898 B
Diff
diff --git a/numpy/core/tests/test_umath.py b/numpy/core/tests/test_umath.py
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index 6951d41e4..eefe86ad4 100644
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--- a/numpy/core/tests/test_umath.py
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+++ b/numpy/core/tests/test_umath.py
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@@ -4180,7 +4180,17 @@ def test_against_cmath(self):
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)
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@pytest.mark.xfail(IS_MUSL, reason="gh23049")
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@pytest.mark.xfail(IS_WASM, reason="doesn't work")
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- @pytest.mark.parametrize('dtype', [np.complex64, np.complex_, np.longcomplex])
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+ @pytest.mark.parametrize('dtype', [
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+ np.complex64,
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+ np.complex_,
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+ pytest.param(
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+ np.longcomplex,
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+ marks=pytest.mark.skipif(
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+ sys.platform == "darwin" and platform.machine() == "x86_64",
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+ reason="doesn’t work under Rosetta 2",
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+ ),
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+ ),
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+ ])
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def test_loss_of_precision(self, dtype):
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"""Check loss of precision in complex arc* functions"""
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