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-rw-r--r--libcxx/include/complex2
1 files changed, 1 insertions, 1 deletions
diff --git a/libcxx/include/complex b/libcxx/include/complex
index 2943da1d775..565e1114a06 100644
--- a/libcxx/include/complex
+++ b/libcxx/include/complex
@@ -1399,7 +1399,7 @@ acos(const complex<_Tp>& __x)
}
if (isinf(__x.imag()))
return complex<_Tp>(__pi/_Tp(2), -__x.imag());
- if (__x.real() == 0)
+ if (__x.real() == 0 && (__x.imag() == 0 || isnan(__x.imag())))
return complex<_Tp>(__pi/_Tp(2), -__x.imag());
complex<_Tp> __z = log(__x + sqrt(pow(__x, _Tp(2)) - _Tp(1)));
if (signbit(__x.imag()))
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