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Add overflow check to tanh(complex) and reduce to finite answer. Fixes http://llvm.org/bugs/show_bug.cgi?id=13874

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llvm-svn: 164266
This commit is contained in:
Howard Hinnant 2012-09-19 23:51:47 +00:00
parent 38bfa0c529
commit c43826f003
2 changed files with 6 additions and 1 deletions
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6
libcxx/include/complex
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@ -1351,7 +1351,11 @@ tanh(const complex<_Tp>& __x)
_Tp __2r(_Tp(2) * __x.real());
_Tp __2i(_Tp(2) * __x.imag());
_Tp __d(cosh(__2r) + cos(__2i));
return complex<_Tp>(sinh(__2r)/__d, sin(__2i)/__d);
_Tp __2rsh(sinh(__2r));
if (isinf(__2rsh) && isinf(__d))
return complex<_Tp>(__2rsh > _Tp(0) ? _Tp(1) : _Tp(-1),
__2i > _Tp(0) ? _Tp(0) : _Tp(-0.));
return complex<_Tp>(__2rsh/__d, sin(__2i)/__d);
}
// asin

1
libcxx/test/numerics/complex.number/complex.transcendentals/tan.pass.cpp
View File

@ -30,6 +30,7 @@ void
test()
{
test(std::complex<T>(0, 0), std::complex<T>(0, 0));
test(std::complex<T>(10000, -10000), std::complex<T>(0, -1));
}
void test_edges()