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| author | Jing Yu <jingyu@google.com> | 2012-02-15 15:40:16 -0800 |
|---|---|---|
| committer | Jing Yu <jingyu@google.com> | 2012-02-15 15:40:16 -0800 |
| commit | 3f73d6ef90458b45bbbb33ef4c2b174d4662a22d (patch) | |
| tree | 1b5f0d96c51b51168b3713058a1b62e92f1136eb /gcc-4.6/libstdc++-v3/include/tr1/complex | |
| parent | d7030123e04baab5dbff9c9ee04c0de99bd9a774 (diff) | |
| download | toolchain_gcc-3f73d6ef90458b45bbbb33ef4c2b174d4662a22d.tar.gz toolchain_gcc-3f73d6ef90458b45bbbb33ef4c2b174d4662a22d.tar.bz2 toolchain_gcc-3f73d6ef90458b45bbbb33ef4c2b174d4662a22d.zip | |
Sync down FSF r184235@google/gcc-4_6_2-mobile branch
1) Get mostly new patches from FSF gcc-4.6 branch
2) Fix PR52129
3) Insert GNU-stack note for all ARM targets
Change-Id: I2b9926981210e517e4021242908074319a91d6bd
Diffstat (limited to 'gcc-4.6/libstdc++-v3/include/tr1/complex')
| -rw-r--r-- | gcc-4.6/libstdc++-v3/include/tr1/complex | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/gcc-4.6/libstdc++-v3/include/tr1/complex b/gcc-4.6/libstdc++-v3/include/tr1/complex index fc213b8f1..689ea167b 100644 --- a/gcc-4.6/libstdc++-v3/include/tr1/complex +++ b/gcc-4.6/libstdc++-v3/include/tr1/complex @@ -185,12 +185,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION std::complex<_Tp> __complex_acosh(const std::complex<_Tp>& __z) { - std::complex<_Tp> __t((__z.real() - __z.imag()) - * (__z.real() + __z.imag()) - _Tp(1.0), - _Tp(2.0) * __z.real() * __z.imag()); - __t = std::sqrt(__t); - - return std::log(__t + __z); + // Kahan's formula. + return _Tp(2.0) * std::log(std::sqrt(_Tp(0.5) * (__z + _Tp(1.0))) + + std::sqrt(_Tp(0.5) * (__z - _Tp(1.0)))); } #if _GLIBCXX_USE_C99_COMPLEX_TR1 |