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bug #1652: implements a much more accurate version of vectorized sin/cos. This new version achieve same speed for SSE/AVX, and is slightly faster with FMA. Guarantees are as follows:

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- no FMA: 1ULP up to 3pi, 2ULP up to sin(25966) and cos(18838), fallback to std::sin/cos for larger inputs
  - FMA: 1ULP up to sin(117435.992) and cos(71476.0625), fallback to std::sin/cos for larger inputs
This commit is contained in:
Gael Guennebaud
2019-01-09 15:25:17 +01:00
parent e70ffef967
commit e6b217b8dd
5 changed files with 181 additions and 75 deletions
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10
Eigen/src/Core/arch/AVX/PacketMath.h
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@@ -575,6 +575,16 @@ template<> EIGEN_STRONG_INLINE double predux_max<Packet4d>(const Packet4d& a)
return pfirst(_mm256_max_pd(tmp, _mm256_shuffle_pd(tmp, tmp, 1)));
}
// not needed yet
// template<> EIGEN_STRONG_INLINE bool predux_all(const Packet8f& x)
// {
// return _mm256_movemask_ps(x)==0xFF;
// }
template<> EIGEN_STRONG_INLINE bool predux_any(const Packet8f& x)
{
return _mm256_movemask_ps(x)!=0;
}
template<int Offset>
struct palign_impl<Offset,Packet8f>