diff options
Diffstat (limited to 'Eigen/src/Core/arch/SSE')
| -rw-r--r-- | Eigen/src/Core/arch/SSE/MathFunctions.h | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/Eigen/src/Core/arch/SSE/MathFunctions.h b/Eigen/src/Core/arch/SSE/MathFunctions.h index 2d7df2f7b..9f66d8ab3 100644 --- a/Eigen/src/Core/arch/SSE/MathFunctions.h +++ b/Eigen/src/Core/arch/SSE/MathFunctions.h @@ -86,17 +86,17 @@ Packet4f pcos<Packet4f>(const Packet4f& _x) template<> EIGEN_DEFINE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS EIGEN_UNUSED Packet4f psqrt<Packet4f>(const Packet4f& _x) { - Packet4f half = pmul(_x, pset1<Packet4f>(.5f)); - Packet4f denormal_mask = _mm_and_ps( - _mm_cmpge_ps(_x, _mm_setzero_ps()), - _mm_cmplt_ps(_x, pset1<Packet4f>((std::numeric_limits<float>::min)()))); + Packet4f minus_half_x = pmul(_x, pset1<Packet4f>(-0.5f)); + Packet4f denormal_mask = pandnot( + pcmp_lt(_x, pset1<Packet4f>((std::numeric_limits<float>::min)())), + pcmp_lt(_x, pzero(_x))); // Compute approximate reciprocal sqrt. Packet4f x = _mm_rsqrt_ps(_x); // Do a single step of Newton's iteration. - x = pmul(x, psub(pset1<Packet4f>(1.5f), pmul(half, pmul(x,x)))); + x = pmul(x, pmadd(minus_half_x, pmul(x,x), pset1<Packet4f>(1.5f))); // Flush results for denormals to zero. - return _mm_andnot_ps(denormal_mask, pmul(_x,x)); + return pandnot(pmul(_x,x), denormal_mask); } #else |