Avoid using uninitialized inputs and if available, use slightly more efficient `movsd` instruction for `pset1<Packet2cf>`.
diff --git a/Eigen/src/Core/arch/SSE/Complex.h b/Eigen/src/Core/arch/SSE/Complex.h
index f6f1b8c..b1edfa4 100644
--- a/Eigen/src/Core/arch/SSE/Complex.h
+++ b/Eigen/src/Core/arch/SSE/Complex.h
@@ -113,19 +113,13 @@
template<> EIGEN_STRONG_INLINE Packet2cf pset1<Packet2cf>(const std::complex<float>& from)
{
Packet2cf res;
-#if EIGEN_GNUC_AT_MOST(4,2)
- // Workaround annoying "may be used uninitialized in this function" warning with gcc 4.2
- res.v = _mm_loadl_pi(_mm_set1_ps(0.0f), reinterpret_cast<const __m64*>(&from));
-#elif EIGEN_GNUC_AT_LEAST(4,6)
- // Suppress annoying "may be used uninitialized in this function" warning with gcc >= 4.6
- #pragma GCC diagnostic push
- #pragma GCC diagnostic ignored "-Wuninitialized"
- res.v = _mm_loadl_pi(res.v, (const __m64*)&from);
- #pragma GCC diagnostic pop
+#ifdef EIGEN_VECTORIZE_SSE3
+ res.v = _mm_castpd_ps(_mm_loaddup_pd(reinterpret_cast<double const*>(&from)));
#else
- res.v = _mm_loadl_pi(res.v, (const __m64*)&from);
+ res.v = _mm_castpd_ps(_mm_load_sd(reinterpret_cast<double const*>(&from)));
+ res.v = _mm_movelh_ps(res.v, res.v);
#endif
- return Packet2cf(_mm_movelh_ps(res.v,res.v));
+ return res;
}
template<> EIGEN_STRONG_INLINE Packet2cf ploaddup<Packet2cf>(const std::complex<float>* from) { return pset1<Packet2cf>(*from); }
