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Avoid using uninitialized inputs and if available, use slightly more efficient movsd instruction for pset1<Packet2cf>.

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This commit is contained in:
Christoph Hertzberg 2021-04-13 00:52:30 +02:00
parent a2c0542010
commit 9357feedc7
1 changed files with 5 additions and 11 deletions
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16
Eigen/src/Core/arch/SSE/Complex.h
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@ -113,19 +113,13 @@ template<> EIGEN_STRONG_INLINE Packet2cf ploadu<Packet2cf>(const std::complex<fl
template<> EIGEN_STRONG_INLINE Packet2cf pset1<Packet2cf>(const std::complex<float>& from) template<> EIGEN_STRONG_INLINE Packet2cf pset1<Packet2cf>(const std::complex<float>& from)
{ {
Packet2cf res; Packet2cf res;
#if EIGEN_GNUC_AT_MOST(4,2) #ifdef EIGEN_VECTORIZE_SSE3
// Workaround annoying "may be used uninitialized in this function" warning with gcc 4.2 res.v = _mm_castpd_ps(_mm_loaddup_pd(reinterpret_cast<double const*>(&from)));
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
#else #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 #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); } template<> EIGEN_STRONG_INLINE Packet2cf ploaddup<Packet2cf>(const std::complex<float>* from) { return pset1<Packet2cf>(*from); }