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* implement a second level of micro blocking (faster for small sizes)

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* workaround GCC bad implementation of _mm_set1_p*
This commit is contained in:
Gael Guennebaud
2009-08-07 11:09:34 +02:00
parent 543a785756
commit d1dc088ef0
3 changed files with 174 additions and 26 deletions
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15
Eigen/src/Core/arch/SSE/PacketMath.h
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@@ -74,8 +74,23 @@ template<> struct ei_unpacket_traits<Packet4f> { typedef float type; enum {size
template<> struct ei_unpacket_traits<Packet2d> { typedef double type; enum {size=2}; };
template<> struct ei_unpacket_traits<Packet4i> { typedef int type; enum {size=4}; };
#ifdef __GNUC__
// Sometimes GCC implements _mm_set1_p* using multiple moves,
// that is inefficient :(
template<> EIGEN_STRONG_INLINE Packet4f ei_pset1<float>(const float& from) {
Packet4f res = _mm_set_ss(from);
asm("shufps $0, %[x], %[x]" : [x] "+x" (res) : );
return res;
}
template<> EIGEN_STRONG_INLINE Packet2d ei_pset1<double>(const double& from) {
Packet2d res = _mm_set_sd(from);
asm("unpcklpd %[x], %[x]" : [x] "+x" (res) : );
return res;
}
#else
template<> EIGEN_STRONG_INLINE Packet4f ei_pset1<float>(const float& from) { return _mm_set1_ps(from); }
template<> EIGEN_STRONG_INLINE Packet2d ei_pset1<double>(const double& from) { return _mm_set1_pd(from); }
#endif
template<> EIGEN_STRONG_INLINE Packet4i ei_pset1<int>(const int& from) { return _mm_set1_epi32(from); }
template<> EIGEN_STRONG_INLINE Packet4f ei_padd<Packet4f>(const Packet4f& a, const Packet4f& b) { return _mm_add_ps(a,b); }