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Remove useless register keyword, and optimize predux_min/max for SSE4

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Gael Guennebaud
2014-01-25 16:54:13 +01:00
parent 6cf938df53
commit a7621809fe
2 changed files with 17 additions and 7 deletions
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18
Eigen/src/Core/arch/SSE/PacketMath.h
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@@ -504,13 +504,18 @@ template<> EIGEN_STRONG_INLINE double predux_min<Packet2d>(const Packet2d& a)
}
template<> EIGEN_STRONG_INLINE int predux_min<Packet4i>(const Packet4i& a)
{
#ifdef EIGEN_VECTORIZE_SSE4_1
Packet4i tmp = _mm_min_epi32(a, _mm_shuffle_epi32(a, _MM_SHUFFLE(0,0,3,2)));
return pfirst(_mm_min_epi32(tmp,_mm_shuffle_epi32(tmp, 1)));
#else
// after some experiments, it is seems this is the fastest way to implement it
// for GCC (eg., it does not like using std::min after the pstore !!)
EIGEN_ALIGN16 int aux[4];
pstore(aux, a);
register int aux0 = aux[0]<aux[1] ? aux[0] : aux[1];
register int aux2 = aux[2]<aux[3] ? aux[2] : aux[3];
int aux0 = aux[0]<aux[1] ? aux[0] : aux[1];
int aux2 = aux[2]<aux[3] ? aux[2] : aux[3];
return aux0<aux2 ? aux0 : aux2;
#endif // EIGEN_VECTORIZE_SSE4_1
}
// max
@@ -525,13 +530,18 @@ template<> EIGEN_STRONG_INLINE double predux_max<Packet2d>(const Packet2d& a)
}
template<> EIGEN_STRONG_INLINE int predux_max<Packet4i>(const Packet4i& a)
{
#ifdef EIGEN_VECTORIZE_SSE4_1
Packet4i tmp = _mm_max_epi32(a, _mm_shuffle_epi32(a, _MM_SHUFFLE(0,0,3,2)));
return pfirst(_mm_max_epi32(tmp,_mm_shuffle_epi32(tmp, 1)));
#else
// after some experiments, it is seems this is the fastest way to implement it
// for GCC (eg., it does not like using std::min after the pstore !!)
EIGEN_ALIGN16 int aux[4];
pstore(aux, a);
register int aux0 = aux[0]>aux[1] ? aux[0] : aux[1];
register int aux2 = aux[2]>aux[3] ? aux[2] : aux[3];
int aux0 = aux[0]>aux[1] ? aux[0] : aux[1];
int aux2 = aux[2]>aux[3] ? aux[2] : aux[3];
return aux0>aux2 ? aux0 : aux2;
#endif // EIGEN_VECTORIZE_SSE4_1
}
#if (defined __GNUC__)