* split PacketMath.h to SSE and Altivec specific files

* improved the flexibility of the new product implementation,
  now all sizes seems to be properly handled.

Eigen/src/Core/PacketMath_Altivec.h

@@ -0,0 +1,113 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra. Eigen itself is part of the KDE project.
+//
+// Copyright (C) 2008 Gael Guennebaud <g.gael@free.fr>
+//
+// Eigen is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 3 of the License, or (at your option) any later version.
+//
+// Alternatively, you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of
+// the License, or (at your option) any later version.
+//
+// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License and a copy of the GNU General Public License along with
+// Eigen. If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef EIGEN_PACKET_MATH_ALTIVEC_H
+#define EIGEN_PACKET_MATH_ALTIVEC_H
+
+#ifndef EIGEN_VECTORIZE_ALTIVEC
+#error include PacketMath_Altivec without EIGEN_VECTORIZE_ALTIVEC
+#endif
+
+#ifdef EIGEN_CACHEFRIENDLY_PRODUCT_THRESHOLD
+#undef EIGEN_CACHEFRIENDLY_PRODUCT_THRESHOLD
+#define EIGEN_CACHEFRIENDLY_PRODUCT_THRESHOLD 4
+#endif
+
+static const vector int   v0i   = vec_splat_u32(0);
+static const vector int   v16i_ = vec_splat_u32(-16);
+static const vector float v0f   = (vector float) v0i;
+
+template<> struct ei_packet_traits<float>  { typedef vector float type; enum {size=4}; };
+template<> struct ei_packet_traits<int>    { typedef vector int type; enum {size=4}; };
+
+inline vector float  ei_padd(const vector float   a, const vector float   b) { return vec_add(a,b); }
+inline vector int    ei_padd(const vector int     a, const vector int     b) { return vec_add(a,b); }
+
+inline vector float  ei_psub(const vector float   a, const vector float   b) { return vec_sub(a,b); }
+inline vector int    ei_psub(const vector int     a, const vector int     b) { return vec_sub(a,b); }
+
+inline vector float  ei_pmul(const vector float   a, const vector float   b) { return vec_madd(a,b, v0f); }
+inline vector int    ei_pmul(const vector int     a, const vector int     b)
+{
+  // Taken from http://
+
+  //Set up constants
+  vector int bswap, lowProduct, highProduct;
+
+  //Do real work
+  bswap = vec_rl( (vector unsigned int)b, (vector unsigned int)v16i_ );
+  lowProduct = vec_mulo( (vector short)a,(vector short)b );
+  highProduct = vec_msum((vector short)a,(vector short)bswap, v0i);
+  highProduct = vec_sl( (vector unsigned int)highProduct, (vector unsigned int)v16i_ );
+  return vec_add( lowProduct, highProduct );
+}
+
+inline vector float ei_pmadd(const vector float   a, const vector float   b, const vector float c) { return vec_madd(a, b, c); }
+
+inline vector float  ei_pmin(const vector float   a, const vector float   b) { return vec_min(a,b); }
+inline vector int    ei_pmin(const vector int     a, const vector int     b) { return vec_min(a,b); }
+
+inline vector float  ei_pmax(const vector float   a, const vector float   b) { return vec_max(a,b); }
+inline vector int    ei_pmax(const vector int     a, const vector int     b) { return vec_max(a,b); }
+
+inline vector float  ei_pload(const float*   from) { return vec_ld(0, from); }
+inline vector int    ei_pload(const int*     from) { return vec_ld(0, from); }
+
+inline vector float  ei_pset1(const float&  from)
+{
+  static float __attribute__(aligned(16)) af[4];
+  af[0] = from;
+  vector float vc = vec_ld(0, af);
+  vc = vec_splat(vc, 0);
+  return vc;
+}
+
+inline vector int    ei_pset1(const int&    from)
+{
+  static int __attribute__(aligned(16)) ai[4];
+  ai[0] = from;
+  vector int vc = vec_ld(0, ai);
+  vc = vec_splat(vc, 0);
+  return vc;
+}
+
+inline void ei_pstore(float*   to, const vector float   from) { vec_st(from, 0, to); }
+inline void ei_pstore(int*     to, const vector int     from) { vec_st(from, 0, to); }
+
+inline float  ei_pfirst(const vector float  a)
+{
+  static float __attribute__(aligned(16)) af[4];
+  vec_st(a, 0, af);
+  return af[0];
+}
+
+inline int    ei_pfirst(const vector int    a)
+{
+  static int __attribute__(aligned(16)) ai[4];
+  vec_st(a, 0, ai);
+  return ai[0];
+}
+
+#endif // EIGEN_PACKET_MATH_ALTIVEC_H
+