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* add bench/benchVecAdd.cpp by Gael, fix crash (ei_pload on non-aligned)

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* introduce packet(int), make use of it in linear vectorized paths
  --> completely fixes the slowdown noticed in benchVecAdd.
* generalize coeff(int) to linear-access xprs
* clarify the access flag bits
* rework api dox in Coeffs.h and util/Constants.h
* improve certain expressions's flags, allowing more vectorization
* fix bug in Block: start(int) and end(int) returned dyn*dyn size
* fix bug in Block: just because the Eval type has packet access
  doesn't imply the block xpr should have it too.
This commit is contained in:
Benoit Jacob
2008-06-26 16:06:41 +00:00
parent 5b0da4b778
commit 25ba9f377c
23 changed files with 558 additions and 264 deletions
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25
Eigen/src/Core/Dot.h
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@@ -175,27 +175,20 @@ struct ei_dot_impl<Derived1, Derived2, LinearVectorization, NoUnrolling>
const int size = v1.size();
const int packetSize = ei_packet_traits<Scalar>::size;
const int alignedSize = (size/packetSize)*packetSize;
const bool rowVector1 = Derived1::RowsAtCompileTime == 1;
const bool rowVector2 = Derived2::RowsAtCompileTime == 1;
Scalar res;
// do the vectorizable part of the sum
if(size >= packetSize)
{
PacketScalar packet_res;
packet_res = ei_pmul(
v1.template packet<Aligned>(0, 0),
v2.template packet<Aligned>(0, 0)
);
PacketScalar packet_res = ei_pmul(
v1.template packet<Aligned>(0),
v2.template packet<Aligned>(0)
);
for(int index = packetSize; index<alignedSize; index += packetSize)
{
const int row1 = rowVector1 ? 0 : index;
const int col1 = rowVector1 ? index : 0;
const int row2 = rowVector2 ? 0 : index;
const int col2 = rowVector2 ? index : 0;
packet_res = ei_pmadd(
v1.template packet<Aligned>(row1, col1),
v2.template packet<Aligned>(row2, col2),
v1.template packet<Aligned>(index),
v2.template packet<Aligned>(index),
packet_res
);
}
@@ -213,11 +206,7 @@ struct ei_dot_impl<Derived1, Derived2, LinearVectorization, NoUnrolling>
// do the remainder of the vector
for(int index = alignedSize; index < size; index++)
{
const int row1 = rowVector1 ? 0 : index;
const int col1 = rowVector1 ? index : 0;
const int row2 = rowVector2 ? 0 : index;
const int col2 = rowVector2 ? index : 0;
res += v1.coeff(row1, col1) * v2.coeff(row2, col2);
res += v1.coeff(index) * v2.coeff(index);
}
return res;