Eigen/src/Core/products/GeneralMatrixVector.h 294: if ((size_t(lhs0+alignedStart)%sizeof(LhsPacket))==0) for (Index i = alignedStart;i<alignedSize;i+=ResPacketSize) pstore(&res[i], pcj.pmadd(ploadu<LhsPacket>(&lhs0[i]), ptmp0, pload<ResPacket>(&res[i]))); else for (Index i = alignedStart;i<alignedSize;i+=ResPacketSize) pstore(&res[i], pcj.pmadd(ploadu<LhsPacket>(&lhs0[i]), ptmp0, pload<ResPacket>(&res[i]))); after this commit https://bitbucket.org/eigen/eigen/commits/38fe6a9428cb9e36dbc3b032660e1ac64bf29180
I am sorry that no written details. Before that commit: if ((size_t(lhs0+alignedStart)%sizeof(LhsPacket))==0) for (Index j = alignedStart;j<alignedSize;j+=ResPacketSize) ei_pstore(&res[j], pcj.pmadd(ei_pload<LhsPacket>(&lhs0[j]), ptmp0, ... <=== ^ after: ei_pstore(&res[i], pcj.pmadd(ei_ploadu<LhsPacket>(&lhs0[i]), ptmp0, ... ^
Fixed in default and 3.2. Thanks for the report. It was clear from the first description, but we did not consider this very urgent. Basically, it only caused a small overhead. Unfortunately, those regressions are not caught by unit-tests. https://bitbucket.org/eigen/eigen/commits/abccf5aa84bcf8a3e32e13c4701c11b4bcde89c4
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