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5ca10480b0
See <https://stackoverflow.com/questions/59709148/ensuring-that-eigen-uses-avx-vectorization-for-a-certain-operation> for an explanation of the problem this solves. In short, for some reason, before this commit the half-packet is selected when the array / matrix size is not a multiple of `unpacket_traits<PacketType>::size`, where `PacketType` starts out being the full Packet. For example, for some data of 100 `float`s, `Packet4f` will be selected rather than `Packet8f`, because 100 is not a multiple of 8, the size of `Packet8f`. This commit switches to selecting the half-packet if the size is less than the packet size, which seems to make more sense. As I stated in the SO post I'm not sure that I'm understanding the issue correctly, but this fix resolves the issue in my program. Moreover, `make check` passes, with the exception of line 614 and 616 in `test/packetmath.cpp`, which however also fail on master on my machine: CHECK_CWISE1_IF(PacketTraits::HasBessel, numext::bessel_i0, internal::pbessel_i0); ... CHECK_CWISE1_IF(PacketTraits::HasBessel, numext::bessel_i1, internal::pbessel_i1); |
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| bench | ||
| blas | ||
| cmake | ||
| debug | ||
| demos | ||
| doc | ||
| Eigen | ||
| failtest | ||
| lapack | ||
| scripts | ||
| test | ||
| unsupported | ||
| .gitignore | ||
| .hgeol | ||
| CMakeLists.txt | ||
| COPYING.BSD | ||
| COPYING.GPL | ||
| COPYING.LGPL | ||
| COPYING.MINPACK | ||
| COPYING.MPL2 | ||
| COPYING.README | ||
| CTestConfig.cmake | ||
| CTestCustom.cmake.in | ||
| eigen3.pc.in | ||
| INSTALL | ||
| README.md | ||
| signature_of_eigen3_matrix_library | ||
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
For more information go to http://eigen.tuxfamily.org/.
For pull request, bug reports, and feature requests, go to https://gitlab.com/libeigen/eigen.