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This fixes the static assertion complaining about double being used in place of long double. This happened on MIPS32, where double and long double have the same type representation. This can be simulated on x86 as well if we pass -mlong-double-64 to g++.
bug #1572: use c++11 atomic instead of volatile if c++11 is available, and disable multi-threaded GEMM on non-x86 without c++11.
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
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