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The ARM DS-5 5.20 compiler fails compiling with the following errors: "src/Core/arch/NEON/PacketMath.h", line 113: Error: #146: too many initializer values Packet4f countdown = EIGEN_INIT_NEON_PACKET4(0, 1, 2, 3); ^ "src/Core/arch/NEON/PacketMath.h", line 118: Error: #146: too many initializer values Packet4i countdown = EIGEN_INIT_NEON_PACKET4(0, 1, 2, 3); ^ "src/Core/arch/NEON/Complex.h", line 30: Error: #146: too many initializer values static uint32x4_t p4ui_CONJ_XOR = EIGEN_INIT_NEON_PACKET4(0x00000000, 0x80000000, 0x00000000, 0x80000000); ^ "src/Core/arch/NEON/Complex.h", line 31: Error: #146: too many initializer values static uint32x2_t p2ui_CONJ_XOR = EIGEN_INIT_NEON_PACKET2(0x00000000, 0x80000000); ^ The vectors are implemented as two doubles, hence the too many initializer values error. Changed the code to use intrinsic load functions which all compilers implementing NEON should have.