Eigen是有关线性代数（矩阵、向量等）的c++模板库。支持SSE2/3/4,ARM
NEON (32-bit and 64-bit), PowerPC AltiVec/VSX (32-bit and 64-bit) instruction sets, S390x SIMD (ZVector).x86使用-msse2编译选项 x86-64默认支持SSE2 32-bit ARM NEON使用-mfpu=neon -mfloat-abi=softfp|hard 64-bit ARM SIMD默认支持 http://blog.csdn.net/xmdxcsj/article/details/52643891 On GCC and clang you can simply pass
-march=native to let the compiler enables
all instruction set that are supported by your CPU. n 32-bit ARM NEON, the following:
-mfpu=neon -mfloat-abi=softfp|hard, depending
if you are on a softfp/hardfp system. Most current distributions are using a hard floating-point ABI, so go for the latter, or just leave the default and just pass
-mfpu=neon. Make sure the
EIGEN_DONT_VECTORIZE preprocessor symbol not defined. -mfloat-abi=softfp的问题，指定fpu为neon
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