fix auto detect of sve length #372

Job	Run time
CMake Matrix Test. (Linux Min GCC, ubuntu-20.04, gcc-9, g++-9, 3.8, 3.19.x, ON, OFF, static)	16m 3s
CMake Matrix Test. (Linux Min GCC, ubuntu-20.04, gcc-9, g++-9, 3.8, 3.19.x, ON, OFF, shared)	12m 7s
CMake Matrix Test. (Linux Min Clang, ubuntu-20.04, clang-9, clang++-9, 3.8, 3.19.x, ON, OFF, static)	11m 22s
CMake Matrix Test. (Linux Min Clang, ubuntu-20.04, clang-9, clang++-9, 3.8, 3.19.x, ON, OFF, shared)	6m 16s
CMake Matrix Test. (MacOS Min, macos-11, clang, clang++, 3.8, 3.19.x, ON, OFF, static)	41m 28s
CMake Matrix Test. (MacOS Min, macos-11, clang, clang++, 3.8, 3.19.x, ON, OFF, shared)	46m 29s
CMake Matrix Test. (Linux Max GCC, ubuntu-22.04, gcc-12, g++-12, 3.11, 3.22.x, ON, OFF, static)	16m 43s
CMake Matrix Test. (Linux Max GCC, ubuntu-22.04, gcc-12, g++-12, 3.11, 3.22.x, ON, OFF, shared)	12m 25s
CMake Matrix Test. (Linux SIMD, ubuntu-22.04, gcc-12, g++-12, 3.11, 3.22.x, OFF, ON, static)	16m 13s
CMake Matrix Test. (Linux SIMD, ubuntu-22.04, gcc-12, g++-12, 3.11, 3.22.x, OFF, ON, shared)	13m 15s
CMake Matrix Test. (Linux Max Clang, ubuntu-22.04, clang-14, clang++-14, 3.11, 3.22.x, ON, OFF, s...	16m 16s
CMake Matrix Test. (Linux Max Clang, ubuntu-22.04, clang-14, clang++-14, 3.11, 3.22.x, ON, OFF, s...	13m 2s
CMake Matrix Test. (MacOS Max, macos-13, clang, clang++, 3.11, 3.22.x, ON, OFF, static)	21m 14s
CMake Matrix Test. (MacOS Max, macos-13, clang, clang++, 3.11, 3.22.x, ON, OFF, shared)	22m 34s
	4h 25m 27s

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