add script to compare perf. of different x86 level #47
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This PR slightly changes the CMake config such that we can manually assign the architecture we want to compile to, e.g.:
It also adds the
scripts/test_x86_levels.bash
file to automatically compile and benchmark the different x86-64 architectural levels (https://en.wikipedia.org/wiki/X86-64#Microarchitecture_levels).