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By 2027 change default setting to WITH_LIBDIVIDE=OFF in CMakeLists.txt #57

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kimwalisch opened this issue May 4, 2022 · 1 comment
Open

By 2027 change default setting to WITH_LIBDIVIDE=OFF in CMakeLists.txt #57

kimwalisch opened this issue May 4, 2022 · 1 comment

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@kimwalisch
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We currently use libdivide because integer division is very slow on most x64 CPUs. However integer division will likely become much faster in near future and then WITH_LIBDIVIDE=OFF is expected to improve primecount's performance. But carefully benchmark some large inputs e.g. 1e21 --AC -s.
@kimwalisch
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libdivide is now disabled by default (since primecount-7.11) for Apple Silicon CPUs on Apple OSes in CMakeLists.txt.

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@kimwalisch