Nice. It seems gcc/clang don't know that trick. They still divide and then check...

pcordes on Aug 22, 2017 | parent | context | favorite | on: Why is this C++ code faster than my hand-written a...

Nice. It seems gcc/clang don't know that trick. They still divide and then check that x/3 * 3 == x. https://godbolt.org/g/V4kfuu. (So do ICC17 and MSVC CL19).