> What one would probably like to do is 1000000000 * val.QuadPart / freq.QuadPart in pure integer arithmetic, but the first bit will overflow quite soon. ...
While it is likely not practical atm., as a note for the future both GCC and MSVC provide 128-bit integer math on at least x86_64 (but not x86).
GCC >= 4.6 provides a new type '__int128'. https://gcc.gnu.org/onlinedocs/gcc/_005f_005fint128.html
MSVC >= 2019 through a set of intrinsic functions operating on a pair of 64-bit integers. eg. https://docs.microsoft.com/en-us/cpp/intrinsics/div128?view=vs-2019
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