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7dedfd22b7
Similarly to the signed versions added in 4d6ad31, this adds a set of inline functions for overflow checks with unsigned integers, including uint16, uint32 and uint64. This relies on compiler built-in overflow checks by default if available. The behavior of unsigned integers is well-defined so the fallback implementations checks are simple for additions and subtractions. Multiplications avoid division-based checks which are expensive if possible, still this can happen for uint64 if 128-bit integers are not available. While on it, the code in common/int.h is reorganized to avoid too many duplicated comments. The new macros will be used in a follow-up patch. All thanks to Andres Freund for the input provided. Author: Fabien Coelho, Michael Paquier Discussion: https://postgr.es/m/20190830073423.GB2354@paquier.xyz