Radar ·
Signed 64-bit floor division by constants, made faster
Radar: an article by Ben Joffe describes a faster method for signed 64-bit floor division when the divisor is a constant. The page presents itself as the lost chapter of Hacker's Delight. Relevant to C and C++ compilers.
According to the Radar record, published on October 29, 2026, an article by Ben Joffe describes a faster method for computing signed 64-bit floor division when the divisor is a constant. The page presents itself as the lost chapter of Hacker's Delight. The source text gives no implementation details or performance figures, and this summary does not add them.
The stated relevance is C and C++ compilers and performance-sensitive code that divides by constants. Rota Nacional does not offer compiler optimization and does not solve this engineering problem. To verify, find the original article by its author and title, read the method, and test it against your own set of cases, including negative values and 64-bit limits. If you use AI to study the material, do not paste code containing personal data, e-mail addresses or credentials; replace them with placeholder markers.
Original source: Divisão piso com sinal de 64 bits por constantes, mais rápida