Leap year check in three instructions

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hueffner.de – 1 May 25 A leap year check in three instructions How to test for leap years (until year 102499) in the proleptic Gregorian calendar with just three 32-bit instructions, with detailed explanation of the bit-level tricks. Bit twiddling / integer math dive. (To prove my nerd cred, I have to point out that this solution doesn’t explain/consider the Julian/Gregorian switch, but admittedly…

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