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Bitwise Operations exist in programming languages as a direct way to modify the binary values, or bits, in a number. Sometimes, it's more efficient or useful to modify the bits of a number rather than performing arithmetic on the number. One example of this is a bitmask where you use the BAND operation to choose several bits to check and ignore the others.

Pico8 has a collection of useful bitwise operations. Keep in mind that, since update 0.2.0 when they were added, the operator forms of the bitwise functions run faster in the simulated CPU than the API Calls do.

Operation Name API Call Operator Description
Bitwise Not BNOT(A) ~ A Inverts all of the bits of the number. 0 swaps to 1 and 1 swaps to 0. (Invert)
Bitwise And BAND(A,B) A & B Compares the numbers at each bit position. If the bits are both 1, the result is 1, otherwise if a 1 is compared to a 0, the 0 replaces it.. (Zero-dominant)
Bitwise Or BOR(A,B) A | B Compares the numbers at each bit position. If the bits are both 0, the result is 0, but if a 0 is compared to a 1, the 1 replaces it. (One-dominant)
Bitwise Exclusive Or BXOR(A,B) A ^^ B Compares the numbers at each bit position. If the bits are the same, the result for that position is a 0, but if a 0 is compared to a 1, the bit is "Exclusively" in only one input, and the result is a 1. (There can be Exclusively One)
Arithmetic Shift Left SHL(A,B) A << B Shifts each bit of a number left by B positions.
Arithmetic Shift Right SHR(A,B) A >> B Shifts each bit of a number right by B positions. Arithmetic shift attempts to preserve the sign (Positive or negative) of the number by copying the sign bit (farthest left) into the resulting empty positions.
Logical Shift Right LSHR(A,B) A >>> B Shifts each bit of a number right by B positions. Logical shift ignores the sign of a number, filling zeroes into the space left over by the shift.
Rotate Left ROTL(A,B) A <<> B Rotates each bit of a number left by B positions. In a rotation, bits which "fall off" on the left-hand side are wrapped around to the right of the number.
Rotate Right ROTR(A,B) A >>< B Rotates each bit of a number right by B positions. In the rotation, bits which "fall off" on the right-hand side are wrapped around to the left of the number.

See also Edit

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