Contents
Arithmetic InstructionsEdit
These are the basic operations used for addition, subtraction, and multiplication. Note that any of these arithmetic instructions may take a register or an immediate value as the op2 parameter. All other parameters (rd and rs1 must be registers).
Instruction:


Adds rs1 and op2, and stores result in rd.
Instruction:


Same as above, except that it sets the condition codes.
Instruction:


subtracts op2 from rs1, and stores the difference in rd
Instruction:


same as above, except that it sets the condition codes.
Instruction:


Performs a single step in the multiplication operation. Stores partial results in register Y. Complete multiplication algorithms are discussed in more detail later.
Extended PrecisionEdit
These instructions account for the carry bit setting, so that large numbers (larger then the machine word) can be virtually manipulated as a single entity.
Instruction:


Performs extended addition (adds two operands and carry bit), and stores result in rd.
Instruction:


Same as above, but sets the condition codes.
Instruction:


Performs extended subtractions (subtracts op2 and C from rs1) and stores result in rd.
Instruction:


same as above, but sets the condition codes.
Tagged InstructionsEdit
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Y RegisterEdit
These operations affect the Y register.
Instruction:


reads the contents of the Y register in to the rd destination register
Instruction:


exclusively ORs the rs1 and op2 values, and stores that result in the Y register.
Logic InstructionsEdit
Instruction:


performs the bitwise AND of rs1 and op2, and stores the result in rd.
Instruction:


same as above, sets the condition codes.
Instruction:


performs the bitwise OR of rs1 and op2, and stores the result in rd.
Instruction:


same as above, sets the condition codes.
Instruction:


performs the bitwise XOR, between rs1 and op2. stores the result in rd.
Instruction:


same as above, sets the condition codes.
Instruction:


performs the bitwise XNOR between rs1 and op2. puts result in rd.
Instruction:


same as above, sets condition codes.
Inverted Logic OperationsEdit
Instruction:


ANDs rs1 and the bitwise inverse of op2. stores result in rd.
Instruction:


same as above, sets condition codes.
Instruction:


ORs rs1 and the bitwise inverse of op2. stores the result in rd.
Instruction:


same as above, sets the condition codes.
Shift InstructionsEdit
Instruction:


performs the logical leftshift of rs1. Shift amount is according to value of op2. result is stored in rd.
Instruction:


performs the logical rightshift of rs1. Shift amount is the value of op2. stores the result into rd.
Instruction:


performs the arithmetic rightshft of rs1. shift amount is the value of op2. stores the result in rd.