SPARC Assembly/Arithmetic Instructions

Arithmetic Instructions

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:

add

Adds rs1 and op2, and stores result in rd.

Instruction:

addcc

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

Instruction:

sub

subtracts op2 from rs1, and stores the difference in rd

Instruction:

subcc

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

Instruction:

mulcc

Performs a single step in the multiplication operation. Stores partial results in register Y. Complete multiplication algorithms are discussed in more detail later.

Extended Precision

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:

addx

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

Instruction:

addxcc

Same as above, but sets the condition codes.

Instruction:

subx

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

Instruction:

subxcc

same as above, but sets the condition codes.

Tagged Instructions

Instruction:

tsubcc

Instruction:

tsubcctv

Instruction:

taddcc

Instruction:

taddcctv

Y Register

These operations affect the Y register.

Instruction:

rdy

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

Instruction:

wry

exclusively ORs the rs1 and op2 values, and stores that result in the Y register.

Logic Instructions

Instruction:

and

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

Instruction:

andcc

same as above, sets the condition codes.

Instruction:

or

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

Instruction:

orcc

same as above, sets the condition codes.

Instruction:

xor

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

Instruction:

xorcc

same as above, sets the condition codes.

Instruction:

xnor

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

Instruction:

xnorcc

same as above, sets condition codes.

Inverted Logic Operations

Instruction:

andn

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

Instruction:

andncc

same as above, sets condition codes.

Instruction:

orn

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

Instruction:

orncc

same as above, sets the condition codes.

Shift Instructions

Instruction:

sll

performs the logical left-shift of rs1. Shift amount is according to value of op2. result is stored in rd.

Instruction:

srl

performs the logical right-shift of rs1. Shift amount is the value of op2. stores the result into rd.

Instruction:

sra

performs the arithmetic right-shft of rs1. shift amount is the value of op2. stores the result in rd.