Instruction Syntax

Mnemonic	Format	Flags
and	rA,rS,rB	Rc = 0
and.	rA,rS,rB	Rc = 1

Instruction Encoding

Field	Bits	Description
Primary Opcode	0-5	011111 (0x1F)
rS	6-10	Source register S
rA	11-15	Destination register A
rB	16-20	Source register B
Reserved	21	Should be zero
XO	22-29	28 (Extended opcode)
Rc	30-31	Record Condition Register

Operation

rA ← (rS) & (rB)

The bitwise AND of the contents of rS and rB is placed into rA.

Note: This instruction performs a bitwise logical AND operation on each bit position.

Affected Registers

Condition Register (CR0 field)

(if Rc = 1)

• LT (Less Than)
• GT (Greater Than)
• EQ (Equal)
• SO (Summary Overflow)

For more information on condition codes see Section 2.1.3, "Condition Register," in the PowerPC Microprocessor Family: The Programming Environments manual.

Examples

Basic Logical AND

and r3, r1, r2     # r3 = r1 & r2
and. r3, r1, r2    # Same as above, but also sets condition register

Bit Masking

# Clear specific bits using mask
li r4, 0x00FF      # Load mask to keep lower 8 bits
and r3, r1, r4     # Keep only lower 8 bits of r1

Clear High Bits

# Clear upper 16 bits
lis r4, 0x0000     # Load 0x00000000 into upper 16 bits
ori r4, r4, 0xFFFF # Set lower 16 bits to 1
and r3, r1, r4     # r3 = r1 & 0x0000FFFF

Test Bit Pattern

# Test if specific bits are set
li r4, 0x8000      # Test bit 0 (sign bit)
and. r3, r1, r4    # Test and set condition codes
beq bit_clear      # Branch if bit was clear

Copy Register

# Copy register using AND with all 1s
li r4, -1          # Load 0xFFFFFFFF
and r3, r1, r4     # r3 = r1 (copy operation)

Related Instructions

andc, andi., andis., or, xor, nand