• Instructions that require three operands: 2 registers and a D(B) address

• Format: label STM R₁,R₂,D(B)

• stores all registers from R₁ through R₂ in contiguous fullwords starting at D(B)

• if R₂ is less than R₁, then R₁ through register 15 and register 0 through R₂ are stored

STM   R4,R7,SAVE => stores registers 4, 5, 6, and 7 in 4 fullwords starting at SAVE

STM   R14,R2,SAVE2 => stores registers 14, 15, 0, 1, and 2 in 5 fullwords starting at SAVE2

• Format: label LM R₁,R₂,D(B)

• loads all registers from R₁ through R₂ from contiguous fullwords starting at D(B)

• if R₂ is less than R₁, then R₁ through register 15 and register 0 through R₂ are loaded

LM   R4,R7,SAVE => loads registers 4, 5, 6, and 7 from 4 fullwords starting at SAVE

LM   R14,R2,SAVE2 => loads registers 14, 15, 0, 1, and 2 from 5 fullwords starting at SAVE2