5.4. Lw, Sw Load And Store Instructions
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1/3/2019 5.4. lw, sw: Load and store instructions 5.4 lw, sw: Load and store instructions Load instruction: lw A load instruction copies data from memory into a register. A MIPS load instruction format is shown below. Another sectio reason for the 0( ) around the memory-address. lw register 0(memory-address) MIPS register names start with a $. MIPSzy supports 8 registers. Writeable registers are $t0, $t1, ..., $t6. A special $zero reg the value 0 and can only be read, not written. The load instruction's memory-address is a register whose value is the memory address from which data is copied. Load word lw is short for "load word", in contrast to just loading a byte (a word is four bytes) PARTICIPATION ACTIVITY 5.4.1: Load instruction: lw. 1) If $t6's value is 2020, what is the memory address for the following instruction? lw $t0, 0($t6) Check Show answer https://learn.zybooks.com/zybook/FIUCDA3103CickovskiFall2018/chapter/5/section/4 1/6 1/3/2019 5.4. lw, sw: Load and store instructions 2) Given the following register le and memory contents, what value is loaded into register $t3 by the following instruction? lw $t3, 0($t6) Check Show answer 3) Given the following register le, complete the load instruction to load register $t2 with data at memory address 5012. https://learn.zybooks.com/zybook/FIUCDA3103CickovskiFall2018/chapter/5/section/4 2/6 1/3/2019 5.4. lw, sw: Load and store instructions lw $t2, 0( Check ) Show answer 4) Assuming $t5 holds 6000, write a load instruction that loads register $t4 with data at memory address 6000. Check Show answer Store instruction: sw A store instruction copies data from a register to memory. A MIPS store instruction format is shown below. Another sectio reason for the 0( ) around the memory-address. sw register 0(memory-address) PARTICIPATION ACTIVITY 5.4.2: Store instruction: sw. 1) Assuming $t6 holds 600 and $t0 holds 5008, what is the memory address for https://learn.zybooks.com/zybook/FIUCDA3103CickovskiFall2018/chapter/5/section/4 3/6 1/3/2019 5.4. lw, sw: Load and store instructions the following instruction? sw $t6, 0($t0) Check Show answer 2) Given $t2 holds 6200, $t3 holds 536, and $t4 holds 616, what value is stored into memory? sw $t3, 0($t2) Check Show answer 3) Given the following register le, complete the store instruction to store register $t2's value into memory at address 5000. sw , 0($t4) Check Show answer https://learn.zybooks.com/zybook/FIUCDA3103CickovskiFall2018/chapter/5/section/4 4/6 1/3/2019 Check 5.4. lw, sw: Load and store instructions Show answer 4) Assuming $t0 holds 5400 and $t1 holds 280, write a store instruction that stores register $t1's value into memory at address 5400. Check Show answer Instruction format summary: lw, sw The condensed instruction format below speci es all registers using $ followed by a single character. Ex: $a. Table 5.4.1: Instruction summary: lw, sw. Instruction Format Description Example lw lw $a, 0($b) Load word: Copies data from memory at address $b to register $a. lw $t3, 0($t6) sw sw $a, 0($b) Store word: Copies data from register $a to memory at address $b. sw $t1, 0($t3) CHALLENGE ACTIVITY 5.4.1: Load and store instructions. Start Compute: $t6 = DM[5192] https://learn.zybooks.com/zybook/FIUCDA3103CickovskiFall2018/chapter/5/section/4 1 2 5/6 1/3/2019 5.4. lw, sw: Load and store instructions lw $t5 , 0( $t5 Registers ) 5192 0 $t5 $t6 1 Check 2 Data memory 8 5192 3 3 Next Provide feedback on this section https://learn.zybooks.com/zybook/FIUCDA3103CickovskiFall2018/chapter/5/section/4 6/6
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