sw
Store word
Stores the 32-bit value in $t1 at the address $t2 plus an offset; the address must be word-aligned.
Used in
- Loads, stores and immediatesMIPS assembly
- The stack and $spMIPS assembly
- jal, jr, and the course calling conventionMIPS assembly
- The bitmap display and keyboard registersMIPS assembly
- Exceptions and coprocessor 0MIPS assembly
- Variables in memory and constantsMIPS assembly
- Fill an array with a guarded counting loopMIPS assembly
- Stack arguments and a stack frameMIPS assembly
- Recursion: factorial and FibonacciMIPS assembly
- Bubble sortMIPS assembly
Forms
sw , ()
Pseudo-instructions
The assembler turns these into one or more real instructions.
-
Write to label's address, reached through the %hi already in $t2
Store $t1 contents into effective memory word address
-
Store $t1 contents into memory word at label's address
Operands
$t1- Any general-purpose register,
$0to$31, using its numeric or named spelling, such as$8or$t0($zerois$0;$rais$31). imm16- A signed 16-bit immediate,
-32768to32767. $t2- A general-purpose register. It may be the same register as
$t1. label- A named address in the program, such as the start of a loop or a variable in
.data. imm- An immediate value: a signed 16-bit value (
-32768to32767), an unsigned 16-bit value (0to65535) or a 32-bit value (-2147483648to4294967295). The assembler chooses a supported encoding for the value and other operands; a pseudoinstruction may expand into several instructions. imm32- A 32-bit immediate,
-2147483648to4294967295. Pseudoinstruction expansion may overwrite$at, losing its previous value.
The address must be word-aligned (divisible by 4). Example: 'sw $t0,0($sp)' stores a value at the top of the stack.
.data
.align 2
data: .word 0
.text
# Write initialized value 0x12345678 with sw; inspect data bytes after the instruction: [0x78, 0x56, 0x34, 0x12].
la $t1, data
li $t0, 0x12345678
sw $t0, 0($t1)