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swr

Store word right (unaligned)

Stores the low-order 1 to 4 bytes of $t1 from the start of a word up to an unaligned address.

Forms

  • swr , ()

Pseudo-instructions

The assembler turns these into one or more real instructions.

Store low-order 1 to 4 bytes of $t1 into memory, starting with high-order byte of word containing effective memory byte address and continuing through that byte address

Operands

$t1
Any general-purpose register, $0 to $31, using its numeric or named spelling, such as $8 or $t0 ($zero is $0; $ra is $31).
imm16
A signed 16-bit immediate, -32768 to 32767.
$t2
A general-purpose register. It may be the same register as $t1.
imm
An immediate value: a signed 16-bit value (-32768 to 32767), an unsigned 16-bit value (0 to 65535) or a 32-bit value (-2147483648 to 4294967295). The assembler chooses a supported encoding for the value and other operands; a pseudoinstruction may expand into several instructions.
label
A named address in the program, such as the start of a loop or a variable in .data.
imm32
A 32-bit immediate, -2147483648 to 4294967295. Pseudoinstruction expansion may overwrite $at, losing its previous value.

Use together with 'swl' to store a full word at an unaligned address.

.data
.align 2
data: .word 0xAABBCCDD
.text
# Store word 0x12345678 with swr at offset 1; the initial bytes are AABBCCDD. Inspect data bytes: [0xDD, 0x78, 0x56, 0x34].
la $t1, data
li $t0, 0x12345678
swr $t0, 1($t1)