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sd

Store doubleword Pseudo-instruction

Stores $t1 and the next register as a 64-bit doubleword at an address.

Forms

Store contents of $t1 and the next register to the 64 bits starting at effective memory word 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).
imm
An immediate value: a signed 16-bit value (-32768 to 32767) 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.
$t2
A general-purpose register. It may be the same register as $t1.
imm32
A 32-bit immediate, -2147483648 to 4294967295. Pseudoinstruction expansion may overwrite $at, losing its previous value.
label
A named address in the program, such as the start of a loop or a variable in .data. 
.data
.align 3
data: .word 0, 0
.text
# sd stores a two-register value. Initialize $t0/$t1 as 0x12345678:0x55667788; inspect bytes: 88 77 66 55 78 56 34 12.
la $t2, data
li $t0, 0x55667788
li $t1, 0x12345678
sd $t0, 0($t2)