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lwl

Load word left (unaligned)

Loads 1 to 4 bytes from an unaligned address into the high-order end of $t1, up to the end of that word.

Forms

  • lwl , ()

Pseudo-instructions

The assembler turns these into one or more real instructions.

Load from 1 to 4 bytes left-justified into $t1, starting with effective memory byte address and continuing through the low-order byte of its word

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 'lwr' to load a full 32-bit word from an unaligned address.

.data
.align 2
data: .word 0x12345678, 0
.text
# Start $t0 at 0xAABBCCDD; lwl merges bytes from the unaligned word at offset 1. Inspect $t0: 0x5678CCDD.
la $t1, data
li $t0, 0xAABBCCDD
lwl $t0, 1($t1)