blt
Branch if less than
Branches to label if $t1 is less than $t2, or an immediate, as signed values.
Used in
- Comparing two numbersMIPS assembly
- Branch on compareMIPS assembly
- Arrays and stringsMIPS assembly
- The bitmap display and keyboard registersMIPS assembly
- Recursion: factorial and FibonacciMIPS assembly
- Print a number in any base without helpMIPS assembly
- Drawing shapes on the screenMIPS assembly
- A bouncing ballMIPS assembly
- Move a square with the keyboardMIPS assembly
- Flappy birdMIPS assembly
Forms
Operands
$t1- Any general-purpose register,
$0to$31, using its numeric or named spelling, such as$8or$t0($zerois$0;$rais$31). $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) 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.
# Run blt with one true and one false condition. A taken branch skips the assignment of 1; inspect $t2=2 for taken and $t3=1 for fall-through.
li $t0, 2
li $t1, 9
li $t2, 0
blt $t0, $t1, taken_one
li $t2, 1
b first_done # Skip the other marker unconditionally.
taken_one: li $t2, 2
first_done:
li $t0, 9
li $t1, 2
li $t3, 0
blt $t0, $t1, taken_two
li $t3, 1
b second_done # Skip the other marker unconditionally.
taken_two: li $t3, 2
second_done: