5. Conditions

Conditions

In this section, we will speak about conditions to compare registers and their values. The first thing you need to know is the first instruction CMP which means "Compare" and you have to specify the register and a value.

Format: CMP Re, #Value

Warning: if the condition return "false", make sure to do a jump to don't run content from the label if the condition was true.

Greater or Equal (BGE)

Format: BGE label

Example:

MOV R0, #10
CMP R0, #9
BGE condition_true
MOV R1, #1
condition_true:
    MOV R1, #0
    
MOV R0, #3
CMP R0, #5
BGE condition_true2
MOV R1, #1
condition_true2:
    MOV R1, #0

Greater (BGT)

Format: BGT label

Example:

MOV R0, #10
CMP R0, #25
BGT condition_true
MOV R1, #1
condition_true:
    MOV R1, #0
    
MOV R0, #3
CMP R0, #3
BGT condition_true2
MOV R1, #1
condition_true2:
    MOV R1, #0

Lower or Equal (BLE)

Format: BLE label

Example:

MOV R0, #25
CMP R0, #10
BLE condition_true
MOV R1, #1
condition_true:
    MOV R1, #0
    
MOV R0, #4
CMP R0, #3
BLE condition_true2
MOV R1, #1
condition_true2:
    MOV R1, #0

Lower (BLT)

Format: BLT label

Example:

MOV R0, #25
CMP R0, #10
BLT condition_true
MOV R1, #1
condition_true:
    MOV R1, #0
    
MOV R0, #3
CMP R0, #3
BLT condition_true2
MOV R1, #1
condition_true2:
    MOV R1, #0

Lower (BEQ)

Format: BEQ label

Example:

MOV R0, #30
CMP R0, #30
BEQ condition_true
MOV R1, #1
condition_true:
    MOV R1, #0
    
MOV R0, #3
CMP R0, #0
BEQ condition_true2
MOV R1, #1
condition_true2:
    MOV R1, #0