ARM Assembler - How do I use CMP, BLT and BGT?

Question

Quick question for you guys, in my loop I need to use CMP , BLT and BGT to compare some values. How would use said instructions in the following loop?

I\'m trying to use

Answer 1

If I wanted to use CMP to compare r6, with r4 and put the difference into r7, how would I do this?

subs r7, r6, r4    /* r7 ← r6 - r4 */

The same question if I wanted to use BLT if r7 is less than 0, how would I do this?

bmi _exit          /* branch if r7 < 0 */

BMI (minus/negative) When N is enabled (N is 1) where N is a flag that will be enabled if the result of the instruction yields a negative number. Disabled otherwise.

Why subS instead of sub? Because S is an optional suffix that when is specified, the condition flags (like N) are updated on the result of the operation.

Regards.