redoxfs | Mirror of https | File Utils library

The jump-instructions just check the flags corresponding to the suffix. There is no need for a cmp-instruction before the jump. In this case, The inc-instruction just increases the register, but the flags set by the cmp-instructions are tested by the jl instruction. The inc-instructions can set or reset flags. Eg. On overflow, the overflow flag is set. Most processors implement cmp, by substracting the registers, but only write to the flags. So the sub-instruction sets the same flags and can also be used for a comparison. Multiple branches after each other are also allowed, where the flags are rechecked by the jump-instructions.