No. First that isn't SIMD code. Second, CMP r0,0 is redundant, operating on a register that is zero will set the zero flag automatically. You also skipped the string search/comparison part, but that isn't relevant, except that the operation will implicitly set the zero flag. Generally, plain JZ is faster than CMP + JZ. Even more so if it is SIMD.

And loads are amortized by tons of speculative preloading. Which isn't (yet, unfortunately) optimized by preload-length hints.

Oh, and since we are talking about comparing strings, there is no extra load. This isn't strlen(), this is strchr() or strstr() we are talking about. You always have to load the string into some register.