OpenCV compatibility with ARM v6 processors

I recently posted instructions for installing OpenCV for Raspberry Pi Zero 1.3. I remember having a hard time installing the library on it. Took me a good one week to find something out there to do it correctly. I was relieved when it installed but now I have doubts about its compatibility with ARM v6 processors. Do processor’s instruction set type affect the performance/installation/(idk anything…) of OpenCV software?