I know... and it's quite interesting really, but for the purpose of this thread, I think it's safe to say that the CPU-wallahs spend considerable effort on ways

I know... and it's quite interesting really, but for the purpose of this thread, I think it's safe to say that the CPU-wallahs spend considerable effort on ways to lighten or avoid register pressure, and from that I infer that all of the currently widely used CPUs do have significant pressure. Much more on the x86 than on sane architectures, of course.