CPUs are complex. This case is ridiculously visible, but I suspect that only obvious performance-broker pops and are fixed/warned. Non performance-critical "eve

CPUs are complex. This case is ridiculously visible, but I suspect that only obvious performance-broker pops and are fixed/warned. Non performance-critical "everyday corner cases" fly to production. I remember a blog post full of very specific cases that compiler don't optimize at all because the case could never appear in a performance sensitive code, but you could meet this situation in many code. There is a ratio benefit/cost in performance inspection, both human workload and compiler code maintenance/performance. You want to focus on what matter and on big code base where every performance curves are flat, you could think everything has been done.