Compiler bugs are surprisingly common - most people simply never notice them. Whether these bugs are major or not is a different topic. If you have a very larg

Compiler bugs are surprisingly common - most people simply never notice them. Whether these bugs are major or not is a different topic. If you have a very large scale test suite for your application, a large codebase, and exert most compiler features including the optimizer , you’ll probably find a few every time you upgrade .