For anyone who worked in embedded programming in the bad old days of proprietary compilers, it sometimes felt like the compiler working correctly was the common case. One of my first jobs involved programming a smallish, embeddedish, ruggedized computer in C. IIRC I wasted several hours on a bug once before realizing that it was a compiler issue and I needed to try arbitrarily rearranging the buggy function until it generated code that at least appeared to work.
