A compiler is not a neutral pipeline. It is a translator with taste, deciding which idioms to honour, which to rewrite, which to silently undo on its way to machine code. Two compilers given the same source will not produce equivalent binaries because they do not share preferences.
Engineers who treat the compiler as a black box are surrendering decisions they did not know they were making. Read the assembly occasionally. The argument it is having with your source is instructive.
Compilers have opinions. Yours should know what they are.
