This easily turns into a strawman. Does writing good C code include checking the disassembly and reworking the C code when the compiler produces bad results? I

This easily turns into a strawman. Does writing good C code include checking the disassembly and reworking the C code when the compiler produces bad results? I've seen several examples of the compiler being brilliant until suddenly a simple change makes it not brilliant at all anymore. Compilers are just tools.