If I had the skill, I would want to create my own C compiler that tried not to optimize things like this, e.g. don't optimize away infinite loops, don't optimiz

If I had the skill, I would want to create my own C compiler that tried not to optimize things like this, e.g. don't optimize away infinite loops, don't optimize away signed overflow checks or do incorrect algebraic simplifications because signed overflow is undefined behavior, and by default act as though -fno-strict-aliasing were on. Add options for trapping on overflow or optimizing away overflow checks, signed or unsigned. Just do register allocation and minor constant folding (but again, don't act like signed overflow doesn't exist, and don't do constant folding across pointer writes if its address has been taken). There exist open source C compilers that aren't GCC or Clang, such as TCC and Zig, but to my knowledge they all produce really, really bad assembly. There existed proprietary C compilers in the 1980s and 1990s that were written by one or two people that still produced solid assembly, so it's possible, just no one has done it, so Clang and GCC are the only free and open source options for decent assembly for C. Those two also have the downside of being C++ compilers, making them more complex than they need to be. Maybe another option would be to improve an already existing open source C compiler's codegen than to write a new one from scratch again, assuming they'd agree with the above ideals.