I was recently surprised to find that GCC, at -O0, does some level of optimization. At least it does for multiplications. https://godbolt.org/g/ekTkBm https://g

I was recently surprised to find that GCC, at -O0, does some level of optimization. At least it does for multiplications. https://godbolt.org/g/ekTkBm https://godbolt.org/g/ekTkBm Edit: the irony is that if you do compile with optimizations, it does a different optimization.