I read an article in which different compilers were compared to infer which is the best in different circumstances. It gave me a thought. Even though I tried to google, I didn't manage to find a clear and lucid answer: will the program run faster or slower if I use different compilers to compile it? Suppose, it's some uncommon complicated algorithm that is used along with templating.

CodePudding user response：

Yes. The compiler is what writes a program that implements the behavior you've described with your C or C code. Different compilers (or even the same compiler, given different options) can come up with vastly different programs that implement the same behavior.

Remember, your CPU does not execute C or C code. It only executes machine code. There is no defined standard for how the former gets transformed into the latter.

CodePudding user response：

It may depend on the compiler, compiler version, compiler optimization settings, C language version used when compiling, the linker used, linker optimization options and much more. So in short, the answer to your question is Yes.