How can I see the assembly code that is generated by a gcc (any flavor) compiler for a C/C++ program?

Question

I am trying to optimize a lot of multiplications and pointer arithmetics and would like to see what the compiler does underneath when I put in optimization flags.

--Edit--

How to restrict it to a specific function or a code block?

--Edit_2--

How to let gcc generate a less verbose assembly-code?

Answer 1

Add -S switch to your command line.

Edit: Do not forget that it will place the assembly to the files you specified under -o switch.

Answer 2

This link describes how to ask GCC to produce assembly code output.

Answer 3

How to restrict it to a specific function or a code block?

Put that function in a separate source file (and use a different command-line parameter for that one source file).

Answer 4

You could stop you program at a breakpoint in the Visual Studio debugger and do "show assembly" and even step through it one instruction at a time.

Answer 5

Let me know if you can outperform mingw with -O3 and msvc with /Ox by 10 percent