Interactive Compiler explorer

[hexagone]

Not perfect but can be pretty useful (especially to compare compiler output):

http://gcc.godbolt.org/

Example:

int square(int num) {
return num * num;
}

square(int):
pushq %rbp
movq %rsp, %rbp
movl %edi, -4(%rbp)
movl -4(%rbp), %eax
imull -4(%rbp), %eax
popq %rbp
ret

[nikkho]

Very nice, allowing to use different compilers, and compilation flags.

[nikkho]

Here is same example code with ICC 13, and -O3:

L__routine_start__Z6squarei_0:
square(int):
        imull     %edi, %edi                                    #2.15
        movl      %edi, %eax                                    #2.15
        ret                                                     #2.15