Need help. Explain why assembly code is wrong.
C code:
long f(long n) {return n + 1} ;

Assembly:
f:
movq rdi, rbp
addq $1, rbp
movq rbp, rax
ret

Don't assembly instructions typically have the destination register on the left? Example:
movq foo, bar
would move from bar into foo.
Looks like you've got your operands the wrong way around.

@fbomb ah; good to know, thank you!

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If you mean it cant compile, try add % for registers.

If you mean the style is wrong, it is becoz you should use a stack frame for function http://stackoverflow.com/questions/...

@BikerMouse awesome sites.
Never seen these before. Will use.

You should not use rpb since is the base pointer of the stack frame. If you use it you need to restore it before the ret instruction. Either do
movq %rdi, %rax
addq $1, %rax
ret

Or
push %rbp
movq %rdi, %rbp
addq $1, %rbp
movq %rbp, %rax
pop %rbp
ret