Convert the assembly code back into C

func$3$:

pushq $\%$rbp

movq $\%$rsp$,\%$rbp

subq $$16,\%$rsp

movl $\%$edi, $-4(\%$rbp$)$

movl $\%$esi, $-8(\%$rbp$)$

movl $\%$edx, $-12(\%$rbp$)$

movl $-8(\%$rbp$),\%$eax

subl $-12(\%$rbp$),\%$eax

movl $\%$eax, $-4(\%$rbp$)$

movl $-8(\%$rbp$),\%$edx

movl $-4(\%$rbp$),\%$eax

addl $\%$eax, $\%$edx

movl $-4(\%$rbp$),\%$eax

addl $\%$edx, $\%$eax

addl $\%$eax, $-12(\%$rbp$)$

movl $-4(\%$rbp$),\%$eax

sall $$3,\%$eax

movl $\%$eax, $-8(\%$rbp$)$

movl $-8(\%$rbp$),\%$eax

leave

ret