; funx
;
, function to find and return the minimum, maximum, sum, medians, and average of an array
; 
; High-Level Language (HLL) call for C/C++ 
;
; stats2(arr, len, min, med1, med2, max, sum, ave);
; Arguments:
; arr, address – rdi
; len, dword value – esi
; min, address – rdx
; med1, address - rcx
; med2, address - r8
; max, address - r9
; sum, address – stack (rbp+16)
; ave, address – stack (rbp+24)
global stats2      ;static function (leaf)
stats2:
push rbp
mov rbp, rsp
rbp, rsp
push r12
;
; Get min and max
mov eax, dword [rdi]     ; get min
mov dword [rdx], eax     ; return min
mov r12, rsi             ; get len
dec r12                  ; set len-1
mov eax, dword [rdi+r12*4] ; get max
mov dword [r9], eax      ; return max
;
; Get medians
mov rax, rsi
mov rdx, 0
mov r12, 2
div r12                  ; rax = length/2

cmp rdx, 0               ; even/odd length?
je evenLength

mov r12d, dword [rdi+rax*4]   ; get arr[len/2]
mov dword [rcx], r12d         ; return med1
mov dword [r8], r12d          ; return med2
jmp medDone 

evenLength:
mov r12d, dword [rdi+rax*4]   ; get arr[len/2]
mov dword [r8], r12d          ; return med2
dec rax 
mov r12d, dword [rdi+rax*4]   ; get arr[len/2-1]
mov dword [rcx], r12d         ; return med1

medDone:                      ; find sum
mov r12, 0                    ; counter/index
mov rax, 0                    ; running sum

sumLoop:
add eax, dword [rdi+r12*4]    ; sum += arr[i]
inc r12
cmp r12, rsi
jl sumLoop

; Calculate average
cdq
idiv rsi                      ; average = sum/len
mov r12, qword [rbp+24]       ; get average address
mov dword [r12], eax          ; return average

pop r12        
pop rbp
ret