Reverse Engineering for Beginners

CHAPTER 25. SIMD CHAPTER 25. SIMD

mov edx, [edi+eax*4]

add edx, [esi+eax*4]

mov [ebx+eax*4], edx

add eax, 1

cmp eax, ecx

jnz short loc_80484C8

loc_80484D8: ; CODE XREF: f(int,int ,int ,int )+17
; f(int,int ,int ,int )+A5
add esp, 0Ch
xor eax, eax
pop ebx
pop esi
pop edi
pop ebp
retn

align 8

loc_80484E8: ; CODE XREF: f(int,int ,int ,int *)+1F
test bl, 0Fh
jnz short loc_80484C1
lea edx, [esi+10h]
cmp ebx, edx
jbe loc_8048578

loc_80484F8: ; CODE XREF: f(int,int ,int ,int *)+E0
lea edx, [edi+10h]
cmp ebx, edx
ja short loc_8048503
cmp edi, eax
jbe short loc_80484C1

loc_8048503: ; CODE XREF: f(int,int ,int ,int *)+5D
mov eax, ecx
shr eax, 2
mov [ebp+var_14], eax
shl eax, 2
test eax, eax
mov [ebp+var_10], eax
jz short loc_8048547
mov [ebp+var_18], ecx
mov ecx, [ebp+var_14]
xor eax, eax
xor edx, edx
nop

loc_8048520: ; CODE XREF: f(int,int ,int ,int *)+9B
movdqu xmm1, xmmword ptr [edi+eax]
movdqu xmm0, xmmword ptr [esi+eax]
add edx, 1
paddd xmm0, xmm1
movdqa xmmword ptr [ebx+eax], xmm0
add eax, 10h
cmp edx, ecx
jb short loc_8048520
mov ecx, [ebp+var_18]
mov eax, [ebp+var_10]
cmp ecx, eax
jz short loc_80484D8

loc_8048547: ; CODE XREF: f(int,int ,int ,int )+73
lea edx, ds:0[eax4]
add esi, edx
add edi, edx
add ebx, edx
lea esi, [esi+0]

loc_8048558: ; CODE XREF: f(int,int ,int ,int *)+CC
mov edx, [edi]