CHAPTER 26. 64 BITS CHAPTER 26. 64 BITS
x36 = a3 & x28;
x37 = x18 & ~x36;
x38 = a2 | x3;
x39 = x37 ^ x38;
x40 = a3 | x31;
x41 = x24 & ~x37;
x42 = x41 | x3;
x43 = x42 & ~a2;
x44 = x40 ^ x43;
x45 = a1 & ~x44;
x46 = x39 ^ ~x45;
*out1 ^= x46;
x47 = x33 & ~x9;
x48 = x47 ^ x39;
x49 = x4 ^ x36;
x50 = x49 & ~x5;
x51 = x42 | x18;
x52 = x51 ^ a5;
x53 = a2 & ~x52;
x54 = x50 ^ x53;
x55 = a1 | x54;
x56 = x48 ^ ~x55;
*out3 ^= x56;
}There are a lot of local variables. Of course, not all those going into the local stack. Let’s compile it with MSVC 2008 with
/Oxoption:
Listing 26.1: Optimizing MSVC 2008
PUBLIC _s1
; Function compile flags: /Ogtpy
_TEXT SEGMENT
_x6$ = -20 ; size = 4
_x3$ = -16 ; size = 4
_x1$ = -12 ; size = 4
_x8$ = -8 ; size = 4
_x4$ = -4 ; size = 4
_a1$ = 8 ; size = 4
_a2$ = 12 ; size = 4
_a3$ = 16 ; size = 4
_x33$ = 20 ; size = 4
_x7$ = 20 ; size = 4
_a4$ = 20 ; size = 4
_a5$ = 24 ; size = 4
tv326 = 28 ; size = 4
_x36$ = 28 ; size = 4
_x28$ = 28 ; size = 4
_a6$ = 28 ; size = 4
_out1$ = 32 ; size = 4
_x24$ = 36 ; size = 4
_out2$ = 36 ; size = 4
_out3$ = 40 ; size = 4
_out4$ = 44 ; size = 4
_s1 PROC
sub esp, 20 ; 00000014H
mov edx, DWORD PTR _a5$[esp+16]
push ebx
mov ebx, DWORD PTR _a4$[esp+20]
push ebp
push esi
mov esi, DWORD PTR _a3$[esp+28]
push edi
mov edi, ebx
not edi
mov ebp, edi
and edi, DWORD PTR _a5$[esp+32]
mov ecx, edx
not ecx
and ebp, esi
mov eax, ecx