CHAPTER 26. 64 BITS CHAPTER 26. 64 BITS
mov DWORD PTR _x36$[esp+32], eax
not eax
and eax, edx
or ebx, ebp
xor ebx, eax
not eax
and eax, DWORD PTR _x24$[esp+32]
not ebp
or eax, DWORD PTR _x3$[esp+36]
not esi
and ebp, eax
or eax, edx
xor eax, DWORD PTR _a5$[esp+32]
mov edx, DWORD PTR _x36$[esp+32]
xor edx, DWORD PTR _x4$[esp+36]
xor ebp, edi
mov edi, DWORD PTR _out1$[esp+32]
not eax
and eax, DWORD PTR _a2$[esp+32]
not ebp
and ebp, DWORD PTR _a1$[esp+32]
and edx, esi
xor eax, edx
or eax, DWORD PTR _a1$[esp+32]
not ebp
xor ebp, DWORD PTR [edi]
not ecx
and ecx, DWORD PTR _x33$[esp+32]
xor ebp, ebx
not eax
mov DWORD PTR [edi], ebp
xor eax, ecx
mov ecx, DWORD PTR _out3$[esp+32]
xor eax, DWORD PTR [ecx]
pop edi
pop esi
xor eax, ebx
pop ebp
mov DWORD PTR [ecx], eax
pop ebx
add esp, 20 ; 00000014H
ret 0
_s1 ENDP
5 variables were allocated in the local stack by the compiler.
Now let’s try the same thing in the 64-bit version of MSVC 2008:
Listing 26.2: Optimizing MSVC 2008a1$ = 56
a2$ = 64
a3$ = 72
a4$ = 80
x36$1$ = 88
a5$ = 88
a6$ = 96
out1$ = 104
out2$ = 112
out3$ = 120
out4$ = 128
s1 PROC
$LN3:
mov QWORD PTR [rsp+24], rbx
mov QWORD PTR [rsp+32], rbp
mov QWORD PTR [rsp+16], rdx
mov QWORD PTR [rsp+8], rcx
push rsi
push rdi
push r12
push r13