3.3. TEMPERATURE CONVERTING
exit(0);
};
printf ("Celsius: %d\n", celsius);
};
Optimizing MSVC 2012 x86
Listing 3.1: Optimizing MSVC 2012 x86$SG4228 DB 'Enter temperature in Fahrenheit:', 0aH, 00H
$SG4230 DB '%d', 00H
$SG4231 DB 'Error while parsing your input', 0aH, 00H
$SG4233 DB 'Error: incorrect temperature!', 0aH, 00H
$SG4234 DB 'Celsius: %d', 0aH, 00H
_fahr$ = -4 ; size = 4
_main PROC
push ecx
push esi
mov esi, DWORD PTR impprintf
push OFFSET $SG4228 ; 'Enter temperature in Fahrenheit:'
call esi ; call printf()
lea eax, DWORD PTR _fahr$[esp+12]
push eax
push OFFSET $SG4230 ; '%d'
call DWORD PTR impscanf
add esp, 12
cmp eax, 1
je SHORT $LN2@main
push OFFSET $SG4231 ; 'Error while parsing your input'
call esi ; call printf()
add esp, 4
push 0
call DWORD PTR impexit
$LN9@main:
$LN2@main:
mov eax, DWORD PTR _fahr$[esp+8]
add eax, -32 ; ffffffe0H
lea ecx, DWORD PTR [eax+eax*4]
mov eax, 954437177 ; 38e38e39H
imul ecx
sar edx, 1
mov eax, edx
shr eax, 31 ; 0000001fH
add eax, edx
cmp eax, -273 ; fffffeefH
jge SHORT $LN1@main
push OFFSET $SG4233 ; 'Error: incorrect temperature!'
call esi ; call printf()
add esp, 4
push 0
call DWORD PTR impexit
$LN10@main:
$LN1@main:
push eax
push OFFSET $SG4234 ; 'Celsius: %d'
call esi ; call printf()
add esp, 8
; return 0 - by C99 standard
xor eax, eax
pop esi
pop ecx
ret 0
$LN8@main:
_main ENDP
What we can say about it: