main() {
  int A, B, K;
  printf("Inserisci il valore di A");
  scanf("%d", &A);
  printf("Inserisci il valore di B");
  scanf("%d", &B);
  K = A;
  A = B;
  B = K;
  printf("%d", &A);
  printf("%d", &B);
  system("PAUSE");
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
lea    0xec1(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xecc(%rip),%rdi
lea    -0x4(%rbp),%rsi
mov    $0x0,%al
call   1050 <scanf@plt>
lea    0xebd(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xeac(%rip),%rdi
lea    -0x8(%rbp),%rsi
mov    $0x0,%al
call   1050 <scanf@plt>
mov    -0x4(%rbp),%eax
mov    %eax,-0xc(%rbp)
mov    -0x8(%rbp),%eax
mov    %eax,-0x4(%rbp)
mov    -0xc(%rbp),%eax
mov    %eax,-0x8(%rbp)
lea    0xe88(%rip),%rdi
lea    -0x4(%rbp),%rsi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xe76(%rip),%rdi
lea    -0x8(%rbp),%rsi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xe80(%rip),%rdi
mov    $0x0,%al
call   1030 <system@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
sub    $0x10,%rsp
lea    0xec0(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xecb(%rip),%rbx
lea    0xc(%rsp),%r14
mov    %rbx,%rdi
mov    %r14,%rsi
xor    %eax,%eax
call   1050 <scanf@plt>
lea    0xeb5(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0x8(%rsp),%r15
mov    %rbx,%rdi
mov    %r15,%rsi
xor    %eax,%eax
call   1050 <scanf@plt>
mov    0xc(%rsp),%eax
mov    0x8(%rsp),%ecx
mov    %ecx,0xc(%rsp)
mov    %eax,0x8(%rsp)
mov    %rbx,%rdi
mov    %r14,%rsi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    %r15,%rsi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xe84(%rip),%rdi
xor    %eax,%eax
call   1030 <system@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [25 x i8] c"Inserisci il valore di A\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [25 x i8] c"Inserisci il valore di B\00"
@.str.3 = [6 x i8] c"PAUSE\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0))
%5 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%6 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.2, i64 0, i64 0))
%7 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%8 = load i32, i32* %1
store i32 %8, i32* %3
%9 = load i32, i32* %2
store i32 %9, i32* %1
%10 = load i32, i32* %3
store i32 %10, i32* %2
%11 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%13 = call i32 (i8*, ...) bitcast (i32 (...)* @system to i32 (i8*, ...)*)(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0))
ret i32 0
}

LLVM IR (-O2):
@.str = [25 x i8] c"Inserisci il valore di A\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [25 x i8] c"Inserisci il valore di B\00"
@.str.3 = [6 x i8] c"PAUSE\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = bitcast i32* %1 to i8*
%4 = bitcast i32* %2 to i8*
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0))
%6 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%7 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @.str.2, i64 0, i64 0))
%8 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%9 = load i32, i32* %1
%10 = load i32, i32* %2
store i32 %10, i32* %1
store i32 %9, i32* %2
%11 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%12 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%13 = call i32 (i8*, ...) bitcast (i32 (...)* @system to i32 (i8*, ...)*)(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0))
ret i32 0
}