#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
scalar_t__ EOF;
int /*<<< orphan*/ printf(char *, unsigned long long);
scalar_t__ scanf(char *, unsigned long long *, unsigned long long *);
int main(int argc, char const *argv[]) {
  unsigned long long int a = 0, b = 0;
  while (scanf("%llu %llu", &a, &b) != EOF) {
    printf("%llu\n", a ^ b);
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
movq   $0x0,-0x18(%rbp)
movq   $0x0,-0x20(%rbp)
lea    0xeb3(%rip),%rdi
lea    -0x18(%rbp),%rsi
lea    -0x20(%rbp),%rdx
call   1040 <scanf@plt>
mov    0x2e87(%rip),%rcx
cmp    (%rcx),%rax
je     1183 <main+0x63>
mov    -0x18(%rbp),%rsi
xor    -0x20(%rbp),%rsi
lea    0xe91(%rip),%rdi
call   1030 <printf@plt>
jmp    1146 <main+0x26>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x10,%rsp
movq   $0x0,0x8(%rsp)
movq   $0x0,(%rsp)
lea    0xebb(%rip),%rdi
lea    0x8(%rsp),%rsi
mov    %rsp,%rdx
call   1040 <scanf@plt>
mov    0x2e8f(%rip),%r13
cmp    0x0(%r13),%rax
je     11a5 <main+0x85>
lea    0xea4(%rip),%r14
lea    0xe93(%rip),%r15
lea    0x8(%rsp),%r12
mov    %rsp,%rbx
cs nopw 0x0(%rax,%rax,1)
nop
mov    (%rsp),%rsi
xor    0x8(%rsp),%rsi
mov    %r14,%rdi
call   1030 <printf@plt>
mov    %r15,%rdi
mov    %r12,%rsi
mov    %rbx,%rdx
call   1040 <scanf@plt>
cmp    0x0(%r13),%rax
jne    1180 <main+0x60>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [10 x i8] c"%llu %llu\00"
@EOF = global i64 0
@.str.1 = [6 x i8] c"%llu\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i64
%7 = alloca i64
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
store i64 0, i64* %6
store i64 0, i64* %7
br label %8
8: ; preds = %12, %2
%9 = call i64 @scanf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i64* %6, i64* %7)
%10 = load i64, i64* @EOF
%11 = icmp ne i64 %9, %10
br i1 %11, label %12, label %17
12: ; preds = %8
%13 = load i64, i64* %6
%14 = load i64, i64* %7
%15 = xor i64 %13, %14
%16 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i64 %15)
br label %8
17: ; preds = %8
ret i32 0
}

LLVM IR (-O2):
@.str = [10 x i8] c"%llu %llu\00"
@EOF = global i64 0
@.str.1 = [6 x i8] c"%llu\0A\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca i64
%4 = alloca i64
%5 = bitcast i64* %3 to i8*
store i64 0, i64* %3
%6 = bitcast i64* %4 to i8*
store i64 0, i64* %4
%7 = call i64 @scanf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i64* %3, i64* %4)
%8 = load i64, i64* @EOF
%9 = icmp eq i64 %7, %8
br i1 %9, label %18, label %10
10: ; preds = %2, %10
%11 = load i64, i64* %3
%12 = load i64, i64* %4
%13 = xor i64 %12, %11
%14 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i64 %13)
%15 = call i64 @scanf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i64* %3, i64* %4)
%16 = load i64, i64* @EOF
%17 = icmp eq i64 %15, %16
br i1 %17, label %18, label %10
18: ; preds = %10, %2
ret i32 0
}