#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*/ freopen(char *, char *, int /*<<< orphan*/);
int /*<<< orphan*/ printf(char *, int);
scalar_t__ scanf(char *, int *, int *);
int /*<<< orphan*/ stdin;
int main() {
  freopen("in.txt", "r", stdin);
  int a, b;
  while (scanf("%d%d", &a, &b) != EOF) {
    printf("%d\n", a + b);
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    0x2ea2(%rip),%rax
mov    (%rax),%edx
lea    0xeb1(%rip),%rdi
lea    0xeb1(%rip),%rsi
call   1040 <freopen@plt>
lea    0xea7(%rip),%rdi
lea    -0x8(%rbp),%rsi
lea    -0xc(%rbp),%rdx
call   1050 <scanf@plt>
mov    0x2e6a(%rip),%rcx
cmp    (%rcx),%rax
je     1196 <main+0x66>
mov    -0x8(%rbp),%esi
add    -0xc(%rbp),%esi
lea    0xe82(%rip),%rdi
call   1030 <printf@plt>
jmp    115b <main+0x2b>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x10,%rsp
mov    0x2ea4(%rip),%rax
mov    (%rax),%edx
lea    0xeb3(%rip),%rdi
lea    0xeb3(%rip),%rsi
call   1040 <freopen@plt>
lea    0xea9(%rip),%rdi
lea    0xc(%rsp),%rsi
lea    0x8(%rsp),%rdx
call   1050 <scanf@plt>
mov    0x2e6a(%rip),%r13
cmp    0x0(%r13),%rax
je     11c4 <main+0x94>
lea    0xe8b(%rip),%r14
lea    0xe7f(%rip),%r15
lea    0xc(%rsp),%r12
lea    0x8(%rsp),%rbx
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
mov    0x8(%rsp),%esi
add    0xc(%rsp),%esi
mov    %r14,%rdi
call   1030 <printf@plt>
mov    %r15,%rdi
mov    %r12,%rsi
mov    %rbx,%rdx
call   1050 <scanf@plt>
cmp    0x0(%r13),%rax
jne    11a0 <main+0x70>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
ret

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

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