#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 */
typedef int /*<<< orphan*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/ *, char *, int);
int /*<<< orphan*/ fscanf(int /*<<< orphan*/ *, char *, int *, int *);
int main() {
  FILE *fin = fopen("test.in", "r");
  FILE *fout = fopen("test.out", "w");
  int a, b;
  fscanf(fin, "%d %d", &a, &b);
  fprintf(fout, "%d\n", a + b);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
lea    0xec1(%rip),%rdi
lea    0xec2(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x8(%rbp)
lea    0xeb4(%rip),%rdi
lea    0xeb6(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x10(%rbp)
mov    -0x8(%rbp),%rdi
lea    0xea4(%rip),%rsi
lea    -0x14(%rbp),%rdx
lea    -0x18(%rbp),%rcx
call   1030 <fscanf@plt>
mov    -0x10(%rbp),%rdi
mov    -0x14(%rbp),%edx
add    -0x18(%rbp),%edx
lea    0xe8c(%rip),%rsi
call   1040 <fprintf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
lea    0xec5(%rip),%rdi
lea    0xec6(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,%rbx
lea    0xeb9(%rip),%rdi
lea    0xebb(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,%r14
lea    0xeae(%rip),%rsi
lea    0x4(%rsp),%rdx
mov    %rsp,%rcx
mov    %rbx,%rdi
call   1030 <fscanf@plt>
mov    (%rsp),%edx
add    0x4(%rsp),%edx
lea    0xe96(%rip),%rsi
mov    %r14,%rdi
call   1040 <fprintf@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [8 x i8] c"test.in\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [9 x i8] c"test.out\00"
@.str.3 = [2 x i8] c"w\00"
@.str.4 = [6 x i8] c"%d %d\00"
@.str.5 = [4 x i8] c"%d\0A\00"
define i32 @main() {
%1 = alloca i32*
%2 = alloca i32*
%3 = alloca i32
%4 = alloca i32
%5 = call i32* @fopen(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %5, i32** %1
%6 = call i32* @fopen(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
store i32* %6, i32** %2
%7 = load i32*, i32** %1
%8 = call i32 @fscanf(i32* %7, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.4, i64 0, i64 0), i32* %3, i32* %4)
%9 = load i32*, i32** %2
%10 = load i32, i32* %3
%11 = load i32, i32* %4
%12 = add nsw i32 %10, %11
%13 = call i32 @fprintf(i32* %9, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.5, i64 0, i64 0), i32 %12)
ret i32 0
}

LLVM IR (-O2):
@.str = [8 x i8] c"test.in\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [9 x i8] c"test.out\00"
@.str.3 = [2 x i8] c"w\00"
@.str.4 = [6 x i8] c"%d %d\00"
@.str.5 = [4 x i8] c"%d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = tail call i32* @fopen(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%4 = tail call i32* @fopen(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
%5 = bitcast i32* %1 to i8*
%6 = bitcast i32* %2 to i8*
%7 = call i32 @fscanf(i32* %3, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.4, i64 0, i64 0), i32* %1, i32* %2)
%8 = load i32, i32* %1
%9 = load i32, i32* %2
%10 = add nsw i32 %9, %8
%11 = call i32 @fprintf(i32* %4, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.5, i64 0, i64 0), i32 %10)
ret i32 0
}