#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*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/ *, char *);
int main() {
  FILE *fp1;
  fp1 = fopen("test1.txt", "a");
  FILE *fp2;
  fp2 = fopen("test2.txt", "r");
  FILE *fp;
  int b;
  if (b) {
    fp = fp1;
  } else {
    fp = fp2;
  }
  fprintf(fp, "Testing...\n");
  fclose(fp);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeba(%rip),%rdi
lea    0xebd(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x10(%rbp)
lea    0xeaf(%rip),%rdi
lea    0xeb2(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmpl   $0x0,-0x24(%rbp)
je     1184 <main+0x54>
mov    -0x10(%rbp),%rax
mov    %rax,-0x20(%rbp)
jmp    118c <main+0x5c>
mov    -0x18(%rbp),%rax
mov    %rax,-0x20(%rbp)
mov    -0x20(%rbp),%rdi
lea    0xe81(%rip),%rsi
call   1040 <fprintf@plt>
mov    -0x20(%rbp),%rdi
call   1030 <fclose@plt>
mov    -0x4(%rbp),%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
lea    0xec8(%rip),%rdi
lea    0xecb(%rip),%rsi
call   1040 <fopen@plt>
lea    0xec1(%rip),%rdi
lea    0xec4(%rip),%rsi
call   1040 <fopen@plt>
mov    %rax,%rbx
lea    0xeb7(%rip),%rdi
mov    $0xb,%esi
mov    $0x1,%edx
mov    %rax,%rcx
call   1050 <fwrite@plt>
mov    %rbx,%rdi
call   1030 <fclose@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [10 x i8] c"test1.txt\00"
@.str.1 = [2 x i8] c"a\00"
@.str.2 = [10 x i8] c"test2.txt\00"
@.str.3 = [2 x i8] c"r\00"
@.str.4 = [12 x i8] c"Testing...\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32*
%3 = alloca i32*
%4 = alloca i32*
%5 = alloca i32
store i32 0, i32* %1
%6 = call i32* @fopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %6, i32** %2
%7 = call i32* @fopen(i8* getelementptr inbounds ([10 x i8], [10 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* %7, i32** %3
%8 = load i32, i32* %5
%9 = icmp ne i32 %8, 0
br i1 %9, label %10, label %12
10: ; preds = %0
%11 = load i32*, i32** %2
store i32* %11, i32** %4
br label %14
12: ; preds = %0
%13 = load i32*, i32** %3
store i32* %13, i32** %4
br label %14
14: ; preds = %12, %10
%15 = load i32*, i32** %4
%16 = call i32 @fprintf(i32* %15, i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.4, i64 0, i64 0))
%17 = load i32*, i32** %4
%18 = call i32 @fclose(i32* %17)
%19 = load i32, i32* %1
ret i32 %19
}

LLVM IR (-O2):
@.str = [10 x i8] c"test1.txt\00"
@.str.1 = [2 x i8] c"a\00"
@.str.2 = [10 x i8] c"test2.txt\00"
@.str.3 = [2 x i8] c"r\00"
@.str.4 = [12 x i8] c"Testing...\0A\00"
define i32 @main() {
%1 = tail call i32* @fopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%2 = tail call i32* @fopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
%3 = tail call i64 @fwrite(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.4, i64 0, i64 0), i64 11, i64 1, i32* %2)
%4 = tail call i32 @fclose(i32* %2)
ret i32 0
}