#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 /*<<< orphan*/ perror(char *);
int main(void) {
  FILE *myfile = fopen("filename.txt", "w");
  if (!myfile) {
    perror("loololol");
    return 1;
  }
  fprintf(myfile, "yolooo");
  fclose(myfile);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeaa(%rip),%rdi
lea    0xeb0(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    1189 <main+0x49>
lea    0xe97(%rip),%rdi
call   1060 <perror@plt>
movl   $0x1,-0x4(%rbp)
jmp    11a2 <main+0x62>
mov    -0x10(%rbp),%rdi
lea    0xe84(%rip),%rsi
call   1040 <fprintf@plt>
mov    -0x10(%rbp),%rdi
call   1030 <fclose@plt>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
lea    0xeb8(%rip),%rdi
lea    0xebe(%rip),%rsi
call   1040 <fopen@plt>
test   %rax,%rax
je     1181 <main+0x41>
mov    %rax,%rbx
lea    0xeb5(%rip),%rdi
mov    $0x6,%esi
mov    $0x1,%edx
mov    %rax,%rcx
call   1060 <fwrite@plt>
mov    %rbx,%rdi
call   1030 <fclose@plt>
xor    %eax,%eax
pop    %rbx
ret
lea    0xe87(%rip),%rdi
call   1050 <perror@plt>
mov    $0x1,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [13 x i8] c"filename.txt\00"
@.str.1 = [2 x i8] c"w\00"
@.str.2 = [9 x i8] c"loololol\00"
@.str.3 = [7 x i8] c"yolooo\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32*
store i32 0, i32* %1
%3 = call i32* @fopen(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %3, i32** %2
%4 = load i32*, i32** %2
%5 = icmp ne i32* %4, null
br i1 %5, label %8, label %6
6: ; preds = %0
%7 = call i32 @perror(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.2, i64 0, i64 0))
store i32 1, i32* %1
br label %13
8: ; preds = %0
%9 = load i32*, i32** %2
%10 = call i32 @fprintf(i32* %9, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.3, i64 0, i64 0))
%11 = load i32*, i32** %2
%12 = call i32 @fclose(i32* %11)
br label %13
13: ; preds = %8, %6
%14 = load i32, i32* %1
ret i32 %14
}

LLVM IR (-O2):
@.str = [13 x i8] c"filename.txt\00"
@.str.1 = [2 x i8] c"w\00"
@.str.2 = [9 x i8] c"loololol\00"
@.str.3 = [7 x i8] c"yolooo\00"
define i32 @main() {
%1 = tail call i32* @fopen(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%2 = icmp eq i32* %1, null
br i1 %2, label %3, label %5
3: ; preds = %0
%4 = tail call i32 @perror(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.2, i64 0, i64 0))
br label %8
5: ; preds = %0
%6 = tail call i64 @fwrite(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.3, i64 0, i64 0), i64 6, i64 1, i32* %1)
%7 = tail call i32 @fclose(i32* %1)
br label %8
8: ; preds = %5, %3
%9 = phi i32 [ 0, %5 ], [ 1, %3 ]
ret i32 %9
}