#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*/ fputs(char *, int /*<<< orphan*/ *);
int /*<<< orphan*/ printf(char *);
int main() {
  FILE *p = fopen("D:\\temp\\a.txt", "w");
  if (p == NULL) {
    printf("file open fail\n");
  } else {
    fputs("hell\n", p);
    fputs("world\n", p);
    fclose(p);
  }
  printf("end\n");
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeaa(%rip),%rdi
lea    0xeb1(%rip),%rsi
call   1060 <fopen@plt>
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    1182 <main+0x42>
lea    0xe98(%rip),%rdi
call   1040 <printf@plt>
jmp    11ab <main+0x6b>
mov    -0x10(%rbp),%rsi
lea    0xe93(%rip),%rdi
call   1050 <fputs@plt>
mov    -0x10(%rbp),%rsi
lea    0xe89(%rip),%rdi
call   1050 <fputs@plt>
mov    -0x10(%rbp),%rdi
call   1030 <fclose@plt>
lea    0xe7b(%rip),%rdi
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
lea    0xeb8(%rip),%rdi
lea    0xebf(%rip),%rsi
call   1050 <fopen@plt>
test   %rax,%rax
je     1198 <main+0x58>
mov    %rax,%rbx
lea    0xead(%rip),%rdi
mov    $0x5,%esi
mov    $0x1,%edx
mov    %rax,%rcx
call   1060 <fwrite@plt>
lea    0xe9a(%rip),%rdi
mov    $0x6,%esi
mov    $0x1,%edx
mov    %rbx,%rcx
call   1060 <fwrite@plt>
mov    %rbx,%rdi
call   1040 <fclose@plt>
jmp    11a4 <main+0x64>
lea    0xe82(%rip),%rdi
call   1030 <puts@plt>
lea    0xe72(%rip),%rdi
call   1030 <puts@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [14 x i8] c"D:\\temp\\a.txt\00"
@.str.1 = [2 x i8] c"w\00"
@.str.2 = [16 x i8] c"file open fail\0A\00"
@.str.3 = [6 x i8] c"hell\0A\00"
@.str.4 = [7 x i8] c"world\0A\00"
@.str.5 = [5 x i8] c"end\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32*
store i32 0, i32* %1
%3 = call i32* @fopen(i8* getelementptr inbounds ([14 x i8], [14 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 eq i32* %4, null
br i1 %5, label %6, label %8
6: ; preds = %0
%7 = call i32 @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.2, i64 0, i64 0))
br label %15
8: ; preds = %0
%9 = load i32*, i32** %2
%10 = call i32 @fputs(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0), i32* %9)
%11 = load i32*, i32** %2
%12 = call i32 @fputs(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.4, i64 0, i64 0), i32* %11)
%13 = load i32*, i32** %2
%14 = call i32 @fclose(i32* %13)
br label %15
15: ; preds = %8, %6
%16 = call i32 @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.5, i64 0, i64 0))
ret i32 0
}

LLVM IR (-O2):
@.str = [14 x i8] c"D:\\temp\\a.txt\00"
@.str.1 = [2 x i8] c"w\00"
@.str.3 = [6 x i8] c"hell\0A\00"
@.str.4 = [7 x i8] c"world\0A\00"
@str = [4 x i8] c"end\00"
@str.6 = [15 x i8] c"file open fail\00"
define i32 @main() {
%1 = tail call i32* @fopen(i8* getelementptr inbounds ([14 x i8], [14 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 @puts(i8* dereferenceable(1) getelementptr inbounds ([15 x i8], [15 x i8]* @str.6, i64 0, i64 0))
br label %9
5: ; preds = %0
%6 = tail call i64 @fwrite(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0), i64 5, i64 1, i32* %1)
%7 = tail call i64 @fwrite(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.4, i64 0, i64 0), i64 6, i64 1, i32* %1)
%8 = tail call i32 @fclose(i32* %1)
br label %9
9: ; preds = %5, %3
%10 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @str, i64 0, i64 0))
ret i32 0
}