#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*/ printf(char *);
int main01(void) {
  FILE *p = fopen("D:\\temp\\a.txt", "r");
  if (p == NULL) {
    printf("file open fail\n");
  } else {
    printf("file open success\n");
    fclose(p);
  }
  printf("end\n");
  return 0;
}


x86 assembly (clang, -O0):
<main01>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
lea    0xec1(%rip),%rdi
lea    0xec8(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x8(%rbp)
cmpq   $0x0,-0x8(%rbp)
jne    116b <main01+0x3b>
lea    0xeaf(%rip),%rdi
call   1040 <printf@plt>
jmp    1180 <main01+0x50>
lea    0xeae(%rip),%rdi
call   1040 <printf@plt>
mov    -0x8(%rbp),%rdi
call   1030 <fclose@plt>
lea    0xeac(%rip),%rdi
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main01>:
push   %rbx
lea    0xec8(%rip),%rdi
lea    0xecf(%rip),%rsi
call   1050 <fopen@plt>
test   %rax,%rax
je     1162 <main01+0x32>
mov    %rax,%rbx
lea    0xebd(%rip),%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
call   1040 <fclose@plt>
jmp    116e <main01+0x3e>
lea    0xebd(%rip),%rdi
call   1030 <puts@plt>
lea    0xead(%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"r\00"
@.str.2 = [16 x i8] c"file open fail\0A\00"
@.str.3 = [19 x i8] c"file open success\0A\00"
@.str.4 = [5 x i8] c"end\0A\00"
define i32 @main01() {
%1 = alloca i32*
%2 = 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* %2, i32** %1
%3 = load i32*, i32** %1
%4 = icmp eq i32* %3, null
br i1 %4, label %5, label %7
5: ; preds = %0
%6 = call i32 @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.2, i64 0, i64 0))
br label %11
7: ; preds = %0
%8 = call i32 @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.3, i64 0, i64 0))
%9 = load i32*, i32** %1
%10 = call i32 @fclose(i32* %9)
br label %11
11: ; preds = %7, %5
%12 = call i32 @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.4, 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"r\00"
@str = [18 x i8] c"file open success\00"
@str.5 = [4 x i8] c"end\00"
@str.6 = [15 x i8] c"file open fail\00"
define i32 @main01() {
%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 %8
5: ; preds = %0
%6 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([18 x i8], [18 x i8]* @str, i64 0, i64 0))
%7 = tail call i32 @fclose(i32* %1)
br label %8
8: ; preds = %5, %3
%9 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @str.5, i64 0, i64 0))
ret i32 0
}