#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 *);
main() {
  FILE *fp;
  fp = fopen("prog1.c", "r");
  if (fp == NULL) {
    printf("\n\n Error: File cannot be opened");
  } else {
    printf("\n\n File opened successfully\n\n");
    fclose(fp);
    printf("\n\n File has been now closed \n\n");
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeba(%rip),%rdi
lea    0xebb(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    1172 <main+0x42>
lea    0xea2(%rip),%rdi
call   1040 <printf@plt>
jmp    1193 <main+0x63>
lea    0xeb1(%rip),%rdi
call   1040 <printf@plt>
mov    -0x10(%rbp),%rdi
call   1030 <fclose@plt>
lea    0xeba(%rip),%rdi
call   1040 <printf@plt>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
lea    0xeb8(%rip),%rdi
lea    0xeb9(%rip),%rsi
call   1060 <fopen@plt>
test   %rax,%rax
je     117e <main+0x3e>
mov    %rax,%rbx
lea    0xec7(%rip),%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
call   1040 <fclose@plt>
lea    0xed0(%rip),%rdi
call   1030 <puts@plt>
jmp    118a <main+0x4a>
lea    0xe85(%rip),%rdi
call   1050 <printf@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [8 x i8] c"prog1.c\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [32 x i8] c"\0A\0A Error: File cannot be opened\00"
@.str.3 = [30 x i8] c"\0A\0A File opened successfully\0A\0A\00"
@.str.4 = [31 x i8] c"\0A\0A File has been now closed \0A\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32*
store i32 0, i32* %1
%3 = 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* %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 ([32 x i8], [32 x i8]* @.str.2, i64 0, i64 0))
br label %13
8: ; preds = %0
%9 = call i32 @printf(i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str.3, i64 0, i64 0))
%10 = load i32*, i32** %2
%11 = call i32 @fclose(i32* %10)
%12 = call i32 @printf(i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str.4, i64 0, i64 0))
br label %13
13: ; preds = %8, %6
%14 = load i32, i32* %1
ret i32 %14
}

LLVM IR (-O2):
@.str = [8 x i8] c"prog1.c\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [32 x i8] c"\0A\0A Error: File cannot be opened\00"
@str = [29 x i8] c"\0A\0A File opened successfully\0A\00"
@str.5 = [30 x i8] c"\0A\0A File has been now closed \0A\00"
define i32 @main() {
%1 = 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))
%2 = icmp eq i32* %1, null
br i1 %2, label %3, label %5
3: ; preds = %0
%4 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([32 x i8], [32 x i8]* @.str.2, i64 0, i64 0))
br label %9
5: ; preds = %0
%6 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([29 x i8], [29 x i8]* @str, i64 0, i64 0))
%7 = tail call i32 @fclose(i32* %1)
%8 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([30 x i8], [30 x i8]* @str.5, i64 0, i64 0))
br label %9
9: ; preds = %5, %3
ret i32 0
}