#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*/ exit(int);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ printf(char *, char *);
FILE *AbrirArquivoEntrada() {
  FILE *arqEntrada = fopen("nome.txt", "r");
  if (arqEntrada == NULL) {
    printf("%s\n", "Falha ao abrir o arquivo");
    exit(1);
  } else {
    printf("%s\n", "Arquivo aberto com sucesso");
    return arqEntrada;
  }
}


x86 assembly (clang, -O0):
<AbrirArquivoEntrada>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
lea    0xec1(%rip),%rdi
lea    0xec3(%rip),%rsi
call   1040 <fopen@plt>
mov    %rax,-0x8(%rbp)
cmpq   $0x0,-0x8(%rbp)
jne    1177 <AbrirArquivoEntrada+0x47>
lea    0xeaa(%rip),%rdi
lea    0xea7(%rip),%rsi
call   1030 <printf@plt>
mov    $0x1,%edi
call   1050 <exit@plt>
lea    0xe8d(%rip),%rdi
lea    0xea3(%rip),%rsi
call   1030 <printf@plt>
mov    -0x8(%rbp),%rax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<AbrirArquivoEntrada>:
push   %rbx
lea    0xec8(%rip),%rdi
lea    0xeca(%rip),%rsi
call   1040 <fopen@plt>
test   %rax,%rax
je     1164 <AbrirArquivoEntrada+0x34>
mov    %rax,%rbx
lea    0xeb8(%rip),%rdi
lea    0xece(%rip),%rsi
call   1030 <printf@plt>
mov    %rbx,%rax
pop    %rbx
ret
lea    0xea0(%rip),%rdi
lea    0xe9d(%rip),%rsi
call   1030 <printf@plt>
mov    $0x1,%edi
call   1050 <exit@plt>

LLVM IR (-O0):
@.str = [9 x i8] c"nome.txt\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [4 x i8] c"%s\0A\00"
@.str.3 = [25 x i8] c"Falha ao abrir o arquivo\00"
@.str.4 = [27 x i8] c"Arquivo aberto com sucesso\00"
define i32* @AbrirArquivoEntrada() {
%1 = alloca i32*
%2 = call i32* @fopen(i8* getelementptr inbounds ([9 x i8], [9 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 %8
5: ; preds = %0
%6 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.3, i64 0, i64 0))
%7 = call i32 @exit(i32 1)
unreachable
8: ; preds = %0
%9 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.4, i64 0, i64 0))
%10 = load i32*, i32** %1
ret i32* %10
}

LLVM IR (-O2):
@.str = [9 x i8] c"nome.txt\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [4 x i8] c"%s\0A\00"
@.str.3 = [25 x i8] c"Falha ao abrir o arquivo\00"
@.str.4 = [27 x i8] c"Arquivo aberto com sucesso\00"
define noalias i32* @AbrirArquivoEntrada() {
%1 = tail call i32* @fopen(i8* getelementptr inbounds ([9 x i8], [9 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 %6
3: ; preds = %0
%4 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.3, i64 0, i64 0))
%5 = tail call i32 @exit(i32 1)
unreachable
6: ; preds = %0
%7 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.4, i64 0, i64 0))
ret i32* %1
}