#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 */

/* Variables and functions */
int EXIT_SUCCESS;
int /*<<< orphan*/ getchar();
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, char *);
char *string_oposta(char *);
int main() {
  char str[20];
  char *p;
  printf("Digite a palavra: ");
  scanf("%s", str);
  getchar();
  p = string_oposta(str);
  printf("Antiga: %s\nNova: %s ", str, p);
  return (EXIT_SUCCESS);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeaa(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x20(%rbp),%rsi
lea    0xeab(%rip),%rdi
call   1060 <scanf@plt>
mov    $0x0,%al
call   1050 <getchar@plt>
lea    -0x20(%rbp),%rdi
call   1040 <string_oposta@plt>
mov    %rax,-0x28(%rbp)
lea    -0x20(%rbp),%rsi
mov    -0x28(%rbp),%rdx
lea    0xe86(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    0x2e42(%rip),%rax
mov    (%rax),%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x20,%rsp
lea    0xeb4(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xeb9(%rip),%rdi
mov    %rsp,%rbx
mov    %rbx,%rsi
call   1060 <scanf@plt>
xor    %eax,%eax
call   1050 <getchar@plt>
mov    %rbx,%rdi
call   1040 <string_oposta@plt>
lea    0xe9b(%rip),%rdi
mov    %rbx,%rsi
mov    %rax,%rdx
xor    %eax,%eax
call   1030 <printf@plt>
mov    0x2e51(%rip),%rax
mov    (%rax),%eax
add    $0x20,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [19 x i8] c"Digite a palavra: \00"
@.str.1 = [3 x i8] c"%s\00"
@.str.2 = [21 x i8] c"Antiga: %s\0ANova: %s \00"
@EXIT_SUCCESS = global i32 0
define i32 @main() {
%1 = alloca i32
%2 = alloca [20 x i8]
%3 = alloca i8*
store i32 0, i32* %1
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str, i64 0, i64 0))
%5 = getelementptr inbounds [20 x i8], [20 x i8]* %2, i64 0, i64 0
%6 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %5)
%7 = call i32 (...) @getchar()
%8 = getelementptr inbounds [20 x i8], [20 x i8]* %2, i64 0, i64 0
%9 = call i8* @string_oposta(i8* %8)
store i8* %9, i8** %3
%10 = getelementptr inbounds [20 x i8], [20 x i8]* %2, i64 0, i64 0
%11 = load i8*, i8** %3
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.2, i64 0, i64 0), i8* %10, i8* %11)
%13 = load i32, i32* @EXIT_SUCCESS
ret i32 %13
}

LLVM IR (-O2):
@.str = [19 x i8] c"Digite a palavra: \00"
@.str.1 = [3 x i8] c"%s\00"
@.str.2 = [21 x i8] c"Antiga: %s\0ANova: %s \00"
@EXIT_SUCCESS = global i32 0
define i32 @main() {
%1 = alloca [20 x i8]
%2 = getelementptr inbounds [20 x i8], [20 x i8]* %1, i64 0, i64 0
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([19 x i8], [19 x i8]* @.str, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %2)
%5 = call i32 (...) @getchar()
%6 = call i8* @string_oposta(i8* %2)
%7 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([21 x i8], [21 x i8]* @.str.2, i64 0, i64 0), i8* %2, i8* %6)
%8 = load i32, i32* @EXIT_SUCCESS
ret i32 %8
}