#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 /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ reverse(char *);
int /*<<< orphan*/ scanf(char *, char *);
int main() {
  char str[200];
  printf("Enter a word to be reversed : ");
  scanf("%s", str);
  printf("Entered Word :: %s \n", str);
  reverse(str);
  printf("Reversed  Word :: %s \n", str);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0xd0,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeb7(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    -0xd0(%rbp),%rsi
lea    0xec1(%rip),%rdi
call   1050 <scanf@plt>
lea    -0xd0(%rbp),%rsi
lea    0xeb1(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    -0xd0(%rbp),%rdi
call   1030 <reverse@plt>
lea    -0xd0(%rbp),%rsi
lea    0xea5(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
xor    %eax,%eax
add    $0xd0,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0xd0,%rsp
lea    0xec1(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xed2(%rip),%rdi
mov    %rsp,%rbx
mov    %rbx,%rsi
call   1050 <scanf@plt>
lea    0xec3(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
call   1030 <reverse@plt>
lea    0xebf(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
add    $0xd0,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [31 x i8] c"Enter a word to be reversed : \00"
@.str.1 = [3 x i8] c"%s\00"
@.str.2 = [21 x i8] c"Entered Word :: %s \0A\00"
@.str.3 = [23 x i8] c"Reversed Word :: %s \0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca [200 x i8]
store i32 0, i32* %1
%3 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str, i64 0, i64 0))
%4 = getelementptr inbounds [200 x i8], [200 x i8]* %2, i64 0, i64 0
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %4)
%6 = getelementptr inbounds [200 x i8], [200 x i8]* %2, i64 0, i64 0
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.2, i64 0, i64 0), i8* %6)
%8 = getelementptr inbounds [200 x i8], [200 x i8]* %2, i64 0, i64 0
%9 = call i32 @reverse(i8* %8)
%10 = getelementptr inbounds [200 x i8], [200 x i8]* %2, i64 0, i64 0
%11 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.3, i64 0, i64 0), i8* %10)
ret i32 0
}

LLVM IR (-O2):
@.str = [31 x i8] c"Enter a word to be reversed : \00"
@.str.1 = [3 x i8] c"%s\00"
@.str.2 = [21 x i8] c"Entered Word :: %s \0A\00"
@.str.3 = [23 x i8] c"Reversed Word :: %s \0A\00"
define i32 @main() {
%1 = alloca [200 x i8]
%2 = getelementptr inbounds [200 x i8], [200 x i8]* %1, i64 0, i64 0
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([31 x i8], [31 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 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([21 x i8], [21 x i8]* @.str.2, i64 0, i64 0), i8* %2)
%6 = call i32 @reverse(i8* %2)
%7 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([23 x i8], [23 x i8]* @.str.3, i64 0, i64 0), i8* %2)
ret i32 0
}