#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 *, char *);
int /*<<< orphan*/ scanf(char *, char *);
int main() {
  char word[81], re_word[81];
  printf("\nType in a word: ");
  scanf("%80s", word);
  reverse(word, re_word);
  printf("The reverse string is: %s", re_word);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0xc0,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeb7(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    -0x60(%rbp),%rsi
lea    0xeb7(%rip),%rdi
call   1050 <scanf@plt>
lea    -0x60(%rbp),%rdi
lea    -0xc0(%rbp),%rsi
call   1030 <reverse@plt>
lea    -0xc0(%rbp),%rsi
lea    0xe99(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
xor    %eax,%eax
add    $0xc0,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
sub    $0xb8,%rsp
lea    0xebf(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xec3(%rip),%rdi
lea    0x60(%rsp),%rbx
mov    %rbx,%rsi
call   1050 <scanf@plt>
mov    %rsp,%r14
mov    %rbx,%rdi
mov    %r14,%rsi
call   1030 <reverse@plt>
lea    0xea6(%rip),%rdi
mov    %r14,%rsi
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
add    $0xb8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [18 x i8] c"\0AType in a word: \00"
@.str.1 = [5 x i8] c"%80s\00"
@.str.2 = [26 x i8] c"The reverse string is: %s\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca [81 x i8]
%3 = alloca [81 x i8]
store i32 0, i32* %1
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str, i64 0, i64 0))
%5 = getelementptr inbounds [81 x i8], [81 x i8]* %2, i64 0, i64 0
%6 = call i32 @scanf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i8* %5)
%7 = getelementptr inbounds [81 x i8], [81 x i8]* %2, i64 0, i64 0
%8 = getelementptr inbounds [81 x i8], [81 x i8]* %3, i64 0, i64 0
%9 = call i32 @reverse(i8* %7, i8* %8)
%10 = getelementptr inbounds [81 x i8], [81 x i8]* %3, i64 0, i64 0
%11 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.2, i64 0, i64 0), i8* %10)
ret i32 0
}

LLVM IR (-O2):
@.str = [18 x i8] c"\0AType in a word: \00"
@.str.1 = [5 x i8] c"%80s\00"
@.str.2 = [26 x i8] c"The reverse string is: %s\00"
define i32 @main() {
%1 = alloca [81 x i8]
%2 = alloca [81 x i8]
%3 = getelementptr inbounds [81 x i8], [81 x i8]* %1, i64 0, i64 0
%4 = getelementptr inbounds [81 x i8], [81 x i8]* %2, i64 0, i64 0
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([18 x i8], [18 x i8]* @.str, i64 0, i64 0))
%6 = call i32 @scanf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i8* %3)
%7 = call i32 @reverse(i8* %3, i8* %4)
%8 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([26 x i8], [26 x i8]* @.str.2, i64 0, i64 0), i8* %4)
ret i32 0
}