#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*/ fgets(char *, int, int /*<<< orphan*/);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ stdin;
int strlen(char *);
int main() {
  char a[10000], b;
  printf("\nVavedi tekst:");
  fgets(a, sizeof a, stdin);
  int i, l;
  l = strlen(a) - 1;
  for (i = 0; i < l; i++, l--) {
    b = a[i];
    a[i] = a[l];
    a[l] = b;
  }
  printf("%s\n", a);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x2730,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeb7(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    -0x2720(%rbp),%rdi
mov    0x2e8a(%rip),%rax
mov    (%rax),%edx
mov    $0x2710,%esi
call   1050 <fgets@plt>
lea    -0x2720(%rbp),%rdi
call   1030 <strlen@plt>
sub    $0x1,%eax
mov    %eax,-0x272c(%rbp)
movl   $0x0,-0x2728(%rbp)
mov    -0x2728(%rbp),%eax
cmp    -0x272c(%rbp),%eax
jge    1202 <main+0xd2>
movslq -0x2728(%rbp),%rax
mov    -0x2720(%rbp,%rax,1),%al
mov    %al,-0x2721(%rbp)
movslq -0x272c(%rbp),%rax
mov    -0x2720(%rbp,%rax,1),%cl
movslq -0x2728(%rbp),%rax
mov    %cl,-0x2720(%rbp,%rax,1)
mov    -0x2721(%rbp),%cl
movslq -0x272c(%rbp),%rax
mov    %cl,-0x2720(%rbp,%rax,1)
mov    -0x2728(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x2728(%rbp)
mov    -0x272c(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,-0x272c(%rbp)
jmp    1189 <main+0x59>
lea    -0x2720(%rbp),%rsi
lea    0xdff(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x2730,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x2710,%rsp
lea    0xeb1(%rip),%rdi
xor    %eax,%eax
call   1050 <printf@plt>
mov    0x2e8b(%rip),%rax
mov    (%rax),%edx
mov    %rsp,%rbx
mov    %rbx,%rdi
mov    $0x2710,%esi
call   1060 <fgets@plt>
mov    %rbx,%rdi
call   1040 <strlen@plt>
cmp    $0x2,%eax
jl     11b0 <main+0x70>
mov    %eax,%eax
add    $0xfffffffffffffffe,%rax
xor    %ecx,%ecx
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
movzbl (%rsp,%rcx,1),%edx
movzbl 0x1(%rsp,%rax,1),%ebx
mov    %bl,(%rsp,%rcx,1)
mov    %dl,0x1(%rsp,%rax,1)
add    $0x1,%rcx
lea    -0x1(%rax),%rdx
cmp    %rax,%rcx
mov    %rdx,%rax
jl     1190 <main+0x50>
mov    %rsp,%rdi
call   1030 <puts@plt>
xor    %eax,%eax
add    $0x2710,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [15 x i8] c"\0AVavedi tekst:\00"
@stdin = global i32 0
@.str.1 = [4 x i8] c"%s\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca [10000 x i8]
%3 = alloca i8
%4 = alloca i32
%5 = alloca i32
store i32 0, i32* %1
%6 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i64 0, i64 0))
%7 = getelementptr inbounds [10000 x i8], [10000 x i8]* %2, i64 0, i64 0
%8 = load i32, i32* @stdin
%9 = call i32 @fgets(i8* %7, i32 10000, i32 %8)
%10 = getelementptr inbounds [10000 x i8], [10000 x i8]* %2, i64 0, i64 0
%11 = call i32 @strlen(i8* %10)
%12 = sub nsw i32 %11, 1
store i32 %12, i32* %5
store i32 0, i32* %4
br label %13
13: ; preds = %33, %0
%14 = load i32, i32* %4
%15 = load i32, i32* %5
%16 = icmp slt i32 %14, %15
br i1 %16, label %17, label %38
17: ; preds = %13
%18 = load i32, i32* %4
%19 = sext i32 %18 to i64
%20 = getelementptr inbounds [10000 x i8], [10000 x i8]* %2, i64 0, i64 %19
%21 = load i8, i8* %20
store i8 %21, i8* %3
%22 = load i32, i32* %5
%23 = sext i32 %22 to i64
%24 = getelementptr inbounds [10000 x i8], [10000 x i8]* %2, i64 0, i64 %23
%25 = load i8, i8* %24
%26 = load i32, i32* %4
%27 = sext i32 %26 to i64
%28 = getelementptr inbounds [10000 x i8], [10000 x i8]* %2, i64 0, i64 %27
store i8 %25, i8* %28
%29 = load i8, i8* %3
%30 = load i32, i32* %5
%31 = sext i32 %30 to i64
%32 = getelementptr inbounds [10000 x i8], [10000 x i8]* %2, i64 0, i64 %31
store i8 %29, i8* %32
br label %33
33: ; preds = %17
%34 = load i32, i32* %4
%35 = add nsw i32 %34, 1
store i32 %35, i32* %4
%36 = load i32, i32* %5
%37 = add nsw i32 %36, -1
store i32 %37, i32* %5
br label %13
38: ; preds = %13
%39 = getelementptr inbounds [10000 x i8], [10000 x i8]* %2, i64 0, i64 0
%40 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8* %39)
ret i32 0
}

LLVM IR (-O2):
@.str = [15 x i8] c"\0AVavedi tekst:\00"
@stdin = global i32 0
define i32 @main() {
%1 = alloca [10000 x i8]
%2 = getelementptr inbounds [10000 x i8], [10000 x i8]* %1, i64 0, i64 0
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i64 0, i64 0))
%4 = load i32, i32* @stdin
%5 = call i32 @fgets(i8* %2, i32 10000, i32 %4)
%6 = call i32 @strlen(i8* %2)
%7 = icmp sgt i32 %6, 1
br i1 %7, label %8, label %21
8: ; preds = %0
%9 = zext i32 %6 to i64
%10 = add nsw i64 %9, -1
br label %11
11: ; preds = %8, %11
%12 = phi i64 [ 0, %8 ], [ %18, %11 ]
%13 = phi i64 [ %10, %8 ], [ %19, %11 ]
%14 = getelementptr inbounds [10000 x i8], [10000 x i8]* %1, i64 0, i64 %12
%15 = load i8, i8* %14
%16 = getelementptr inbounds [10000 x i8], [10000 x i8]* %1, i64 0, i64 %13
%17 = load i8, i8* %16
store i8 %17, i8* %14
store i8 %15, i8* %16
%18 = add nuw nsw i64 %12, 1
%19 = add nsw i64 %13, -1
%20 = icmp slt i64 %18, %19
br i1 %20, label %11, label %21
21: ; preds = %11, %0
%22 = call i32 @puts(i8* %2)
ret i32 0
}