#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*/ scanf(char *, int *);
int main() {
  int number, numberCopy, reverse = 0;
  printf("Enter a number: ");
  scanf("%d", &number);
  numberCopy = number;
  while (number) {
    reverse = 10 * reverse + number % 10;
    number = number / 10;
  }
  printf("Reverse: %d\n", reverse);
  if (reverse == numberCopy)
    printf("Its a palindrome\n");
  else
    printf("Not a palindrome\n");
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0x10(%rbp)
lea    0xec3(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xec6(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0x8(%rbp),%eax
mov    %eax,-0xc(%rbp)
cmpl   $0x0,-0x8(%rbp)
je     1191 <main+0x71>
imul   $0xa,-0x10(%rbp),%eax
mov    %eax,-0x14(%rbp)
mov    -0x8(%rbp),%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
mov    -0x14(%rbp),%eax
add    %edx,%eax
mov    %eax,-0x10(%rbp)
mov    -0x8(%rbp),%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
mov    %eax,-0x8(%rbp)
jmp    115a <main+0x3a>
mov    -0x10(%rbp),%esi
lea    0xe79(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x10(%rbp),%eax
cmp    -0xc(%rbp),%eax
jne    11c1 <main+0xa1>
lea    0xe6c(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    11cf <main+0xaf>
lea    0xe6b(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %rbx
push   %rax
lea    0xec6(%rip),%rdi
xor    %ebx,%ebx
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xec7(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1050 <scanf@plt>
mov    0x4(%rsp),%ebp
test   %ebp,%ebp
je     1193 <main+0x63>
xor    %ebx,%ebx
mov    %ebp,%eax
lea    (%rbx,%rbx,4),%ecx
movslq %eax,%rdx
imul   $0x66666667,%rdx,%rax
mov    %rax,%rsi
shr    $0x3f,%rsi
sar    $0x22,%rax
add    %esi,%eax
lea    (%rax,%rax,1),%esi
lea    (%rsi,%rsi,4),%esi
mov    %edx,%edi
sub    %esi,%edi
lea    (%rdi,%rcx,2),%ebx
add    $0x9,%edx
cmp    $0x12,%edx
ja     1160 <main+0x30>
mov    %eax,0x4(%rsp)
lea    0xe7a(%rip),%rdi
mov    %ebx,%esi
xor    %eax,%eax
call   1040 <printf@plt>
cmp    %ebp,%ebx
lea    0xe86(%rip),%rax
lea    0xe6e(%rip),%rdi
cmove  %rax,%rdi
call   1030 <puts@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [17 x i8] c"Enter a number: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [13 x i8] c"Reverse: %d\0A\00"
@.str.3 = [18 x i8] c"Its a palindrome\0A\00"
@.str.4 = [18 x i8] c"Not a palindrome\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
store i32 0, i32* %1
store i32 0, i32* %4
%5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0))
%6 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%7 = load i32, i32* %2
store i32 %7, i32* %3
br label %8
8: ; preds = %11, %0
%9 = load i32, i32* %2
%10 = icmp ne i32 %9, 0
br i1 %10, label %11, label %19
11: ; preds = %8
%12 = load i32, i32* %4
%13 = mul nsw i32 10, %12
%14 = load i32, i32* %2
%15 = srem i32 %14, 10
%16 = add nsw i32 %13, %15
store i32 %16, i32* %4
%17 = load i32, i32* %2
%18 = sdiv i32 %17, 10
store i32 %18, i32* %2
br label %8
19: ; preds = %8
%20 = load i32, i32* %4
%21 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), i32 %20)
%22 = load i32, i32* %4
%23 = load i32, i32* %3
%24 = icmp eq i32 %22, %23
br i1 %24, label %25, label %27
25: ; preds = %19
%26 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.3, i64 0, i64 0))
br label %29
27: ; preds = %19
%28 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.4, i64 0, i64 0))
br label %29
29: ; preds = %27, %25
%30 = load i32, i32* %1
ret i32 %30
}

LLVM IR (-O2):
@.str = [17 x i8] c"Enter a number: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [13 x i8] c"Reverse: %d\0A\00"
@str = [17 x i8] c"Not a palindrome\00"
@str.5 = [17 x i8] c"Its a palindrome\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 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), i32* %1)
%5 = load i32, i32* %1
%6 = icmp eq i32 %5, 0
br i1 %6, label %17, label %7
7: ; preds = %0, %7
%8 = phi i32 [ %12, %7 ], [ 0, %0 ]
%9 = phi i32 [ %13, %7 ], [ %5, %0 ]
%10 = mul nsw i32 %8, 10
%11 = srem i32 %9, 10
%12 = add nsw i32 %10, %11
%13 = sdiv i32 %9, 10
%14 = add i32 %9, 9
%15 = icmp ult i32 %14, 19
br i1 %15, label %16, label %7
16: ; preds = %7
store i32 %13, i32* %1
br label %17
17: ; preds = %16, %0
%18 = phi i32 [ %12, %16 ], [ 0, %0 ]
%19 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), i32 %18)
%20 = icmp eq i32 %18, %5
%21 = select i1 %20, i8* getelementptr inbounds ([17 x i8], [17 x i8]* @str.5, i64 0, i64 0), i8* getelementptr inbounds ([17 x i8], [17 x i8]* @str, i64 0, i64 0)
%22 = call i32 @puts(i8* dereferenceable(1) %21)
ret i32 0
}