#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 rev(int, int);
int /*<<< orphan*/ scanf(char *, int *);
int main() {
  int num, result;
  int length = 0, temp;
  printf("Enter an integer number : ");
  scanf("%d", &num);
  temp = num;
  while (temp != 0) {
    length++;
    temp = temp / 10;
  }
  result = rev(num, length);
  if (result == num)
    printf("palindrome");
  else
    printf("not a palindrome");
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0x10(%rbp)
lea    0xeb3(%rip),%rdi
call   1040 <printf@plt>
lea    0xec2(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1050 <scanf@plt>
mov    -0x8(%rbp),%eax
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
je     118e <main+0x5e>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
mov    -0x14(%rbp),%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
mov    %eax,-0x14(%rbp)
jmp    1168 <main+0x38>
mov    -0x8(%rbp),%edi
mov    -0x10(%rbp),%esi
call   1030 <rev@plt>
mov    %eax,-0xc(%rbp)
mov    -0xc(%rbp),%eax
cmp    -0x8(%rbp),%eax
jne    11b9 <main+0x89>
lea    0xe75(%rip),%rdi
call   1040 <printf@plt>
jmp    11c5 <main+0x95>
lea    0xe5e(%rip),%rdi
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xec8(%rip),%rdi
call   1040 <printf@plt>
lea    0xed7(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1050 <scanf@plt>
mov    0x4(%rsp),%edi
xor    %esi,%esi
test   %edi,%edi
je     1182 <main+0x52>
mov    %edi,%eax
nopw   0x0(%rax,%rax,1)
add    $0x1,%esi
movslq %eax,%rcx
imul   $0x66666667,%rcx,%rax
mov    %rax,%rdx
shr    $0x3f,%rdx
sar    $0x22,%rax
add    %edx,%eax
add    $0x9,%ecx
cmp    $0x12,%ecx
ja     1160 <main+0x30>
call   1030 <rev@plt>
cmp    0x4(%rsp),%eax
lea    0xe92(%rip),%rax
lea    0xe85(%rip),%rdi
cmove  %rax,%rdi
call   1040 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

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

LLVM IR (-O2):
@.str = [27 x i8] c"Enter an integer number : \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [11 x i8] c"palindrome\00"
@.str.3 = [17 x i8] c"not a palindrome\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([27 x i8], [27 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 %14, label %7
7: ; preds = %0, %7
%8 = phi i32 [ %11, %7 ], [ %5, %0 ]
%9 = phi i32 [ %10, %7 ], [ 0, %0 ]
%10 = add nuw nsw i32 %9, 1
%11 = sdiv i32 %8, 10
%12 = add i32 %8, 9
%13 = icmp ult i32 %12, 19
br i1 %13, label %14, label %7
14: ; preds = %7, %0
%15 = phi i32 [ 0, %0 ], [ %10, %7 ]
%16 = call i32 @rev(i32 %5, i32 %15)
%17 = load i32, i32* %1
%18 = icmp eq i32 %16, %17
%19 = select i1 %18, i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.3, i64 0, i64 0)
%20 = call i32 @printf(i8* dereferenceable(1) %19)
ret i32 0
}