#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 year;
  printf("Enter a year: ");
  scanf("%d", &year);
  if (year % 4 == 0) {
    if (year % 100 == 0) {
      if (year % 400 == 0)
        printf("%d is a leap year.", year);
      else
        printf("%d is not a leap year.", year);
    } else
      printf("%d is a leap year.", year);
  } else
    printf("%d is not a leap year.", year);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xecb(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0x8(%rbp),%eax
mov    $0x4,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    11cb <main+0xab>
mov    -0x8(%rbp),%eax
mov    $0x64,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    11b5 <main+0x95>
mov    -0x8(%rbp),%eax
mov    $0x190,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    119f <main+0x7f>
mov    -0x8(%rbp),%esi
lea    0xe7f(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    11b0 <main+0x90>
mov    -0x8(%rbp),%esi
lea    0xe7c(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    11c6 <main+0xa6>
mov    -0x8(%rbp),%esi
lea    0xe53(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    11dc <main+0xbc>
mov    -0x8(%rbp),%esi
lea    0xe50(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xed8(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xed9(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1040 <scanf@plt>
mov    0x4(%rsp),%esi
test   $0x3,%sil
je     1153 <main+0x33>
lea    0xed4(%rip),%rdi
jmp    118e <main+0x6e>
imul   $0xc28f5c29,%esi,%eax
add    $0x51eb850,%eax
mov    %eax,%ecx
ror    $0x2,%ecx
cmp    $0x28f5c28,%ecx
jbe    1174 <main+0x54>
lea    0xea0(%rip),%rdi
jmp    118e <main+0x6e>
ror    $0x4,%eax
cmp    $0xa3d70b,%eax
lea    0xe8f(%rip),%rax
lea    0xe9b(%rip),%rdi
cmovb  %rax,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [15 x i8] c"Enter a year: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [19 x i8] c"%d is a leap year.\00"
@.str.3 = [23 x i8] c"%d is not a leap year.\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
store i32 0, i32* %1
%3 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([15 x i8], [15 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* %2)
%5 = load i32, i32* %2
%6 = srem i32 %5, 4
%7 = icmp eq i32 %6, 0
br i1 %7, label %8, label %27
8: ; preds = %0
%9 = load i32, i32* %2
%10 = srem i32 %9, 100
%11 = icmp eq i32 %10, 0
br i1 %11, label %12, label %23
12: ; preds = %8
%13 = load i32, i32* %2
%14 = srem i32 %13, 400
%15 = icmp eq i32 %14, 0
br i1 %15, label %16, label %19
16: ; preds = %12
%17 = load i32, i32* %2
%18 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0), i32 %17)
br label %22
19: ; preds = %12
%20 = load i32, i32* %2
%21 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.3, i64 0, i64 0), i32 %20)
br label %22
22: ; preds = %19, %16
br label %26
23: ; preds = %8
%24 = load i32, i32* %2
%25 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0), i32 %24)
br label %26
26: ; preds = %23, %22
br label %30
27: ; preds = %0
%28 = load i32, i32* %2
%29 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.3, i64 0, i64 0), i32 %28)
br label %30
30: ; preds = %27, %26
ret i32 0
}

LLVM IR (-O2):
@.str = [15 x i8] c"Enter a year: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [19 x i8] c"%d is a leap year.\00"
@.str.3 = [23 x i8] c"%d is not a leap year.\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([15 x i8], [15 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 = and i32 %5, 3
%7 = icmp eq i32 %6, 0
br i1 %7, label %8, label %15
8: ; preds = %0
%9 = srem i32 %5, 100
%10 = icmp eq i32 %9, 0
br i1 %10, label %11, label %15
11: ; preds = %8
%12 = srem i32 %5, 400
%13 = icmp eq i32 %12, 0
%14 = select i1 %13, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.3, i64 0, i64 0)
br label %15
15: ; preds = %0, %8, %11
%16 = phi i8* [ %14, %11 ], [ getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0), %8 ], [ getelementptr inbounds ([23 x i8], [23 x i8]* @.str.3, i64 0, i64 0), %0 ]
%17 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) %16, i32 %5)
ret i32 0
}