#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(void) {
  int year;
  printf("Enter the year to be tested: ");
  scanf("%i", &year);
  if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
    printf("It's a leap year.\n");
  } else {
    printf("Nope, it's not a leap year.\n");
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
call   1030 <printf@plt>
lea    0xedc(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0x8(%rbp),%eax
mov    $0x4,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    1173 <main+0x53>
mov    -0x8(%rbp),%eax
mov    $0x64,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    1187 <main+0x67>
mov    -0x8(%rbp),%eax
mov    $0x190,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    1198 <main+0x78>
lea    0xe93(%rip),%rdi
call   1030 <printf@plt>
jmp    11a4 <main+0x84>
lea    0xe95(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xec8(%rip),%rdi
call   1040 <printf@plt>
lea    0xeda(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1050 <scanf@plt>
mov    0x4(%rsp),%eax
imul   $0xc28f5c29,%eax,%ecx
add    $0x51eb850,%ecx
mov    %ecx,%edx
ror    $0x2,%edx
ror    $0x4,%ecx
cmp    $0xa3d70b,%ecx
lea    0xeca(%rip),%rdi
lea    0xea7(%rip),%rcx
cmovb  %rdi,%rcx
cmp    $0x28f5c29,%edx
cmovb  %rcx,%rdi
test   $0x3,%al
cmovne %rcx,%rdi
call   1030 <puts@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [30 x i8] c"Enter the year to be tested: \00"
@.str.1 = [3 x i8] c"%i\00"
@.str.2 = [19 x i8] c"It's a leap year.\0A\00"
@.str.3 = [29 x i8] c"Nope, it's not a leap year.\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
store i32 0, i32* %1
%3 = call i32 @printf(i8* getelementptr inbounds ([30 x i8], [30 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 %12
8: ; preds = %0
%9 = load i32, i32* %2
%10 = srem i32 %9, 100
%11 = icmp ne i32 %10, 0
br i1 %11, label %16, label %12
12: ; preds = %8, %0
%13 = load i32, i32* %2
%14 = srem i32 %13, 400
%15 = icmp eq i32 %14, 0
br i1 %15, label %16, label %18
16: ; preds = %12, %8
%17 = call i32 @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0))
br label %20
18: ; preds = %12
%19 = call i32 @printf(i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str.3, i64 0, i64 0))
br label %20
20: ; preds = %18, %16
ret i32 0
}

LLVM IR (-O2):
@.str = [30 x i8] c"Enter the year to be tested: \00"
@.str.1 = [3 x i8] c"%i\00"
@str = [28 x i8] c"Nope, it's not a leap year.\00"
@str.4 = [18 x i8] c"It's a leap year.\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([30 x i8], [30 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
%8 = srem i32 %5, 100
%9 = icmp ne i32 %8, 0
%10 = and i1 %7, %9
%11 = srem i32 %5, 400
%12 = icmp eq i32 %11, 0
%13 = select i1 %10, i1 true, i1 %12
%14 = select i1 %13, i8* getelementptr inbounds ([18 x i8], [18 x i8]* @str.4, i64 0, i64 0), i8* getelementptr inbounds ([28 x i8], [28 x i8]* @str, i64 0, i64 0)
%15 = call i32 @puts(i8* dereferenceable(1) %14)
ret i32 0
}