#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 num;
  printf("Enter a number: ");
  scanf("%d", &num);
  for (int i = 2; i * i <= num; i += 2) {
    printf("%d\n", i * i);
  }
  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    0xecd(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
movl   $0x2,-0xc(%rbp)
mov    -0xc(%rbp),%eax
imul   -0xc(%rbp),%eax
cmp    -0x8(%rbp),%eax
jg     1187 <main+0x67>
mov    -0xc(%rbp),%esi
imul   -0xc(%rbp),%esi
lea    0xea2(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0xc(%rbp),%eax
add    $0x2,%eax
mov    %eax,-0xc(%rbp)
jmp    1154 <main+0x34>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %rbx
push   %rax
lea    0xed6(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xed9(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1040 <scanf@plt>
cmpl   $0x4,0x4(%rsp)
jl     1178 <main+0x58>
mov    $0x4,%ebp
lea    0xebf(%rip),%rbx
mov    $0x4,%esi
nopw   0x0(%rax,%rax,1)
mov    %rbx,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    %ebp,%esi
imul   %ebp,%esi
add    $0x2,%ebp
cmp    0x4(%rsp),%esi
jle    1160 <main+0x40>
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 = [4 x i8] c"%d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0))
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
store i32 2, i32* %3
br label %6
6: ; preds = %17, %0
%7 = load i32, i32* %3
%8 = load i32, i32* %3
%9 = mul nsw i32 %7, %8
%10 = load i32, i32* %2
%11 = icmp sle i32 %9, %10
br i1 %11, label %12, label %20
12: ; preds = %6
%13 = load i32, i32* %3
%14 = load i32, i32* %3
%15 = mul nsw i32 %13, %14
%16 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i32 %15)
br label %17
17: ; preds = %12
%18 = load i32, i32* %3
%19 = add nsw i32 %18, 2
store i32 %19, i32* %3
br label %6
20: ; preds = %6
ret i32 0
}

LLVM IR (-O2):
@.str = [17 x i8] c"Enter a number: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [4 x i8] c"%d\0A\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 slt i32 %5, 4
br i1 %6, label %7, label %8
7: ; preds = %8, %0
ret i32 0
8: ; preds = %0, %8
%9 = phi i32 [ %13, %8 ], [ 4, %0 ]
%10 = phi i32 [ %12, %8 ], [ 2, %0 ]
%11 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i32 %9)
%12 = add nuw nsw i32 %10, 2
%13 = mul nsw i32 %12, %12
%14 = load i32, i32* %1
%15 = icmp sgt i32 %13, %14
br i1 %15, label %7, label %8
}