#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 upper_limit = 0;
  printf("enter a upper_limit number:\n");
  scanf("%d", &upper_limit);
  for (int i = 1; i <= upper_limit / 2; i++) {
    printf("%d\n", 4 * i * i);
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0x8(%rbp)
lea    0xec3(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xed2(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
movl   $0x1,-0xc(%rbp)
mov    -0xc(%rbp),%eax
mov    %eax,-0x10(%rbp)
mov    -0x8(%rbp),%eax
mov    $0x2,%ecx
cltd
idiv   %ecx
mov    %eax,%ecx
mov    -0x10(%rbp),%eax
cmp    %ecx,%eax
jg     119f <main+0x7f>
mov    -0xc(%rbp),%esi
shl    $0x2,%esi
imul   -0xc(%rbp),%esi
lea    0xe96(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    115b <main+0x3b>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r14
push   %rbx
sub    $0x10,%rsp
movl   $0x0,0xc(%rsp)
lea    0xec0(%rip),%rdi
call   1030 <puts@plt>
lea    0xead(%rip),%rdi
lea    0xc(%rsp),%rsi
call   1050 <scanf@plt>
cmpl   $0x2,0xc(%rsp)
jl     11a6 <main+0x76>
mov    $0x4,%ebp
lea    0xe93(%rip),%r14
xor    %ebx,%ebx
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax)
add    $0x1,%ebx
mov    %ebp,%esi
imul   %ebx,%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0xc(%rsp),%eax
mov    %eax,%ecx
shr    $0x1f,%ecx
add    %eax,%ecx
sar    %ecx
add    $0x4,%ebp
cmp    %ecx,%ebx
jl     1180 <main+0x50>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r14
pop    %rbp
ret

LLVM IR (-O0):
@.str = [29 x i8] c"enter a upper_limit number:\0A\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
store i32 0, i32* %2
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([29 x i8], [29 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 1, i32* %3
br label %6
6: ; preds = %17, %0
%7 = load i32, i32* %3
%8 = load i32, i32* %2
%9 = sdiv i32 %8, 2
%10 = icmp sle i32 %7, %9
br i1 %10, label %11, label %20
11: ; preds = %6
%12 = load i32, i32* %3
%13 = mul nsw i32 4, %12
%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 = %11
%18 = load i32, i32* %3
%19 = add nsw i32 %18, 1
store i32 %19, i32* %3
br label %6
20: ; preds = %6
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [4 x i8] c"%d\0A\00"
@str = [28 x i8] c"enter a upper_limit number:\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
store i32 0, i32* %1
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([28 x i8], [28 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, 2
br i1 %6, label %7, label %8
7: ; preds = %8, %0
ret i32 0
8: ; preds = %0, %8
%9 = phi i32 [ %13, %8 ], [ 1, %0 ]
%10 = shl nsw i32 %9, 2
%11 = mul nsw i32 %10, %9
%12 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i32 %11)
%13 = add nuw nsw i32 %9, 1
%14 = load i32, i32* %1
%15 = sdiv i32 %14, 2
%16 = icmp slt i32 %9, %15
br i1 %16, label %8, label %7
}