#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 n, sum = 0, i;
  printf("Indtast n\n");
  (void)scanf("%d", &n);
  for (i = 1; i <= n; ++i) {
    sum += i;
  }
  if (sum == (n * (n + 1)) / 2) {
    printf("%d er det samme\n", sum);
  } else {
    printf("%d er ikke det samme\n", sum);
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0xc(%rbp)
lea    0xec3(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xec0(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
movl   $0x1,-0x10(%rbp)
mov    -0x10(%rbp),%eax
cmp    -0x8(%rbp),%eax
jg     117e <main+0x5e>
mov    -0x10(%rbp),%eax
add    -0xc(%rbp),%eax
mov    %eax,-0xc(%rbp)
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
jmp    115b <main+0x3b>
mov    -0xc(%rbp),%eax
mov    %eax,-0x14(%rbp)
mov    -0x8(%rbp),%eax
mov    -0x8(%rbp),%ecx
add    $0x1,%ecx
imul   %ecx,%eax
mov    $0x2,%ecx
cltd
idiv   %ecx
mov    %eax,%ecx
mov    -0x14(%rbp),%eax
cmp    %ecx,%eax
jne    11bb <main+0x9b>
mov    -0xc(%rbp),%esi
lea    0xe5f(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    11cc <main+0xac>
mov    -0xc(%rbp),%esi
lea    0xe5a(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xef2(%rip),%rdi
call   1030 <puts@plt>
lea    0xebc(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1050 <scanf@plt>
mov    0x4(%rsp),%eax
test   %eax,%eax
jle    116b <main+0x3b>
lea    -0x1(%rax),%ecx
lea    -0x2(%rax),%edx
imul   %rcx,%rdx
shr    %rdx
lea    (%rdx,%rax,2),%esi
add    $0xffffffff,%esi
jmp    116d <main+0x3d>
xor    %esi,%esi
lea    0x1(%rax),%ecx
imul   %eax,%ecx
mov    %ecx,%eax
shr    $0x1f,%eax
add    %ecx,%eax
sar    %eax
cmp    %eax,%esi
lea    0xe7e(%rip),%rax
lea    0xe88(%rip),%rdi
cmove  %rax,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [11 x i8] c"Indtast n\0A\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [17 x i8] c"%d er det samme\0A\00"
@.str.3 = [22 x i8] c"%d er ikke det samme\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
store i32 0, i32* %1
store i32 0, i32* %3
%5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0))
%6 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
store i32 1, i32* %4
br label %7
7: ; preds = %15, %0
%8 = load i32, i32* %4
%9 = load i32, i32* %2
%10 = icmp sle i32 %8, %9
br i1 %10, label %11, label %18
11: ; preds = %7
%12 = load i32, i32* %4
%13 = load i32, i32* %3
%14 = add nsw i32 %13, %12
store i32 %14, i32* %3
br label %15
15: ; preds = %11
%16 = load i32, i32* %4
%17 = add nsw i32 %16, 1
store i32 %17, i32* %4
br label %7
18: ; preds = %7
%19 = load i32, i32* %3
%20 = load i32, i32* %2
%21 = load i32, i32* %2
%22 = add nsw i32 %21, 1
%23 = mul nsw i32 %20, %22
%24 = sdiv i32 %23, 2
%25 = icmp eq i32 %19, %24
br i1 %25, label %26, label %29
26: ; preds = %18
%27 = load i32, i32* %3
%28 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0), i32 %27)
br label %32
29: ; preds = %18
%30 = load i32, i32* %3
%31 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str.3, i64 0, i64 0), i32 %30)
br label %32
32: ; preds = %29, %26
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [17 x i8] c"%d er det samme\0A\00"
@.str.3 = [22 x i8] c"%d er ikke det samme\0A\00"
@str = [10 x i8] c"Indtast n\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([10 x i8], [10 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, 1
br i1 %6, label %18, label %7
7: ; preds = %0
%8 = shl nuw i32 %5, 1
%9 = add nsw i32 %5, -1
%10 = zext i32 %9 to i33
%11 = add nsw i32 %5, -2
%12 = zext i32 %11 to i33
%13 = mul i33 %10, %12
%14 = lshr i33 %13, 1
%15 = trunc i33 %14 to i32
%16 = add i32 %8, %15
%17 = add i32 %16, -1
br label %18
18: ; preds = %7, %0
%19 = phi i32 [ 0, %0 ], [ %17, %7 ]
%20 = add nsw i32 %5, 1
%21 = mul nsw i32 %20, %5
%22 = sdiv i32 %21, 2
%23 = icmp eq i32 %19, %22
%24 = select i1 %23, i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str.3, i64 0, i64 0)
%25 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) %24, i32 %19)
ret i32 0
}