#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 *);
main() {
  int s;
  int c;
  int n;
  printf("Inserisci quanti n numeri sono necessari per la somma ");
  scanf("%d", &n);
  s = 0;
  c = 0;
  while (c < n) {
    c = c + 1;
    s = s + c;
  }
  printf("La somma dei primi n numeri e' %d", s);
}


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    0xf12(%rip),%rdi
lea    -0x10(%rbp),%rsi
call   1040 <scanf@plt>
movl   $0x0,-0x8(%rbp)
movl   $0x0,-0xc(%rbp)
mov    -0xc(%rbp),%eax
cmp    -0x10(%rbp),%eax
jge    117e <main+0x5e>
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
mov    -0x8(%rbp),%eax
add    -0xc(%rbp),%eax
mov    %eax,-0x8(%rbp)
jmp    115b <main+0x3b>
mov    -0x8(%rbp),%esi
lea    0xeaf(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x10,%rsp
lea    0xed4(%rip),%rdi
xor    %ebx,%ebx
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xf1a(%rip),%rdi
lea    0xc(%rsp),%rsi
call   1040 <scanf@plt>
mov    0xc(%rsp),%eax
test   %eax,%eax
jle    1161 <main+0x41>
lea    -0x1(%rax),%ecx
lea    -0x2(%rax),%edx
imul   %rcx,%rdx
shr    %rdx
lea    (%rdx,%rax,2),%ebx
add    $0xffffffff,%ebx
lea    0xecf(%rip),%rdi
mov    %ebx,%esi
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [55 x i8] c"Inserisci quanti n numeri sono necessari per la somma \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [34 x i8] c"La somma dei primi n numeri e' %d\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
store i32 0, i32* %1
%5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([55 x i8], [55 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* %4)
store i32 0, i32* %2
store i32 0, i32* %3
br label %7
7: ; preds = %11, %0
%8 = load i32, i32* %3
%9 = load i32, i32* %4
%10 = icmp slt i32 %8, %9
br i1 %10, label %11, label %17
11: ; preds = %7
%12 = load i32, i32* %3
%13 = add nsw i32 %12, 1
store i32 %13, i32* %3
%14 = load i32, i32* %2
%15 = load i32, i32* %3
%16 = add nsw i32 %14, %15
store i32 %16, i32* %2
br label %7
17: ; preds = %7
%18 = load i32, i32* %2
%19 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([34 x i8], [34 x i8]* @.str.2, i64 0, i64 0), i32 %18)
%20 = load i32, i32* %1
ret i32 %20
}

LLVM IR (-O2):
@.str = [55 x i8] c"Inserisci quanti n numeri sono necessari per la somma \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [34 x i8] c"La somma dei primi n numeri e' %d\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([55 x i8], [55 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 sgt i32 %5, 0
br i1 %6, label %7, label %18
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 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([34 x i8], [34 x i8]* @.str.2, i64 0, i64 0), i32 %19)
ret i32 0
}