#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() {
  int iter, i, j;
  printf("Cuantos niveles?\n");
  scanf("%d", &iter);
  for (i = iter; i > 0; i--) {
    for (j = i; j > 0; j--) {
      printf("*");
    }
    printf("\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    0xed0(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0x8(%rbp),%eax
mov    %eax,-0xc(%rbp)
cmpl   $0x0,-0xc(%rbp)
jle    119f <main+0x7f>
mov    -0xc(%rbp),%eax
mov    %eax,-0x10(%rbp)
cmpl   $0x0,-0x10(%rbp)
jle    1185 <main+0x65>
lea    0xea3(%rip),%rdi
call   1030 <printf@plt>
mov    -0x10(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,-0x10(%rbp)
jmp    1161 <main+0x41>
lea    0xe84(%rip),%rdi
call   1030 <printf@plt>
mov    -0xc(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,-0xc(%rbp)
jmp    1151 <main+0x31>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r14
push   %rbx
sub    $0x10,%rsp
lea    0xec4(%rip),%rdi
call   1040 <puts@plt>
lea    0xeb5(%rip),%rdi
lea    0xc(%rsp),%rsi
call   1050 <scanf@plt>
mov    0xc(%rsp),%r14d
test   %r14d,%r14d
jle    11ac <main+0x7c>
lea    0x1(%r14),%ebx
cs nopw 0x0(%rax,%rax,1)
nopl   (%rax)
mov    %ebx,%ebp
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax)
mov    $0x2a,%edi
call   1030 <putchar@plt>
add    $0xffffffff,%ebp
cmp    $0x1,%ebp
ja     1180 <main+0x50>
mov    $0xa,%edi
call   1030 <putchar@plt>
lea    -0x1(%r14),%eax
add    $0xffffffff,%ebx
cmp    $0x1,%r14d
mov    %eax,%r14d
jg     1170 <main+0x40>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r14
pop    %rbp
ret

LLVM IR (-O0):
@.str = [18 x i8] c"Cuantos niveles?\0A\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [2 x i8] c"*\00"
@.str.3 = [2 x i8] c"\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
store i32 0, i32* %1
%5 = call i32 @printf(i8* getelementptr inbounds ([18 x i8], [18 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)
%7 = load i32, i32* %2
store i32 %7, i32* %3
br label %8
8: ; preds = %23, %0
%9 = load i32, i32* %3
%10 = icmp sgt i32 %9, 0
br i1 %10, label %11, label %26
11: ; preds = %8
%12 = load i32, i32* %3
store i32 %12, i32* %4
br label %13
13: ; preds = %18, %11
%14 = load i32, i32* %4
%15 = icmp sgt i32 %14, 0
br i1 %15, label %16, label %21
16: ; preds = %13
%17 = call i32 @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
br label %18
18: ; preds = %16
%19 = load i32, i32* %4
%20 = add nsw i32 %19, -1
store i32 %20, i32* %4
br label %13
21: ; preds = %13
%22 = call i32 @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
br label %23
23: ; preds = %21
%24 = load i32, i32* %3
%25 = add nsw i32 %24, -1
store i32 %25, i32* %3
br label %8
26: ; preds = %8
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [3 x i8] c"%d\00"
@str = [17 x i8] c"Cuantos niveles?\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 @puts(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 sgt i32 %5, 0
br i1 %6, label %7, label %18
7: ; preds = %0, %14
%8 = phi i32 [ %16, %14 ], [ %5, %0 ]
br label %9
9: ; preds = %7, %9
%10 = phi i32 [ %12, %9 ], [ %8, %7 ]
%11 = call i32 @putchar(i32 42)
%12 = add nsw i32 %10, -1
%13 = icmp ugt i32 %10, 1
br i1 %13, label %9, label %14
14: ; preds = %9
%15 = call i32 @putchar(i32 10)
%16 = add nsw i32 %8, -1
%17 = icmp sgt i32 %8, 1
br i1 %17, label %7, label %18
18: ; preds = %14, %0
ret i32 0
}