#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*/ fork();
int /*<<< orphan*/ printf(char *, int);
int main(int argc, char *argv[]) {
  int i;
  for (i = 1; i <= 2; i++) {
    if (!fork())
      printf("%d\n", i);
  }
  printf("%d\n", i);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
movl   $0x1,-0x14(%rbp)
cmpl   $0x2,-0x14(%rbp)
jg     1179 <main+0x59>
mov    $0x0,%al
call   1040 <fork@plt>
cmp    $0x0,%eax
jne    1166 <main+0x46>
mov    -0x14(%rbp),%esi
lea    0xe9f(%rip),%rdi
call   1030 <printf@plt>
jmp    116b <main+0x4b>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    113d <main+0x1d>
mov    -0x14(%rbp),%esi
lea    0xe7d(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
xor    %eax,%eax
call   1040 <fork@plt>
test   %eax,%eax
jne    113d <main+0x1d>
lea    0xecd(%rip),%rdi
mov    $0x1,%esi
call   1030 <printf@plt>
xor    %eax,%eax
call   1040 <fork@plt>
test   %eax,%eax
jne    1159 <main+0x39>
lea    0xeb1(%rip),%rdi
mov    $0x2,%esi
call   1030 <printf@plt>
lea    0xea0(%rip),%rdi
mov    $0x3,%esi
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [4 x i8] c"%d\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
store i32 1, i32* %6
br label %7
7: ; preds = %17, %2
%8 = load i32, i32* %6
%9 = icmp sle i32 %8, 2
br i1 %9, label %10, label %20
10: ; preds = %7
%11 = call i32 (...) @fork()
%12 = icmp ne i32 %11, 0
br i1 %12, label %16, label %13
13: ; preds = %10
%14 = load i32, i32* %6
%15 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %14)
br label %16
16: ; preds = %13, %10
br label %17
17: ; preds = %16
%18 = load i32, i32* %6
%19 = add nsw i32 %18, 1
store i32 %19, i32* %6
br label %7
20: ; preds = %7
%21 = load i32, i32* %6
%22 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %21)
ret i32 0
}

LLVM IR (-O2):
@.str = [4 x i8] c"%d\0A\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = tail call i32 (...) @fork()
%4 = icmp eq i32 %3, 0
br i1 %4, label %5, label %7
5: ; preds = %2
%6 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 1)
br label %7
7: ; preds = %2, %5
%8 = tail call i32 (...) @fork()
%9 = icmp eq i32 %8, 0
br i1 %9, label %10, label %12
10: ; preds = %7
%11 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 2)
br label %12
12: ; preds = %10, %7
%13 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 3)
ret i32 0
}