#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 getpid();
int /*<<< orphan*/ printf(char *, int);
int main() {
  printf("%d\n", getpid());
  fork();
  printf("%d\n", getpid());
  fork();
  printf("%d\n", getpid());
  fork();
  printf("%d\n", getpid());
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    $0x0,%al
call   1030 <getpid@plt>
mov    %eax,%esi
lea    0xeb1(%rip),%rdi
call   1040 <printf@plt>
mov    $0x0,%al
call   1050 <fork@plt>
mov    $0x0,%al
call   1030 <getpid@plt>
mov    %eax,%esi
lea    0xe95(%rip),%rdi
call   1040 <printf@plt>
mov    $0x0,%al
call   1050 <fork@plt>
mov    $0x0,%al
call   1030 <getpid@plt>
mov    %eax,%esi
lea    0xe79(%rip),%rdi
call   1040 <printf@plt>
mov    $0x0,%al
call   1050 <fork@plt>
mov    $0x0,%al
call   1030 <getpid@plt>
mov    %eax,%esi
lea    0xe5d(%rip),%rdi
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
xor    %eax,%eax
call   1030 <getpid@plt>
lea    0xec1(%rip),%rbx
mov    %rbx,%rdi
mov    %eax,%esi
call   1040 <printf@plt>
xor    %eax,%eax
call   1050 <fork@plt>
xor    %eax,%eax
call   1030 <getpid@plt>
mov    %rbx,%rdi
mov    %eax,%esi
call   1040 <printf@plt>
xor    %eax,%eax
call   1050 <fork@plt>
xor    %eax,%eax
call   1030 <getpid@plt>
mov    %rbx,%rdi
mov    %eax,%esi
call   1040 <printf@plt>
xor    %eax,%eax
call   1050 <fork@plt>
xor    %eax,%eax
call   1030 <getpid@plt>
mov    %rbx,%rdi
mov    %eax,%esi
call   1040 <printf@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [4 x i8] c"%d\0A\00"
define i32 @main() {
%1 = alloca i32
store i32 0, i32* %1
%2 = call i32 (...) @getpid()
%3 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %2)
%4 = call i32 (...) @fork()
%5 = call i32 (...) @getpid()
%6 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %5)
%7 = call i32 (...) @fork()
%8 = call i32 (...) @getpid()
%9 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %8)
%10 = call i32 (...) @fork()
%11 = call i32 (...) @getpid()
%12 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %11)
ret i32 0
}

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