#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 getppid();
int /*<<< orphan*/ printf(char *, int, int, int);
int /*<<< orphan*/ sleep(int);
int main(int argc, char *argv[]) {
  int i;
  for (i = 0; i < 2; ++i) {
    fork();
    printf("ppid=%d, pid=%d, i=%d\n", getppid(), getpid(), i);
  }
  sleep(1);
  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   $0x0,-0x14(%rbp)
cmpl   $0x2,-0x14(%rbp)
jge    11b1 <main+0x61>
mov    $0x0,%al
call   1070 <fork@plt>
mov    $0x0,%al
call   1050 <getppid@plt>
mov    %eax,-0x18(%rbp)
mov    $0x0,%al
call   1030 <getpid@plt>
mov    -0x18(%rbp),%esi
mov    %eax,%edx
mov    -0x14(%rbp),%ecx
lea    0xe62(%rip),%rdi
call   1040 <printf@plt>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    116d <main+0x1d>
mov    $0x1,%edi
call   1060 <sleep@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
xor    %eax,%eax
call   1070 <fork@plt>
xor    %eax,%eax
call   1050 <getppid@plt>
mov    %eax,%ebx
xor    %eax,%eax
call   1030 <getpid@plt>
lea    0xe8e(%rip),%r14
mov    %r14,%rdi
mov    %ebx,%esi
mov    %eax,%edx
xor    %ecx,%ecx
call   1040 <printf@plt>
xor    %eax,%eax
call   1070 <fork@plt>
xor    %eax,%eax
call   1050 <getppid@plt>
mov    %eax,%ebx
xor    %eax,%eax
call   1030 <getpid@plt>
mov    %r14,%rdi
mov    %ebx,%esi
mov    %eax,%edx
mov    $0x1,%ecx
call   1040 <printf@plt>
mov    $0x1,%edi
call   1060 <sleep@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [23 x i8] c"ppid=%d, pid=%d, i=%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 0, i32* %6
br label %7
7: ; preds = %16, %2
%8 = load i32, i32* %6
%9 = icmp slt i32 %8, 2
br i1 %9, label %10, label %19
10: ; preds = %7
%11 = call i32 (...) @fork()
%12 = call i32 (...) @getppid()
%13 = call i32 (...) @getpid()
%14 = load i32, i32* %6
%15 = call i32 @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str, i64 0, i64 0), i32 %12, i32 %13, i32 %14)
br label %16
16: ; preds = %10
%17 = load i32, i32* %6
%18 = add nsw i32 %17, 1
store i32 %18, i32* %6
br label %7
19: ; preds = %7
%20 = call i32 @sleep(i32 1)
ret i32 0
}

LLVM IR (-O2):
@.str = [23 x i8] c"ppid=%d, pid=%d, i=%d\0A\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = tail call i32 (...) @fork()
%4 = tail call i32 (...) @getppid()
%5 = tail call i32 (...) @getpid()
%6 = tail call i32 @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str, i64 0, i64 0), i32 %4, i32 %5, i32 0)
%7 = tail call i32 (...) @fork()
%8 = tail call i32 (...) @getppid()
%9 = tail call i32 (...) @getpid()
%10 = tail call i32 @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str, i64 0, i64 0), i32 %8, i32 %9, i32 1)
%11 = tail call i32 @sleep(i32 1)
ret i32 0
}