#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 */
typedef int pid_t;

/* Variables and functions */
int fork();
int getpid();
int /*<<< orphan*/ printf(char *, ...);
int main(void) {
  pid_t pid;
  printf("In parent process\n");
  printf("PID before fork() --> %d\n", getpid());
  pid = fork();
  printf("Value returned by fork() --> %d\n", pid);
  printf("PID after fork() --> %d\n", getpid());
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeba(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    $0x0,%al
call   1030 <getpid@plt>
mov    %eax,%esi
lea    0xeb6(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    $0x0,%al
call   1050 <fork@plt>
mov    %eax,-0x8(%rbp)
mov    -0x8(%rbp),%esi
lea    0xeb5(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    $0x0,%al
call   1030 <getpid@plt>
mov    %eax,%esi
lea    0xebf(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xf0c(%rip),%rdi
call   1030 <puts@plt>
xor    %eax,%eax
call   1040 <getpid@plt>
lea    0xea5(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1050 <printf@plt>
xor    %eax,%eax
call   1060 <fork@plt>
lea    0xea8(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1050 <printf@plt>
xor    %eax,%eax
call   1040 <getpid@plt>
lea    0xeb2(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1050 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [19 x i8] c"In parent process\0A\00"
@.str.1 = [26 x i8] c"PID before fork() --> %d\0A\00"
@.str.2 = [33 x i8] c"Value returned by fork() --> %d\0A\00"
@.str.3 = [25 x i8] c"PID after fork() --> %d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
store i32 0, i32* %1
%3 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str, i64 0, i64 0))
%4 = call i32 (...) @getpid()
%5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.1, i64 0, i64 0), i32 %4)
%6 = call i32 (...) @fork()
store i32 %6, i32* %2
%7 = load i32, i32* %2
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @.str.2, i64 0, i64 0), i32 %7)
%9 = call i32 (...) @getpid()
%10 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.3, i64 0, i64 0), i32 %9)
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [26 x i8] c"PID before fork() --> %d\0A\00"
@.str.2 = [33 x i8] c"Value returned by fork() --> %d\0A\00"
@.str.3 = [25 x i8] c"PID after fork() --> %d\0A\00"
@str = [18 x i8] c"In parent process\00"
define i32 @main() {
%1 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([18 x i8], [18 x i8]* @str, i64 0, i64 0))
%2 = tail call i32 (...) @getpid()
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([26 x i8], [26 x i8]* @.str.1, i64 0, i64 0), i32 %2)
%4 = tail call i32 (...) @fork()
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([33 x i8], [33 x i8]* @.str.2, i64 0, i64 0), i32 %4)
%6 = tail call i32 (...) @getpid()
%7 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @.str.3, i64 0, i64 0), i32 %6)
ret i32 0
}