#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 main(int argc, char **argv) {
  printf("Hi!\n");
  printf("I'm a pretty useless program, actually I'm just trying to access a "
         "null pointer...\n\n");
  printf("Sincerely,\n");
  printf("A null pointer exception\n");
  volatile char *xx = 0;
  xx[0] = '\0';
  printf("PS: I's NOT working! q.e.d.\n");
  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)
lea    0xed3(%rip),%rdi
call   1030 <printf@plt>
lea    0xecc(%rip),%rdi
call   1030 <printf@plt>
lea    0xf15(%rip),%rdi
call   1030 <printf@plt>
lea    0xf15(%rip),%rdi
call   1030 <printf@plt>
movq   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%rax
movb   $0x0,(%rax)
lea    0xf14(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xee8(%rip),%rdi
call   1030 <puts@plt>
lea    0xee0(%rip),%rdi
call   1030 <puts@plt>
lea    0xf28(%rip),%rdi
call   1030 <puts@plt>
lea    0xf27(%rip),%rdi
call   1030 <puts@plt>
movb   $0x0,0x0
lea    0xf2c(%rip),%rdi
call   1030 <puts@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [5 x i8] c"Hi!\0A\00"
@.str.1 = [85 x i8] c"I'm a pretty useless program, actually I'm just trying to access a null pointer...\0A\0A\00"
@.str.2 = [12 x i8] c"Sincerely,\0A\00"
@.str.3 = [26 x i8] c"A null pointer exception\0A\00"
@.str.4 = [29 x i8] c"PS: I's NOT working! q.e.d.\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i8*
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%7 = call i32 @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0))
%8 = call i32 @printf(i8* getelementptr inbounds ([85 x i8], [85 x i8]* @.str.1, i64 0, i64 0))
%9 = call i32 @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.2, i64 0, i64 0))
%10 = call i32 @printf(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.3, i64 0, i64 0))
store i8* null, i8** %6
%11 = load i8*, i8** %6
%12 = getelementptr inbounds i8, i8* %11, i64 0
store volatile i8 0, i8* %12
%13 = call i32 @printf(i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str.4, i64 0, i64 0))
ret i32 0
}

LLVM IR (-O2):
@str = [4 x i8] c"Hi!\00"
@str.5 = [84 x i8] c"I'm a pretty useless program, actually I'm just trying to access a null pointer...\0A\00"
@str.6 = [11 x i8] c"Sincerely,\00"
@str.7 = [25 x i8] c"A null pointer exception\00"
@str.8 = [28 x i8] c"PS: I's NOT working! q.e.d.\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @str, i64 0, i64 0))
%4 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([84 x i8], [84 x i8]* @str.5, i64 0, i64 0))
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([11 x i8], [11 x i8]* @str.6, i64 0, i64 0))
%6 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @str.7, i64 0, i64 0))
store volatile i8 0, i8* null
%7 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([28 x i8], [28 x i8]* @str.8, i64 0, i64 0))
ret i32 0
}