#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 *, ...);
void pointer_to_pointer(void) {
  int n = 12;
  int *pn, **ppn, ***pppn;
  pn = &n;
  ppn = &pn;
  pppn = &ppn;
  printf("%d %d %d\n", *pn, **ppn, ***pppn);
  printf("%p %p %p\n", pn, ppn, pppn);
}


x86 assembly (clang, -O0):
<pointer_to_pointer>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0xc,-0x4(%rbp)
lea    -0x4(%rbp),%rax
mov    %rax,-0x10(%rbp)
lea    -0x10(%rbp),%rax
mov    %rax,-0x18(%rbp)
lea    -0x18(%rbp),%rax
mov    %rax,-0x20(%rbp)
mov    -0x10(%rbp),%rax
mov    (%rax),%esi
mov    -0x18(%rbp),%rax
mov    (%rax),%rax
mov    (%rax),%edx
mov    -0x20(%rbp),%rax
mov    (%rax),%rax
mov    (%rax),%rax
mov    (%rax),%ecx
lea    0xea7(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x10(%rbp),%rsi
mov    -0x18(%rbp),%rdx
mov    -0x20(%rbp),%rcx
lea    0xe97(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<pointer_to_pointer>:
push   %rbx
sub    $0x20,%rsp
movl   $0xc,0xc(%rsp)
lea    0xc(%rsp),%rax
mov    %rax,0x10(%rsp)
lea    0x10(%rsp),%rbx
mov    %rbx,0x18(%rsp)
lea    0xec8(%rip),%rdi
mov    $0xc,%esi
mov    $0xc,%edx
mov    $0xc,%ecx
xor    %eax,%eax
call   1030 <printf@plt>
mov    0x10(%rsp),%rsi
lea    0xeb0(%rip),%rdi
lea    0x18(%rsp),%rcx
mov    %rbx,%rdx
xor    %eax,%eax
call   1030 <printf@plt>
add    $0x20,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [10 x i8] c"%d %d %d\0A\00"
@.str.1 = [10 x i8] c"%p %p %p\0A\00"
define void @pointer_to_pointer() {
%1 = alloca i32
%2 = alloca i32*
%3 = alloca i32**
%4 = alloca i32***
store i32 12, i32* %1
store i32* %1, i32** %2
store i32** %2, i32*** %3
store i32*** %3, i32**** %4
%5 = load i32*, i32** %2
%6 = load i32, i32* %5
%7 = load i32**, i32*** %3
%8 = load i32*, i32** %7
%9 = load i32, i32* %8
%10 = load i32***, i32**** %4
%11 = load i32**, i32*** %10
%12 = load i32*, i32** %11
%13 = load i32, i32* %12
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 %6, i32 %9, i32 %13)
%15 = load i32*, i32** %2
%16 = load i32**, i32*** %3
%17 = load i32***, i32**** %4
%18 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0), i32* %15, i32** %16, i32*** %17)
ret void
}

LLVM IR (-O2):
@.str = [10 x i8] c"%d %d %d\0A\00"
@.str.1 = [10 x i8] c"%p %p %p\0A\00"
define void @pointer_to_pointer() {
%1 = alloca i32
%2 = alloca i32*
%3 = alloca i32**
%4 = bitcast i32* %1 to i8*
store i32 12, i32* %1
%5 = bitcast i32** %2 to i8*
%6 = bitcast i32*** %3 to i8*
store i32* %1, i32** %2
store i32** %2, i32*** %3
%7 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 12, i32 12, i32 12)
%8 = load i32*, i32** %2
%9 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0), i32* %8, i32** %2, i32*** %3)
ret void
}