int main(void) {
  int n = 7;
  int *np = &n;
  int **npp = &np;
  printf("n = %d\n", n);
  printf("np = 0x%x, deferenced = %d\n", np, *np);
  printf("npp = 0x%x, dereferenced = 0x%x, dereferenced twice = %d\n", npp,
         *npp, **npp);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x7,-0x8(%rbp)
lea    -0x8(%rbp),%rax
mov    %rax,-0x10(%rbp)
lea    -0x10(%rbp),%rax
mov    %rax,-0x18(%rbp)
mov    -0x8(%rbp),%esi
lea    0xec0(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x10(%rbp),%rsi
mov    -0x10(%rbp),%rax
mov    (%rax),%edx
lea    0xeb0(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x18(%rbp),%rsi
mov    -0x18(%rbp),%rax
mov    (%rax),%rdx
mov    -0x18(%rbp),%rax
mov    (%rax),%rax
mov    (%rax),%ecx
lea    0xeaa(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x10,%rsp
movl   $0x7,0x4(%rsp)
lea    0x4(%rsp),%rbx
mov    %rbx,0x8(%rsp)
lea    0xed2(%rip),%rdi
mov    $0x7,%esi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0x4(%rsp),%edx
lea    0xec3(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0x4(%rsp),%ecx
lea    0xeca(%rip),%rdi
lea    0x8(%rsp),%rsi
mov    %rbx,%rdx
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [8 x i8] c"n = %d\0A\00"
@.str.1 = [28 x i8] c"np = 0x%x, deferenced = %d\0A\00"
@.str.2 = [58 x i8] c"npp = 0x%x, dereferenced = 0x%x, dereferenced twice = %d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32*
%4 = alloca i32**
store i32 0, i32* %1
store i32 7, i32* %2
store i32* %2, i32** %3
store i32** %3, i32*** %4
%5 = load i32, i32* %2
%6 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), i32 %5)
%7 = load i32*, i32** %3
%8 = load i32*, i32** %3
%9 = load i32, i32* %8
%10 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.1, i64 0, i64 0), i32* %7, i32 %9)
%11 = load i32**, i32*** %4
%12 = load i32**, i32*** %4
%13 = load i32*, i32** %12
%14 = load i32**, i32*** %4
%15 = load i32*, i32** %14
%16 = load i32, i32* %15
%17 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([58 x i8], [58 x i8]* @.str.2, i64 0, i64 0), i32** %11, i32* %13, i32 %16)
ret i32 0
}

LLVM IR (-O2):
@.str = [8 x i8] c"n = %d\0A\00"
@.str.1 = [28 x i8] c"np = 0x%x, deferenced = %d\0A\00"
@.str.2 = [58 x i8] c"npp = 0x%x, dereferenced = 0x%x, dereferenced twice = %d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32*
%3 = bitcast i32* %1 to i8*
store i32 7, i32* %1
%4 = bitcast i32** %2 to i8*
store i32* %1, i32** %2
%5 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), i32 7)
%6 = load i32, i32* %1
%7 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([28 x i8], [28 x i8]* @.str.1, i64 0, i64 0), i32* %1, i32 %6)
%8 = load i32, i32* %1
%9 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([58 x i8], [58 x i8]* @.str.2, i64 0, i64 0), i32** %2, i32* %1, i32 %8)
ret i32 0
}