void showPointers() {
  int var = 15;
  int *point;
  point = &var;
  int **pToP;
  pToP = &point;
  printf("The address of var is %x\n", &var);
  printf("The value in point is %x and the value *point would be %d\n", point,
         *point);
  printf("The pointer to pointer value %x\nThe value of first pointer %x\n",
         pToP, *pToP);
  printf("The value of var through pToP is %d\n", **pToP);
}


x86 assembly (clang, -O0):
<showPointers>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0xf,-0x4(%rbp)
lea    -0x4(%rbp),%rax
mov    %rax,-0x10(%rbp)
lea    -0x10(%rbp),%rax
mov    %rax,-0x18(%rbp)
lea    0xeca(%rip),%rdi
lea    -0x4(%rbp),%rsi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x10(%rbp),%rsi
mov    -0x10(%rbp),%rax
mov    (%rax),%edx
lea    0xec8(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x18(%rbp),%rsi
mov    -0x18(%rbp),%rax
mov    (%rax),%rdx
lea    0xeea(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x18(%rbp),%rax
mov    (%rax),%rax
mov    (%rax),%esi
lea    0xf12(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<showPointers>:
push   %rbx
sub    $0x10,%rsp
movl   $0xf,0x4(%rsp)
lea    0x4(%rsp),%rbx
mov    %rbx,0x8(%rsp)
lea    0xed2(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0x4(%rsp),%edx
lea    0xed7(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xf01(%rip),%rdi
lea    0x8(%rsp),%rsi
mov    %rbx,%rdx
xor    %eax,%eax
call   1030 <printf@plt>
mov    0x8(%rsp),%rax
mov    (%rax),%esi
lea    0xf23(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [26 x i8] c"The address of var is %x\0A\00"
@.str.1 = [59 x i8] c"The value in point is %x and the value *point would be %d\0A\00"
@.str.2 = [63 x i8] c"The pointer to pointer value %x\0AThe value of first pointer %x\0A\00"
@.str.3 = [37 x i8] c"The value of var through pToP is %d\0A\00"
define void @showPointers() {
%1 = alloca i32
%2 = alloca i32*
%3 = alloca i32**
store i32 15, i32* %1
store i32* %1, i32** %2
store i32** %2, i32*** %3
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str, i64 0, i64 0), i32* %1)
%5 = load i32*, i32** %2
%6 = load i32*, i32** %2
%7 = load i32, i32* %6
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([59 x i8], [59 x i8]* @.str.1, i64 0, i64 0), i32* %5, i32 %7)
%9 = load i32**, i32*** %3
%10 = load i32**, i32*** %3
%11 = load i32*, i32** %10
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([63 x i8], [63 x i8]* @.str.2, i64 0, i64 0), i32** %9, i32* %11)
%13 = load i32**, i32*** %3
%14 = load i32*, i32** %13
%15 = load i32, i32* %14
%16 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([37 x i8], [37 x i8]* @.str.3, i64 0, i64 0), i32 %15)
ret void
}

LLVM IR (-O2):
@.str = [26 x i8] c"The address of var is %x\0A\00"
@.str.1 = [59 x i8] c"The value in point is %x and the value *point would be %d\0A\00"
@.str.2 = [63 x i8] c"The pointer to pointer value %x\0AThe value of first pointer %x\0A\00"
@.str.3 = [37 x i8] c"The value of var through pToP is %d\0A\00"
define void @showPointers() {
%1 = alloca i32
%2 = alloca i32*
%3 = bitcast i32* %1 to i8*
store i32 15, i32* %1
%4 = bitcast i32** %2 to i8*
store i32* %1, i32** %2
%5 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([26 x i8], [26 x i8]* @.str, i64 0, i64 0), i32* %1)
%6 = load i32, i32* %1
%7 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([59 x i8], [59 x i8]* @.str.1, i64 0, i64 0), i32* %1, i32 %6)
%8 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([63 x i8], [63 x i8]* @.str.2, i64 0, i64 0), i32** %2, i32* %1)
%9 = load i32*, i32** %2
%10 = load i32, i32* %9
%11 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([37 x i8], [37 x i8]* @.str.3, i64 0, i64 0), i32 %10)
ret void
}