int main() {
  int *pc;
  int c;
  c = 22;
  printf("Address of c:%d\n", &c);
  printf("Value of c:%d\n\n", c);
  pc = &c;
  printf("Address of pointer pc:%d\n", pc);
  printf("Content of pointer pc:%d\n\n", *pc);
  c = 11;
  printf("Address of pointer pc:%d\n", pc);
  printf("Content of pointer pc:%d\n\n", *pc);
  *pc = 2;
  printf("Address of c:%d\n", &c);
  printf("Value of c:%d\n\n", c);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x16,-0x14(%rbp)
lea    0xed3(%rip),%rdi
lea    -0x14(%rbp),%rsi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x14(%rbp),%esi
lea    0xecf(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x14(%rbp),%rax
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rsi
lea    0xec5(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x10(%rbp),%rax
mov    (%rax),%esi
lea    0xecb(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0xb,-0x14(%rbp)
mov    -0x10(%rbp),%rsi
lea    0xe98(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x10(%rbp),%rax
mov    (%rax),%esi
lea    0xe9e(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x10(%rbp),%rax
movl   $0x2,(%rax)
lea    0xe4b(%rip),%rdi
lea    -0x14(%rbp),%rsi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x14(%rbp),%esi
lea    0xe47(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x10,%rsp
movl   $0x16,0xc(%rsp)
lea    0xed4(%rip),%r14
lea    0xc(%rsp),%r12
mov    %r14,%rdi
mov    %r12,%rsi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0xc(%rsp),%esi
lea    0xec8(%rip),%r15
mov    %r15,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xec7(%rip),%r13
mov    %r13,%rdi
mov    %r12,%rsi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0xc(%rsp),%esi
lea    0xec9(%rip),%rbx
mov    %rbx,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
movl   $0xb,0xc(%rsp)
mov    %r13,%rdi
mov    %r12,%rsi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0xc(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
movl   $0x2,0xc(%rsp)
mov    %r14,%rdi
mov    %r12,%rsi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0xc(%rsp),%esi
mov    %r15,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [17 x i8] c"Address of c:%d\0A\00"
@.str.1 = [16 x i8] c"Value of c:%d\0A\0A\00"
@.str.2 = [26 x i8] c"Address of pointer pc:%d\0A\00"
@.str.3 = [27 x i8] c"Content of pointer pc:%d\0A\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32*
%3 = alloca i32
store i32 0, i32* %1
store i32 22, i32* %3
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0), i32* %3)
%5 = load i32, i32* %3
%6 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.1, i64 0, i64 0), i32 %5)
store i32* %3, i32** %2
%7 = load i32*, i32** %2
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.2, i64 0, i64 0), i32* %7)
%9 = load i32*, i32** %2
%10 = load i32, i32* %9
%11 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.3, i64 0, i64 0), i32 %10)
store i32 11, i32* %3
%12 = load i32*, i32** %2
%13 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.2, i64 0, i64 0), i32* %12)
%14 = load i32*, i32** %2
%15 = load i32, i32* %14
%16 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.3, i64 0, i64 0), i32 %15)
%17 = load i32*, i32** %2
store i32 2, i32* %17
%18 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0), i32* %3)
%19 = load i32, i32* %3
%20 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.1, i64 0, i64 0), i32 %19)
ret i32 0
}

LLVM IR (-O2):
@.str = [17 x i8] c"Address of c:%d\0A\00"
@.str.1 = [16 x i8] c"Value of c:%d\0A\0A\00"
@.str.2 = [26 x i8] c"Address of pointer pc:%d\0A\00"
@.str.3 = [27 x i8] c"Content of pointer pc:%d\0A\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
store i32 22, i32* %1
%3 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0), i32* %1)
%4 = load i32, i32* %1
%5 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 x i8]* @.str.1, i64 0, i64 0), i32 %4)
%6 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([26 x i8], [26 x i8]* @.str.2, i64 0, i64 0), i32* %1)
%7 = load i32, i32* %1
%8 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([27 x i8], [27 x i8]* @.str.3, i64 0, i64 0), i32 %7)
store i32 11, i32* %1
%9 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([26 x i8], [26 x i8]* @.str.2, i64 0, i64 0), i32* %1)
%10 = load i32, i32* %1
%11 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([27 x i8], [27 x i8]* @.str.3, i64 0, i64 0), i32 %10)
store i32 2, i32* %1
%12 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0), i32* %1)
%13 = load i32, i32* %1
%14 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 x i8]* @.str.1, i64 0, i64 0), i32 %13)
ret i32 0
}