#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*/ io_out8(int, int);
int /*<<< orphan*/ kprintf(char *);
void init_pic(void) {
  io_out8(0x0021, 0xff);
  io_out8(0x00a1, 0xff);
  io_out8(0x0020, 0x11);
  io_out8(0x0021, 0x20);
  io_out8(0x0021, 1 << 2);
  io_out8(0x0021, 0x01);
  io_out8(0x00a0, 0x11);
  io_out8(0x00a1, 0x28);
  io_out8(0x00a1, 2);
  io_out8(0x00a1, 0x01);
  io_out8(0x0021, 0xfb);
  io_out8(0x00a1, 0xff);
  kprintf("PIC inited\n");
  return;
}


x86 assembly (clang, -O0):
<init_pic>:
push   %rbp
mov    %rsp,%rbp
mov    $0x21,%edi
mov    $0xff,%esi
call   1030 <io_out8@plt>
mov    $0xa1,%edi
mov    $0xff,%esi
call   1030 <io_out8@plt>
mov    $0x20,%edi
mov    $0x11,%esi
call   1030 <io_out8@plt>
mov    $0x21,%edi
mov    $0x20,%esi
call   1030 <io_out8@plt>
mov    $0x21,%edi
mov    $0x4,%esi
call   1030 <io_out8@plt>
mov    $0x21,%edi
mov    $0x1,%esi
call   1030 <io_out8@plt>
mov    $0xa0,%edi
mov    $0x11,%esi
call   1030 <io_out8@plt>
mov    $0xa1,%edi
mov    $0x28,%esi
call   1030 <io_out8@plt>
mov    $0xa1,%edi
mov    $0x2,%esi
call   1030 <io_out8@plt>
mov    $0xa1,%edi
mov    $0x1,%esi
call   1030 <io_out8@plt>
mov    $0x21,%edi
mov    $0xfb,%esi
call   1030 <io_out8@plt>
mov    $0xa1,%edi
mov    $0xff,%esi
call   1030 <io_out8@plt>
lea    0xe21(%rip),%rdi
call   1040 <kprintf@plt>
pop    %rbp
ret

x86 assembly (clang, -O2):
<init_pic>:
push   %rax
mov    $0x21,%edi
mov    $0xff,%esi
call   1030 <io_out8@plt>
mov    $0xa1,%edi
mov    $0xff,%esi
call   1030 <io_out8@plt>
mov    $0x20,%edi
mov    $0x11,%esi
call   1030 <io_out8@plt>
mov    $0x21,%edi
mov    $0x20,%esi
call   1030 <io_out8@plt>
mov    $0x21,%edi
mov    $0x4,%esi
call   1030 <io_out8@plt>
mov    $0x21,%edi
mov    $0x1,%esi
call   1030 <io_out8@plt>
mov    $0xa0,%edi
mov    $0x11,%esi
call   1030 <io_out8@plt>
mov    $0xa1,%edi
mov    $0x28,%esi
call   1030 <io_out8@plt>
mov    $0xa1,%edi
mov    $0x2,%esi
call   1030 <io_out8@plt>
mov    $0xa1,%edi
mov    $0x1,%esi
call   1030 <io_out8@plt>
mov    $0x21,%edi
mov    $0xfb,%esi
call   1030 <io_out8@plt>
mov    $0xa1,%edi
mov    $0xff,%esi
call   1030 <io_out8@plt>
lea    0xe24(%rip),%rdi
pop    %rax
jmp    1040 <kprintf@plt>

LLVM IR (-O0):
@.str = [12 x i8] c"PIC inited\0A\00"
define void @init_pic() {
%1 = call i32 @io_out8(i32 33, i32 255)
%2 = call i32 @io_out8(i32 161, i32 255)
%3 = call i32 @io_out8(i32 32, i32 17)
%4 = call i32 @io_out8(i32 33, i32 32)
%5 = call i32 @io_out8(i32 33, i32 4)
%6 = call i32 @io_out8(i32 33, i32 1)
%7 = call i32 @io_out8(i32 160, i32 17)
%8 = call i32 @io_out8(i32 161, i32 40)
%9 = call i32 @io_out8(i32 161, i32 2)
%10 = call i32 @io_out8(i32 161, i32 1)
%11 = call i32 @io_out8(i32 33, i32 251)
%12 = call i32 @io_out8(i32 161, i32 255)
%13 = call i32 @kprintf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0))
ret void
}

LLVM IR (-O2):
@.str = [12 x i8] c"PIC inited\0A\00"
define void @init_pic() {
%1 = tail call i32 @io_out8(i32 33, i32 255)
%2 = tail call i32 @io_out8(i32 161, i32 255)
%3 = tail call i32 @io_out8(i32 32, i32 17)
%4 = tail call i32 @io_out8(i32 33, i32 32)
%5 = tail call i32 @io_out8(i32 33, i32 4)
%6 = tail call i32 @io_out8(i32 33, i32 1)
%7 = tail call i32 @io_out8(i32 160, i32 17)
%8 = tail call i32 @io_out8(i32 161, i32 40)
%9 = tail call i32 @io_out8(i32 161, i32 2)
%10 = tail call i32 @io_out8(i32 161, i32 1)
%11 = tail call i32 @io_out8(i32 33, i32 251)
%12 = tail call i32 @io_out8(i32 161, i32 255)
%13 = tail call i32 @kprintf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0))
ret void
}