#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_wait();
unsigned char port_byte_in(int);
int /*<<< orphan*/ port_byte_out(int, int);
void pic_remap(void) {
  unsigned char master_masks, slave_masks;
  master_masks = port_byte_in((0x20 + 1));
  slave_masks = port_byte_in((0xA0 + 1));
  port_byte_out(0x20, 0x10 + 0x01);
  io_wait();
  port_byte_out(0xA0, 0x10 + 0x01);
  io_wait();
  port_byte_out((0x20 + 1), 0x20);
  io_wait();
  port_byte_out((0xA0 + 1), 0x28);
  io_wait();
  port_byte_out((0x20 + 1), 0x04);
  io_wait();
  port_byte_out((0xA0 + 1), 0x02);
  io_wait();
  port_byte_out((0x20 + 1), 0x01);
  io_wait();
  port_byte_out((0xA0 + 1), 0x01);
  io_wait();
  port_byte_out((0x20 + 1), 0);
  port_byte_out((0xA0 + 1), 0);
}


x86 assembly (clang, -O0):
<pic_remap>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    $0x21,%edi
call   1050 <port_byte_in@plt>
mov    %al,-0x1(%rbp)
mov    $0xa1,%edi
call   1050 <port_byte_in@plt>
mov    %al,-0x2(%rbp)
mov    $0x20,%edi
mov    $0x11,%esi
call   1030 <port_byte_out@plt>
mov    $0x0,%al
call   1040 <io_wait@plt>
mov    $0xa0,%edi
mov    $0x11,%esi
call   1030 <port_byte_out@plt>
mov    $0x0,%al
call   1040 <io_wait@plt>
mov    $0x21,%edi
mov    $0x20,%esi
call   1030 <port_byte_out@plt>
mov    $0x0,%al
call   1040 <io_wait@plt>
mov    $0xa1,%edi
mov    $0x28,%esi
call   1030 <port_byte_out@plt>
mov    $0x0,%al
call   1040 <io_wait@plt>
mov    $0x21,%edi
mov    $0x4,%esi
call   1030 <port_byte_out@plt>
mov    $0x0,%al
call   1040 <io_wait@plt>
mov    $0xa1,%edi
mov    $0x2,%esi
call   1030 <port_byte_out@plt>
mov    $0x0,%al
call   1040 <io_wait@plt>
mov    $0x21,%edi
mov    $0x1,%esi
call   1030 <port_byte_out@plt>
mov    $0x0,%al
call   1040 <io_wait@plt>
mov    $0xa1,%edi
mov    $0x1,%esi
call   1030 <port_byte_out@plt>
mov    $0x0,%al
call   1040 <io_wait@plt>
mov    $0x21,%edi
xor    %esi,%esi
call   1030 <port_byte_out@plt>
mov    $0xa1,%edi
xor    %esi,%esi
call   1030 <port_byte_out@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<pic_remap>:
push   %rax
mov    $0x21,%edi
call   1050 <port_byte_in@plt>
mov    $0xa1,%edi
call   1050 <port_byte_in@plt>
mov    $0x20,%edi
mov    $0x11,%esi
call   1030 <port_byte_out@plt>
xor    %eax,%eax
call   1040 <io_wait@plt>
mov    $0xa0,%edi
mov    $0x11,%esi
call   1030 <port_byte_out@plt>
xor    %eax,%eax
call   1040 <io_wait@plt>
mov    $0x21,%edi
mov    $0x20,%esi
call   1030 <port_byte_out@plt>
xor    %eax,%eax
call   1040 <io_wait@plt>
mov    $0xa1,%edi
mov    $0x28,%esi
call   1030 <port_byte_out@plt>
xor    %eax,%eax
call   1040 <io_wait@plt>
mov    $0x21,%edi
mov    $0x4,%esi
call   1030 <port_byte_out@plt>
xor    %eax,%eax
call   1040 <io_wait@plt>
mov    $0xa1,%edi
mov    $0x2,%esi
call   1030 <port_byte_out@plt>
xor    %eax,%eax
call   1040 <io_wait@plt>
mov    $0x21,%edi
mov    $0x1,%esi
call   1030 <port_byte_out@plt>
xor    %eax,%eax
call   1040 <io_wait@plt>
mov    $0xa1,%edi
mov    $0x1,%esi
call   1030 <port_byte_out@plt>
xor    %eax,%eax
call   1040 <io_wait@plt>
mov    $0x21,%edi
xor    %esi,%esi
call   1030 <port_byte_out@plt>
mov    $0xa1,%edi
xor    %esi,%esi
pop    %rax
jmp    1030 <port_byte_out@plt>

LLVM IR (-O0):
define void @pic_remap() {
%1 = alloca i8
%2 = alloca i8
%3 = call zeroext i8 @port_byte_in(i32 33)
store i8 %3, i8* %1
%4 = call zeroext i8 @port_byte_in(i32 161)
store i8 %4, i8* %2
%5 = call i32 @port_byte_out(i32 32, i32 17)
%6 = call i32 (...) @io_wait()
%7 = call i32 @port_byte_out(i32 160, i32 17)
%8 = call i32 (...) @io_wait()
%9 = call i32 @port_byte_out(i32 33, i32 32)
%10 = call i32 (...) @io_wait()
%11 = call i32 @port_byte_out(i32 161, i32 40)
%12 = call i32 (...) @io_wait()
%13 = call i32 @port_byte_out(i32 33, i32 4)
%14 = call i32 (...) @io_wait()
%15 = call i32 @port_byte_out(i32 161, i32 2)
%16 = call i32 (...) @io_wait()
%17 = call i32 @port_byte_out(i32 33, i32 1)
%18 = call i32 (...) @io_wait()
%19 = call i32 @port_byte_out(i32 161, i32 1)
%20 = call i32 (...) @io_wait()
%21 = call i32 @port_byte_out(i32 33, i32 0)
%22 = call i32 @port_byte_out(i32 161, i32 0)
ret void
}

LLVM IR (-O2):
define void @pic_remap() {
%1 = tail call zeroext i8 @port_byte_in(i32 33)
%2 = tail call zeroext i8 @port_byte_in(i32 161)
%3 = tail call i32 @port_byte_out(i32 32, i32 17)
%4 = tail call i32 (...) @io_wait()
%5 = tail call i32 @port_byte_out(i32 160, i32 17)
%6 = tail call i32 (...) @io_wait()
%7 = tail call i32 @port_byte_out(i32 33, i32 32)
%8 = tail call i32 (...) @io_wait()
%9 = tail call i32 @port_byte_out(i32 161, i32 40)
%10 = tail call i32 (...) @io_wait()
%11 = tail call i32 @port_byte_out(i32 33, i32 4)
%12 = tail call i32 (...) @io_wait()
%13 = tail call i32 @port_byte_out(i32 161, i32 2)
%14 = tail call i32 (...) @io_wait()
%15 = tail call i32 @port_byte_out(i32 33, i32 1)
%16 = tail call i32 (...) @io_wait()
%17 = tail call i32 @port_byte_out(i32 161, i32 1)
%18 = tail call i32 (...) @io_wait()
%19 = tail call i32 @port_byte_out(i32 33, i32 0)
%20 = tail call i32 @port_byte_out(i32 161, i32 0)
ret void
}