#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*/ clear();
int /*<<< orphan*/ delete (int);
int /*<<< orphan*/ push_back(int);
int /*<<< orphan*/ push_front(int);
int /*<<< orphan*/ traverse();
int /*<<< orphan*/ update(int /*<<< orphan*/, char);
int main() {
  int i;
  for (i = 0; i < 20; i++) {
    push_back(i);
  }
  for (i = -1; i > -20; i--) {
    push_front(i);
  }
  delete (10);
  delete (-10);
  update(0, 'a');
  traverse();
  clear();
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0x8(%rbp)
cmpl   $0x14,-0x8(%rbp)
jge    1196 <main+0x36>
mov    -0x8(%rbp),%edi
call   1060 <push_back@plt>
mov    -0x8(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
jmp    1176 <main+0x16>
movl   $0xffffffff,-0x8(%rbp)
cmpl   $0xffffffec,-0x8(%rbp)
jle    11bd <main+0x5d>
mov    -0x8(%rbp),%edi
call   1050 <push_front@plt>
mov    -0x8(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,-0x8(%rbp)
jmp    119d <main+0x3d>
mov    $0xa,%edi
call   1070 <delete@plt>
mov    $0xfffffff6,%edi
call   1070 <delete@plt>
xor    %edi,%edi
mov    $0x61,%esi
call   1030 <update@plt>
mov    $0x0,%al
call   1040 <traverse@plt>
mov    $0x0,%al
call   1080 <clear@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
xor    %edi,%edi
call   1060 <push_back@plt>
mov    $0x1,%edi
call   1060 <push_back@plt>
mov    $0x2,%edi
call   1060 <push_back@plt>
mov    $0x3,%edi
call   1060 <push_back@plt>
mov    $0x4,%edi
call   1060 <push_back@plt>
mov    $0x5,%edi
call   1060 <push_back@plt>
mov    $0x6,%edi
call   1060 <push_back@plt>
mov    $0x7,%edi
call   1060 <push_back@plt>
mov    $0x8,%edi
call   1060 <push_back@plt>
mov    $0x9,%edi
call   1060 <push_back@plt>
mov    $0xa,%edi
call   1060 <push_back@plt>
mov    $0xb,%edi
call   1060 <push_back@plt>
mov    $0xc,%edi
call   1060 <push_back@plt>
mov    $0xd,%edi
call   1060 <push_back@plt>
mov    $0xe,%edi
call   1060 <push_back@plt>
mov    $0xf,%edi
call   1060 <push_back@plt>
mov    $0x10,%edi
call   1060 <push_back@plt>
mov    $0x11,%edi
call   1060 <push_back@plt>
mov    $0x12,%edi
call   1060 <push_back@plt>
mov    $0x13,%edi
call   1060 <push_back@plt>
mov    $0xffffffff,%edi
call   1050 <push_front@plt>
mov    $0xfffffffe,%edi
call   1050 <push_front@plt>
mov    $0xfffffffd,%edi
call   1050 <push_front@plt>
mov    $0xfffffffc,%edi
call   1050 <push_front@plt>
mov    $0xfffffffb,%edi
call   1050 <push_front@plt>
mov    $0xfffffffa,%edi
call   1050 <push_front@plt>
mov    $0xfffffff9,%edi
call   1050 <push_front@plt>
mov    $0xfffffff8,%edi
call   1050 <push_front@plt>
mov    $0xfffffff7,%edi
call   1050 <push_front@plt>
mov    $0xfffffff6,%edi
call   1050 <push_front@plt>
mov    $0xfffffff5,%edi
call   1050 <push_front@plt>
mov    $0xfffffff4,%edi
call   1050 <push_front@plt>
mov    $0xfffffff3,%edi
call   1050 <push_front@plt>
mov    $0xfffffff2,%edi
call   1050 <push_front@plt>
mov    $0xfffffff1,%edi
call   1050 <push_front@plt>
mov    $0xfffffff0,%edi
call   1050 <push_front@plt>
mov    $0xffffffef,%edi
call   1050 <push_front@plt>
mov    $0xffffffee,%edi
call   1050 <push_front@plt>
mov    $0xffffffed,%edi
call   1050 <push_front@plt>
mov    $0xa,%edi
call   1070 <delete@plt>
mov    $0xfffffff6,%edi
call   1070 <delete@plt>
xor    %edi,%edi
mov    $0x61,%esi
call   1030 <update@plt>
xor    %eax,%eax
call   1040 <traverse@plt>
xor    %eax,%eax
call   1080 <clear@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
store i32 0, i32* %1
store i32 0, i32* %2
br label %3
3: ; preds = %9, %0
%4 = load i32, i32* %2
%5 = icmp slt i32 %4, 20
br i1 %5, label %6, label %12
6: ; preds = %3
%7 = load i32, i32* %2
%8 = call i32 @push_back(i32 %7)
br label %9
9: ; preds = %6
%10 = load i32, i32* %2
%11 = add nsw i32 %10, 1
store i32 %11, i32* %2
br label %3
12: ; preds = %3
store i32 -1, i32* %2
br label %13
13: ; preds = %19, %12
%14 = load i32, i32* %2
%15 = icmp sgt i32 %14, -20
br i1 %15, label %16, label %22
16: ; preds = %13
%17 = load i32, i32* %2
%18 = call i32 @push_front(i32 %17)
br label %19
19: ; preds = %16
%20 = load i32, i32* %2
%21 = add nsw i32 %20, -1
store i32 %21, i32* %2
br label %13
22: ; preds = %13
%23 = call i32 @delete(i32 10)
%24 = call i32 @delete(i32 -10)
%25 = call i32 @update(i32 0, i8 signext 97)
%26 = call i32 (...) @traverse()
%27 = call i32 (...) @clear()
ret i32 0
}

LLVM IR (-O2):
define i32 @main() {
%1 = tail call i32 @push_back(i32 0)
%2 = tail call i32 @push_back(i32 1)
%3 = tail call i32 @push_back(i32 2)
%4 = tail call i32 @push_back(i32 3)
%5 = tail call i32 @push_back(i32 4)
%6 = tail call i32 @push_back(i32 5)
%7 = tail call i32 @push_back(i32 6)
%8 = tail call i32 @push_back(i32 7)
%9 = tail call i32 @push_back(i32 8)
%10 = tail call i32 @push_back(i32 9)
%11 = tail call i32 @push_back(i32 10)
%12 = tail call i32 @push_back(i32 11)
%13 = tail call i32 @push_back(i32 12)
%14 = tail call i32 @push_back(i32 13)
%15 = tail call i32 @push_back(i32 14)
%16 = tail call i32 @push_back(i32 15)
%17 = tail call i32 @push_back(i32 16)
%18 = tail call i32 @push_back(i32 17)
%19 = tail call i32 @push_back(i32 18)
%20 = tail call i32 @push_back(i32 19)
%21 = tail call i32 @push_front(i32 -1)
%22 = tail call i32 @push_front(i32 -2)
%23 = tail call i32 @push_front(i32 -3)
%24 = tail call i32 @push_front(i32 -4)
%25 = tail call i32 @push_front(i32 -5)
%26 = tail call i32 @push_front(i32 -6)
%27 = tail call i32 @push_front(i32 -7)
%28 = tail call i32 @push_front(i32 -8)
%29 = tail call i32 @push_front(i32 -9)
%30 = tail call i32 @push_front(i32 -10)
%31 = tail call i32 @push_front(i32 -11)
%32 = tail call i32 @push_front(i32 -12)
%33 = tail call i32 @push_front(i32 -13)
%34 = tail call i32 @push_front(i32 -14)
%35 = tail call i32 @push_front(i32 -15)
%36 = tail call i32 @push_front(i32 -16)
%37 = tail call i32 @push_front(i32 -17)
%38 = tail call i32 @push_front(i32 -18)
%39 = tail call i32 @push_front(i32 -19)
%40 = tail call i32 @delete(i32 10)
%41 = tail call i32 @delete(i32 -10)
%42 = tail call i32 @update(i32 0, i8 signext 97)
%43 = tail call i32 (...) @traverse()
%44 = tail call i32 (...) @clear()
ret i32 0
}