#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*/ output(int);
main() {
  int i;
  for (i = 0; i < 10; i++) {
    output(i);
  }
  for (i = 10; i > 0; i--) {
    output(i);
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0x8(%rbp)
cmpl   $0xa,-0x8(%rbp)
jge    1146 <main+0x36>
mov    -0x8(%rbp),%edi
call   1030 <output@plt>
mov    -0x8(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
jmp    1126 <main+0x16>
movl   $0xa,-0x8(%rbp)
cmpl   $0x0,-0x8(%rbp)
jle    116d <main+0x5d>
mov    -0x8(%rbp),%edi
call   1030 <output@plt>
mov    -0x8(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,-0x8(%rbp)
jmp    114d <main+0x3d>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
xor    %edi,%edi
call   1030 <output@plt>
mov    $0x1,%edi
call   1030 <output@plt>
mov    $0x2,%edi
call   1030 <output@plt>
mov    $0x3,%edi
call   1030 <output@plt>
mov    $0x4,%edi
call   1030 <output@plt>
mov    $0x5,%edi
call   1030 <output@plt>
mov    $0x6,%edi
call   1030 <output@plt>
mov    $0x7,%edi
call   1030 <output@plt>
mov    $0x8,%edi
call   1030 <output@plt>
mov    $0x9,%edi
call   1030 <output@plt>
mov    $0xa,%edi
call   1030 <output@plt>
mov    $0x9,%edi
call   1030 <output@plt>
mov    $0x8,%edi
call   1030 <output@plt>
mov    $0x7,%edi
call   1030 <output@plt>
mov    $0x6,%edi
call   1030 <output@plt>
mov    $0x5,%edi
call   1030 <output@plt>
mov    $0x4,%edi
call   1030 <output@plt>
mov    $0x3,%edi
call   1030 <output@plt>
mov    $0x2,%edi
call   1030 <output@plt>
mov    $0x1,%edi
call   1030 <output@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, 10
br i1 %5, label %6, label %12
6: ; preds = %3
%7 = load i32, i32* %2
%8 = call i32 @output(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 10, i32* %2
br label %13
13: ; preds = %19, %12
%14 = load i32, i32* %2
%15 = icmp sgt i32 %14, 0
br i1 %15, label %16, label %22
16: ; preds = %13
%17 = load i32, i32* %2
%18 = call i32 @output(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 = load i32, i32* %1
ret i32 %23
}

LLVM IR (-O2):
define i32 @main() {
%1 = tail call i32 @output(i32 0)
%2 = tail call i32 @output(i32 1)
%3 = tail call i32 @output(i32 2)
%4 = tail call i32 @output(i32 3)
%5 = tail call i32 @output(i32 4)
%6 = tail call i32 @output(i32 5)
%7 = tail call i32 @output(i32 6)
%8 = tail call i32 @output(i32 7)
%9 = tail call i32 @output(i32 8)
%10 = tail call i32 @output(i32 9)
%11 = tail call i32 @output(i32 10)
%12 = tail call i32 @output(i32 9)
%13 = tail call i32 @output(i32 8)
%14 = tail call i32 @output(i32 7)
%15 = tail call i32 @output(i32 6)
%16 = tail call i32 @output(i32 5)
%17 = tail call i32 @output(i32 4)
%18 = tail call i32 @output(i32 3)
%19 = tail call i32 @output(i32 2)
%20 = tail call i32 @output(i32 1)
ret i32 0
}