#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*/ assert(int);
int factorial(int);
int main() {
  assert(2 == factorial(2));
  assert(6 == factorial(3));
  assert(120 == factorial(5));
  assert(3628800 == factorial(10));
  assert(1307674368000 == factorial(15));
  assert(2432902008176640000 == factorial(20));
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    $0x2,%edi
call   1030 <factorial@plt>
mov    %eax,%ecx
mov    $0x2,%eax
cmp    %ecx,%eax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1040 <assert@plt>
mov    $0x3,%edi
call   1030 <factorial@plt>
mov    %eax,%ecx
mov    $0x6,%eax
cmp    %ecx,%eax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1040 <assert@plt>
mov    $0x5,%edi
call   1030 <factorial@plt>
mov    %eax,%ecx
mov    $0x78,%eax
cmp    %ecx,%eax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1040 <assert@plt>
mov    $0xa,%edi
call   1030 <factorial@plt>
mov    %eax,%ecx
mov    $0x375f00,%eax
cmp    %ecx,%eax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1040 <assert@plt>
mov    $0xf,%edi
call   1030 <factorial@plt>
movslq %eax,%rcx
movabs $0x13077775800,%rax
cmp    %rcx,%rax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1040 <assert@plt>
mov    $0x14,%edi
call   1030 <factorial@plt>
movslq %eax,%rcx
movabs $0x21c3677c82b40000,%rax
67 c3 21
cmp    %rcx,%rax
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1040 <assert@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
mov    $0x2,%edi
call   1030 <factorial@plt>
xor    %edi,%edi
cmp    $0x2,%eax
sete   %dil
call   1040 <assert@plt>
mov    $0x3,%edi
call   1030 <factorial@plt>
xor    %edi,%edi
cmp    $0x6,%eax
sete   %dil
call   1040 <assert@plt>
mov    $0x5,%edi
call   1030 <factorial@plt>
xor    %edi,%edi
cmp    $0x78,%eax
sete   %dil
call   1040 <assert@plt>
mov    $0xa,%edi
call   1030 <factorial@plt>
xor    %edi,%edi
cmp    $0x375f00,%eax
sete   %dil
call   1040 <assert@plt>
mov    $0xf,%edi
call   1030 <factorial@plt>
xor    %edi,%edi
call   1040 <assert@plt>
mov    $0x14,%edi
call   1030 <factorial@plt>
xor    %edi,%edi
call   1040 <assert@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
define i32 @main() {
%1 = alloca i32
store i32 0, i32* %1
%2 = call i32 @factorial(i32 2)
%3 = icmp eq i32 2, %2
%4 = zext i1 %3 to i32
%5 = call i32 @assert(i32 %4)
%6 = call i32 @factorial(i32 3)
%7 = icmp eq i32 6, %6
%8 = zext i1 %7 to i32
%9 = call i32 @assert(i32 %8)
%10 = call i32 @factorial(i32 5)
%11 = icmp eq i32 120, %10
%12 = zext i1 %11 to i32
%13 = call i32 @assert(i32 %12)
%14 = call i32 @factorial(i32 10)
%15 = icmp eq i32 3628800, %14
%16 = zext i1 %15 to i32
%17 = call i32 @assert(i32 %16)
%18 = call i32 @factorial(i32 15)
%19 = sext i32 %18 to i64
%20 = icmp eq i64 1307674368000, %19
%21 = zext i1 %20 to i32
%22 = call i32 @assert(i32 %21)
%23 = call i32 @factorial(i32 20)
%24 = sext i32 %23 to i64
%25 = icmp eq i64 2432902008176640000, %24
%26 = zext i1 %25 to i32
%27 = call i32 @assert(i32 %26)
ret i32 0
}

LLVM IR (-O2):
define i32 @main() {
%1 = tail call i32 @factorial(i32 2)
%2 = icmp eq i32 %1, 2
%3 = zext i1 %2 to i32
%4 = tail call i32 @assert(i32 %3)
%5 = tail call i32 @factorial(i32 3)
%6 = icmp eq i32 %5, 6
%7 = zext i1 %6 to i32
%8 = tail call i32 @assert(i32 %7)
%9 = tail call i32 @factorial(i32 5)
%10 = icmp eq i32 %9, 120
%11 = zext i1 %10 to i32
%12 = tail call i32 @assert(i32 %11)
%13 = tail call i32 @factorial(i32 10)
%14 = icmp eq i32 %13, 3628800
%15 = zext i1 %14 to i32
%16 = tail call i32 @assert(i32 %15)
%17 = tail call i32 @factorial(i32 15)
%18 = tail call i32 @assert(i32 0)
%19 = tail call i32 @factorial(i32 20)
%20 = tail call i32 @assert(i32 0)
ret i32 0
}