#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 factorial(int);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, int *);
int main() {
  int enter;
  printf("Input: \n");
  printf("Enter a number larger than 0 to find the factorial of: ");
  scanf("%d", &enter);
  printf("Output: \n");
  printf("%d \n", factorial(enter));
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeba(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xeb5(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xedf(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1050 <scanf@plt>
lea    0xed2(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    -0x8(%rbp),%edi
call   1030 <factorial@plt>
mov    %eax,%esi
lea    0xec4(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xef8(%rip),%rdi
call   1030 <puts@plt>
lea    0xeac(%rip),%rdi
xor    %eax,%eax
call   1050 <printf@plt>
lea    0xed6(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1060 <scanf@plt>
lea    0xed5(%rip),%rdi
call   1030 <puts@plt>
mov    0x4(%rsp),%edi
call   1040 <factorial@plt>
lea    0xeb3(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1050 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [9 x i8] c"Input: \0A\00"
@.str.1 = [56 x i8] c"Enter a number larger than 0 to find the factorial of: \00"
@.str.2 = [3 x i8] c"%d\00"
@.str.3 = [10 x i8] c"Output: \0A\00"
@.str.4 = [5 x i8] c"%d \0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
store i32 0, i32* %1
%3 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0))
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([56 x i8], [56 x i8]* @.str.1, i64 0, i64 0))
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32* %2)
%6 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.3, i64 0, i64 0))
%7 = load i32, i32* %2
%8 = call i32 @factorial(i32 %7)
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.4, i64 0, i64 0), i32 %8)
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [56 x i8] c"Enter a number larger than 0 to find the factorial of: \00"
@.str.2 = [3 x i8] c"%d\00"
@.str.4 = [5 x i8] c"%d \0A\00"
@str = [8 x i8] c"Input: \00"
@str.5 = [9 x i8] c"Output: \00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @str, i64 0, i64 0))
%4 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([56 x i8], [56 x i8]* @.str.1, i64 0, i64 0))
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32* %1)
%6 = call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([9 x i8], [9 x i8]* @str.5, i64 0, i64 0))
%7 = load i32, i32* %1
%8 = call i32 @factorial(i32 %7)
%9 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str.4, i64 0, i64 0), i32 %8)
ret i32 0
}