#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 */
long Fact(long);
int /*<<< orphan*/ exit(int /*<<< orphan*/);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int /*<<< orphan*/ printf(char *, long, long);
int /*<<< orphan*/ stderr;
long strtol(char *, int /*<<< orphan*/ *, int);
int main(int argc, char *argv[]) {
  long n, nfact;
  if (argc != 2) {
    fprintf(stderr, "usage: %s <n>\n", argv[0]);
    exit(0);
  }
  n = strtol(argv[1], NULL, 10);
  nfact = Fact(n);
  printf("%ld! = %ld\n", n, nfact);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x8(%rbp)
je     1193 <main+0x43>
mov    0x2e69(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe79(%rip),%rsi
call   1050 <fprintf@plt>
xor    %edi,%edi
call   1070 <exit@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
xor    %eax,%eax
mov    %eax,%esi
mov    $0xa,%edx
call   1060 <strtol@plt>
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rdi
call   1030 <Fact@plt>
mov    %rax,-0x20(%rbp)
mov    -0x18(%rbp),%rsi
mov    -0x20(%rbp),%rdx
lea    0xe46(%rip),%rdi
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
cmp    $0x2,%edi
jne    1187 <main+0x37>
mov    0x8(%rsi),%rdi
xor    %esi,%esi
mov    $0xa,%edx
call   1060 <strtol@plt>
mov    %rax,%rbx
mov    %rax,%rdi
call   1030 <Fact@plt>
lea    0xe97(%rip),%rdi
mov    %rbx,%rsi
mov    %rax,%rdx
call   1040 <printf@plt>
xor    %eax,%eax
pop    %rbx
ret
mov    0x2e52(%rip),%rax
mov    (%rax),%edi
mov    (%rsi),%rdx
lea    0xe66(%rip),%rsi
call   1050 <fprintf@plt>
xor    %edi,%edi
call   1070 <exit@plt>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [15 x i8] c"usage: %s <n>\0A\00"
@.str.1 = [12 x i8] c"%ld! = %ld\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i64
%7 = alloca i64
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%8 = load i32, i32* %4
%9 = icmp ne i32 %8, 2
br i1 %9, label %10, label %17
10: ; preds = %2
%11 = load i32, i32* @stderr
%12 = load i8**, i8*** %5
%13 = getelementptr inbounds i8*, i8** %12, i64 0
%14 = load i8*, i8** %13
%15 = call i32 @fprintf(i32 %11, i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i64 0, i64 0), i8* %14)
%16 = call i32 @exit(i32 0)
unreachable
17: ; preds = %2
%18 = load i8**, i8*** %5
%19 = getelementptr inbounds i8*, i8** %18, i64 1
%20 = load i8*, i8** %19
%21 = call i64 @strtol(i8* %20, i32* null, i32 10)
store i64 %21, i64* %6
%22 = load i64, i64* %6
%23 = call i64 @Fact(i64 %22)
store i64 %23, i64* %7
%24 = load i64, i64* %6
%25 = load i64, i64* %7
%26 = call i32 @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0), i64 %24, i64 %25)
ret i32 0
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [15 x i8] c"usage: %s <n>\0A\00"
@.str.1 = [12 x i8] c"%ld! = %ld\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 2
br i1 %3, label %9, label %4
4: ; preds = %2
%5 = load i32, i32* @stderr
%6 = load i8*, i8** %1
%7 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i64 0, i64 0), i8* %6)
%8 = tail call i32 @exit(i32 0)
unreachable
9: ; preds = %2
%10 = getelementptr inbounds i8*, i8** %1, i64 1
%11 = load i8*, i8** %10
%12 = tail call i64 @strtol(i8* nocapture %11, i32* null, i32 10)
%13 = tail call i64 @Fact(i64 %12)
%14 = tail call i32 @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0), i64 %12, i64 %13)
ret i32 0
}