#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 EXIT_FAILURE;
int EXIT_SUCCESS;
int /*<<< orphan*/ atoi(char *);
int /*<<< orphan*/ fak(int /*<<< orphan*/);
int /*<<< orphan*/ gmp_printf(char *, int /*<<< orphan*/);
int /*<<< orphan*/ printf(char *, char *);
int main(int argc, char **argv) {
  if (argc != 2) {
    printf("usage: %s natural number\n", argv[0]);
    return EXIT_FAILURE;
  }
  gmp_printf("Value: %Zd\n", fak(atoi(argv[1])));
  return EXIT_SUCCESS;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x8(%rbp)
je     1184 <main+0x44>
mov    -0x10(%rbp),%rax
mov    (%rax),%rsi
lea    0xe92(%rip),%rdi
call   1030 <printf@plt>
mov    0x2e66(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
jmp    11b2 <main+0x72>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1050 <atoi@plt>
mov    %eax,%edi
call   1040 <fak@plt>
mov    %eax,%esi
lea    0xe79(%rip),%rdi
call   1060 <gmp_printf@plt>
mov    0x2e2b(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
cmp    $0x2,%edi
jne    116d <main+0x2d>
mov    0x8(%rsi),%rdi
call   1050 <atoi@plt>
mov    %eax,%edi
call   1040 <fak@plt>
lea    0xebd(%rip),%rdi
mov    %eax,%esi
call   1060 <gmp_printf@plt>
mov    0x2e6d(%rip),%rax
jmp    1183 <main+0x43>
mov    (%rsi),%rsi
lea    0xe89(%rip),%rdi
call   1030 <printf@plt>
mov    0x2e5d(%rip),%rax
mov    (%rax),%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [26 x i8] c"usage: %s natural number\0A\00"
@EXIT_FAILURE = global i32 0
@.str.1 = [12 x i8] c"Value: %Zd\0A\00"
@EXIT_SUCCESS = global i32 0
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%6 = load i32, i32* %4
%7 = icmp ne i32 %6, 2
br i1 %7, label %8, label %14
8: ; preds = %2
%9 = load i8**, i8*** %5
%10 = getelementptr inbounds i8*, i8** %9, i64 0
%11 = load i8*, i8** %10
%12 = call i32 @printf(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str, i64 0, i64 0), i8* %11)
%13 = load i32, i32* @EXIT_FAILURE
store i32 %13, i32* %3
br label %22
14: ; preds = %2
%15 = load i8**, i8*** %5
%16 = getelementptr inbounds i8*, i8** %15, i64 1
%17 = load i8*, i8** %16
%18 = call i32 @atoi(i8* %17)
%19 = call i32 @fak(i32 %18)
%20 = call i32 @gmp_printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0), i32 %19)
%21 = load i32, i32* @EXIT_SUCCESS
store i32 %21, i32* %3
br label %22
22: ; preds = %14, %8
%23 = load i32, i32* %3
ret i32 %23
}

LLVM IR (-O2):
@.str = [26 x i8] c"usage: %s natural number\0A\00"
@EXIT_FAILURE = global i32 0
@.str.1 = [12 x i8] c"Value: %Zd\0A\00"
@EXIT_SUCCESS = global i32 0
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 2
br i1 %3, label %7, label %4
4: ; preds = %2
%5 = load i8*, i8** %1
%6 = tail call i32 @printf(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str, i64 0, i64 0), i8* %5)
br label %13
7: ; preds = %2
%8 = getelementptr inbounds i8*, i8** %1, i64 1
%9 = load i8*, i8** %8
%10 = tail call i32 @atoi(i8* %9)
%11 = tail call i32 @fak(i32 %10)
%12 = tail call i32 @gmp_printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0), i32 %11)
br label %13
13: ; preds = %7, %4
%14 = phi i32* [ @EXIT_FAILURE, %4 ], [ @EXIT_SUCCESS, %7 ]
%15 = load i32, i32* %14
ret i32 %15
}