#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;
unsigned long Fibonacci(int);
int atoi(char *);
int /*<<< orphan*/ printf(char *, unsigned long);
int main(int argc, char *argv[]) {
  if (argc != 2) {
    return EXIT_FAILURE;
  }
  int n = atoi(argv[1]);
  if (n < 0) {
    return EXIT_FAILURE;
  }
  unsigned long ans = Fibonacci(n);
  printf("The Fibonacci number is: %lu\n", ans);
  return EXIT_SUCCESS;
}


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     1161 <main+0x31>
mov    0x2e89(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
jmp    11b4 <main+0x84>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1050 <atoi@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
jge    118c <main+0x5c>
mov    0x2e5e(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
jmp    11b4 <main+0x84>
mov    -0x14(%rbp),%edi
call   1030 <Fibonacci@plt>
mov    %rax,-0x20(%rbp)
mov    -0x20(%rbp),%rsi
lea    0xe5d(%rip),%rdi
call   1040 <printf@plt>
mov    0x2e29(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
mov    0x2ea8(%rip),%rbx
cmp    $0x2,%edi
jne    1167 <main+0x37>
mov    0x8(%rsi),%rdi
call   1050 <atoi@plt>
test   %eax,%eax
js     1167 <main+0x37>
mov    %eax,%edi
call   1030 <Fibonacci@plt>
lea    0xea8(%rip),%rdi
mov    %rax,%rsi
call   1040 <printf@plt>
mov    0x2e71(%rip),%rbx
mov    (%rbx),%eax
pop    %rbx
ret

LLVM IR (-O0):
@EXIT_FAILURE = global i32 0
@.str = [30 x i8] c"The Fibonacci number is: %lu\0A\00"
@EXIT_SUCCESS = global i32 0
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%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 %12
10: ; preds = %2
%11 = load i32, i32* @EXIT_FAILURE
store i32 %11, i32* %3
br label %27
12: ; preds = %2
%13 = load i8**, i8*** %5
%14 = getelementptr inbounds i8*, i8** %13, i64 1
%15 = load i8*, i8** %14
%16 = call i32 @atoi(i8* %15)
store i32 %16, i32* %6
%17 = load i32, i32* %6
%18 = icmp slt i32 %17, 0
br i1 %18, label %19, label %21
19: ; preds = %12
%20 = load i32, i32* @EXIT_FAILURE
store i32 %20, i32* %3
br label %27
21: ; preds = %12
%22 = load i32, i32* %6
%23 = call i64 @Fibonacci(i32 %22)
store i64 %23, i64* %7
%24 = load i64, i64* %7
%25 = call i32 @printf(i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str, i64 0, i64 0), i64 %24)
%26 = load i32, i32* @EXIT_SUCCESS
store i32 %26, i32* %3
br label %27
27: ; preds = %21, %19, %10
%28 = load i32, i32* %3
ret i32 %28
}

LLVM IR (-O2):
@EXIT_FAILURE = global i32 0
@.str = [30 x i8] c"The Fibonacci number is: %lu\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 %4, label %12
4: ; preds = %2
%5 = getelementptr inbounds i8*, i8** %1, i64 1
%6 = load i8*, i8** %5
%7 = tail call i32 @atoi(i8* %6)
%8 = icmp slt i32 %7, 0
br i1 %8, label %12, label %9
9: ; preds = %4
%10 = tail call i64 @Fibonacci(i32 %7)
%11 = tail call i32 @printf(i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str, i64 0, i64 0), i64 %10)
br label %12
12: ; preds = %9, %4, %2
%13 = phi i32* [ @EXIT_FAILURE, %2 ], [ @EXIT_SUCCESS, %9 ], [ @EXIT_FAILURE, %4 ]
%14 = load i32, i32* %13
ret i32 %14
}