#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 */
unsigned long atoi(char *);
unsigned long fibonacci(unsigned long);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int /*<<< orphan*/ printf(char *, unsigned long);
int /*<<< orphan*/ stderr;
int main(int argc, char *argv[]) {
  unsigned long n;
  if (2 != argc) {
    fprintf(stderr, "usage: %s <n>\n", argv[0]);
    return 1;
  }
  n = atoi(argv[1]);
  n = fibonacci(n);
  printf("%li\n", n);
  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)
mov    $0x2,%eax
cmp    -0x8(%rbp),%eax
je     118c <main+0x4c>
mov    0x2e75(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe85(%rip),%rsi
call   1040 <fprintf@plt>
movl   $0x1,-0x4(%rbp)
jmp    11c1 <main+0x81>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1060 <atoi@plt>
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rdi
call   1050 <fibonacci@plt>
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rsi
lea    0xe5a(%rip),%rdi
call   1030 <printf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
cmp    $0x2,%edi
jne    116a <main+0x2a>
mov    0x8(%rsi),%rdi
call   1060 <atoi@plt>
mov    %rax,%rdi
call   1050 <fibonacci@plt>
lea    0xeb1(%rip),%rdi
mov    %rax,%rsi
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret
mov    0x2e6f(%rip),%rax
mov    (%rax),%edi
mov    (%rsi),%rdx
lea    0xe83(%rip),%rsi
call   1040 <fprintf@plt>
mov    $0x1,%eax
pop    %rcx
ret

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

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