#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 atoi(char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int /*<<< orphan*/ next_fibonacci_num();
int /*<<< orphan*/ printf(char *, int /*<<< orphan*/);
int /*<<< orphan*/ stderr;
int main(int argc, char **argv) {
  if (argc != 2) {
    fprintf(stderr, "usage: %s <N>\n", argv[0]);
    return 1;
  }
  int N = atoi(argv[1]);
  if (N < 0)
    return 1;
  for (int i = 0; i < N; i++)
    next_fibonacci_num();
  printf("%ld\n", next_fibonacci_num());
  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     1188 <main+0x48>
mov    0x2e79(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe89(%rip),%rsi
call   1040 <fprintf@plt>
movl   $0x1,-0x4(%rbp)
jmp    11f2 <main+0xb2>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1060 <atoi@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
jge    11ae <main+0x6e>
movl   $0x1,-0x4(%rbp)
jmp    11f2 <main+0xb2>
movl   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%eax
cmp    -0x14(%rbp),%eax
jge    11d6 <main+0x96>
mov    $0x0,%al
call   1050 <next_fibonacci_num@plt>
mov    -0x18(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x18(%rbp)
jmp    11b5 <main+0x75>
mov    $0x0,%al
call   1050 <next_fibonacci_num@plt>
mov    %eax,%esi
lea    0xe29(%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   %rbx
cmp    $0x2,%edi
jne    1185 <main+0x45>
mov    0x8(%rsi),%rdi
call   1060 <atoi@plt>
test   %eax,%eax
js     119d <main+0x5d>
je     116c <main+0x2c>
mov    %eax,%ebx
nopw   0x0(%rax,%rax,1)
xor    %eax,%eax
call   1050 <next_fibonacci_num@plt>
add    $0xffffffff,%ebx
jne    1160 <main+0x20>
xor    %ebx,%ebx
xor    %eax,%eax
call   1050 <next_fibonacci_num@plt>
lea    0xe93(%rip),%rdi
mov    %eax,%esi
call   1030 <printf@plt>
jmp    11a2 <main+0x62>
mov    0x2e54(%rip),%rax
mov    (%rax),%edi
mov    (%rsi),%rdx
lea    0xe68(%rip),%rsi
call   1040 <fprintf@plt>
mov    $0x1,%ebx
mov    %ebx,%eax
pop    %rbx
ret

LLVM IR (-O0):
@stderr = global i32 0
@.str = [15 x i8] c"usage: %s <N>\0A\00"
@.str.1 = [5 x i8] c"%ld\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i32
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 %16
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)
store i32 1, i32* %3
br label %37
16: ; preds = %2
%17 = load i8**, i8*** %5
%18 = getelementptr inbounds i8*, i8** %17, i64 1
%19 = load i8*, i8** %18
%20 = call i32 @atoi(i8* %19)
store i32 %20, i32* %6
%21 = load i32, i32* %6
%22 = icmp slt i32 %21, 0
br i1 %22, label %23, label %24
23: ; preds = %16
store i32 1, i32* %3
br label %37
24: ; preds = %16
store i32 0, i32* %7
br label %25
25: ; preds = %31, %24
%26 = load i32, i32* %7
%27 = load i32, i32* %6
%28 = icmp slt i32 %26, %27
br i1 %28, label %29, label %34
29: ; preds = %25
%30 = call i32 (...) @next_fibonacci_num()
br label %31
31: ; preds = %29
%32 = load i32, i32* %7
%33 = add nsw i32 %32, 1
store i32 %33, i32* %7
br label %25
34: ; preds = %25
%35 = call i32 (...) @next_fibonacci_num()
%36 = call i32 @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i32 %35)
store i32 0, i32* %3
br label %37
37: ; preds = %34, %23, %10
%38 = load i32, i32* %3
ret i32 %38
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [15 x i8] c"usage: %s <N>\0A\00"
@.str.1 = [5 x i8] c"%ld\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 %23
8: ; preds = %2
%9 = getelementptr inbounds i8*, i8** %1, i64 1
%10 = load i8*, i8** %9
%11 = tail call i32 @atoi(i8* %10)
%12 = icmp slt i32 %11, 0
br i1 %12, label %23, label %13
13: ; preds = %8
%14 = icmp eq i32 %11, 0
br i1 %14, label %15, label %18
15: ; preds = %18, %13
%16 = tail call i32 (...) @next_fibonacci_num()
%17 = tail call i32 @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i32 %16)
br label %23
18: ; preds = %13, %18
%19 = phi i32 [ %21, %18 ], [ 0, %13 ]
%20 = tail call i32 (...) @next_fibonacci_num()
%21 = add nuw nsw i32 %19, 1
%22 = icmp eq i32 %21, %11
br i1 %22, label %15, label %18
23: ; preds = %15, %8, %4
%24 = phi i32 [ 1, %4 ], [ 0, %15 ], [ 1, %8 ]
ret i32 %24
}