#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 fibonacci(int);
int /*<<< orphan*/ print_usage();
int /*<<< orphan*/ printf(char *, int, int);
int main(int argc, char **argv) {
  if (argc <= 1) {
    print_usage();
    return (1);
  }
  int n = atoi(argv[1]);
  if (n < 0) {
    print_usage();
    return (2);
  }
  int fib = fibonacci(n);
  printf("fibonacci(%d) = %d\n", n, fib);
  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   $0x1,-0x8(%rbp)
jg     1173 <main+0x33>
mov    $0x0,%al
call   1060 <print_usage@plt>
movl   $0x1,-0x4(%rbp)
jmp    11c4 <main+0x84>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1050 <atoi@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
jge    11a0 <main+0x60>
mov    $0x0,%al
call   1060 <print_usage@plt>
movl   $0x2,-0x4(%rbp)
jmp    11c4 <main+0x84>
mov    -0x14(%rbp),%edi
call   1040 <fibonacci@plt>
mov    %eax,-0x18(%rbp)
mov    -0x14(%rbp),%esi
mov    -0x18(%rbp),%edx
lea    0xe48(%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    $0x1,%edi
jg     1154 <main+0x14>
xor    %eax,%eax
call   1060 <print_usage@plt>
mov    $0x1,%eax
pop    %rbx
ret
mov    0x8(%rsi),%rdi
call   1050 <atoi@plt>
test   %eax,%eax
js     117e <main+0x3e>
mov    %eax,%ebx
mov    %eax,%edi
call   1040 <fibonacci@plt>
lea    0xe8f(%rip),%rdi
mov    %ebx,%esi
mov    %eax,%edx
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rbx
ret
xor    %eax,%eax
call   1060 <print_usage@plt>
mov    $0x2,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [20 x i8] c"fibonacci(%d) = %d\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 sle i32 %8, 1
br i1 %9, label %10, label %12
10: ; preds = %2
%11 = call i32 (...) @print_usage()
store i32 1, 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 = call i32 (...) @print_usage()
store i32 2, i32* %3
br label %27
21: ; preds = %12
%22 = load i32, i32* %6
%23 = call i32 @fibonacci(i32 %22)
store i32 %23, i32* %7
%24 = load i32, i32* %6
%25 = load i32, i32* %7
%26 = call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i32 %24, i32 %25)
store i32 0, i32* %3
br label %27
27: ; preds = %21, %19, %10
%28 = load i32, i32* %3
ret i32 %28
}

LLVM IR (-O2):
@.str = [20 x i8] c"fibonacci(%d) = %d\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp slt i32 %0, 2
br i1 %3, label %4, label %6
4: ; preds = %2
%5 = tail call i32 (...) @print_usage()
br label %16
6: ; preds = %2
%7 = getelementptr inbounds i8*, i8** %1, i64 1
%8 = load i8*, i8** %7
%9 = tail call i32 @atoi(i8* %8)
%10 = icmp slt i32 %9, 0
br i1 %10, label %11, label %13
11: ; preds = %6
%12 = tail call i32 (...) @print_usage()
br label %16
13: ; preds = %6
%14 = tail call i32 @fibonacci(i32 %9)
%15 = tail call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i32 %9, i32 %14)
br label %16
16: ; preds = %11, %13, %4
%17 = phi i32 [ 1, %4 ], [ 2, %11 ], [ 0, %13 ]
ret i32 %17
}