#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 *);
long fib(int);
int /*<<< orphan*/ printf(char *, ...);
int main(int argc, char **argv) {
  int x = 0;
  long result = 0;
  if (argc != 2) {
    printf("0\n");
    return 1;
  }
  x = atoi(argv[1]);
  if (x < 0) {
    printf("0\n");
    return 1;
  }
  result = fib(x);
  printf("%ld\n", result);
  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)
movl   $0x0,-0x14(%rbp)
movq   $0x0,-0x20(%rbp)
cmpl   $0x2,-0x8(%rbp)
je     1179 <main+0x49>
lea    0xe9a(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x1,-0x4(%rbp)
jmp    11d2 <main+0xa2>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1050 <atoi@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
jge    11ad <main+0x7d>
lea    0xe66(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x1,-0x4(%rbp)
jmp    11d2 <main+0xa2>
mov    -0x14(%rbp),%edi
call   1040 <fib@plt>
mov    %rax,-0x20(%rbp)
mov    -0x20(%rbp),%rsi
lea    0xe3f(%rip),%rdi
mov    $0x0,%al
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    116f <main+0x2f>
mov    0x8(%rsi),%rdi
call   1060 <atoi@plt>
test   %eax,%eax
js     116f <main+0x2f>
mov    %eax,%edi
call   1050 <fib@plt>
lea    0xe9f(%rip),%rdi
xor    %ebx,%ebx
mov    %rax,%rsi
xor    %eax,%eax
call   1040 <printf@plt>
jmp    1180 <main+0x40>
lea    0xe8f(%rip),%rdi
call   1030 <puts@plt>
mov    $0x1,%ebx
mov    %ebx,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [3 x i8] c"0\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 i64
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
store i32 0, i32* %6
store i64 0, i64* %7
%8 = load i32, i32* %4
%9 = icmp ne i32 %8, 2
br i1 %9, label %10, label %12
10: ; preds = %2
%11 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
store i32 1, i32* %3
br label %26
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 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
store i32 1, i32* %3
br label %26
21: ; preds = %12
%22 = load i32, i32* %6
%23 = call i64 @fib(i32 %22)
store i64 %23, i64* %7
%24 = load i64, i64* %7
%25 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i64 %24)
store i32 0, i32* %3
br label %26
26: ; preds = %21, %19, %10
%27 = load i32, i32* %3
ret i32 %27
}

LLVM IR (-O2):
@.str.1 = [5 x i8] c"%ld\0A\00"
@str.2 = [2 x i8] c"0\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 2
br i1 %3, label %6, label %4
4: ; preds = %2
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([2 x i8], [2 x i8]* @str.2, i64 0, i64 0))
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 @puts(i8* dereferenceable(1) getelementptr inbounds ([2 x i8], [2 x i8]* @str.2, i64 0, i64 0))
br label %16
13: ; preds = %6
%14 = tail call i64 @fib(i32 %9)
%15 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i64 %14)
br label %16
16: ; preds = %13, %11, %4
%17 = phi i32 [ 1, %4 ], [ 1, %11 ], [ 0, %13 ]
ret i32 %17
}