#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 /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, int *);
int main() {
  int x = 0;
  int y = 0;
  int z = 0;
  int n = 0;
  int i = 0;
  printf("Please enter N:");
  scanf("%d", &n);
  if (n <= 0) {
    printf("Please enter valid N:");
    scanf("%d", &n);
  }
  x = 0;
  y = 1;
  while (i < n) {
    printf("%d ", x);
    z = x + y;
    y = x;
    x = z;
    i = i + 1;
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0x8(%rbp)
movl   $0x0,-0xc(%rbp)
movl   $0x0,-0x10(%rbp)
movl   $0x0,-0x14(%rbp)
movl   $0x0,-0x18(%rbp)
lea    0xea7(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xea9(%rip),%rdi
lea    -0x14(%rbp),%rsi
call   1040 <scanf@plt>
cmpl   $0x0,-0x14(%rbp)
jg     1198 <main+0x78>
lea    0xe92(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xe81(%rip),%rdi
lea    -0x14(%rbp),%rsi
call   1040 <scanf@plt>
movl   $0x0,-0x8(%rbp)
movl   $0x1,-0xc(%rbp)
mov    -0x18(%rbp),%eax
cmp    -0x14(%rbp),%eax
jge    11e6 <main+0xc6>
mov    -0x8(%rbp),%esi
lea    0xe6d(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%eax
add    -0xc(%rbp),%eax
mov    %eax,-0x10(%rbp)
mov    -0x8(%rbp),%eax
mov    %eax,-0xc(%rbp)
mov    -0x10(%rbp),%eax
mov    %eax,-0x8(%rbp)
mov    -0x18(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x18(%rbp)
jmp    11a6 <main+0x86>
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
movl   $0x0,0x4(%rsp)
lea    0xeca(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xecc(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1040 <scanf@plt>
cmpl   $0x0,0x4(%rsp)
jg     117b <main+0x5b>
lea    0xeb7(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xea6(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1040 <scanf@plt>
cmpl   $0x0,0x4(%rsp)
jle    11af <main+0x8f>
mov    $0x1,%r15d
lea    0xea1(%rip),%r14
xor    %ebx,%ebx
xor    %ebp,%ebp
nopl   0x0(%rax)
mov    %r14,%rdi
mov    %ebp,%esi
xor    %eax,%eax
call   1030 <printf@plt>
mov    %r15d,%eax
add    %ebp,%eax
add    $0x1,%ebx
mov    %ebp,%r15d
mov    %eax,%ebp
cmp    0x4(%rsp),%ebx
jl     1190 <main+0x70>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [16 x i8] c"Please enter N:\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [22 x i8] c"Please enter valid N:\00"
@.str.3 = [4 x i8] c"%d \00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
%6 = alloca i32
store i32 0, i32* %1
store i32 0, i32* %2
store i32 0, i32* %3
store i32 0, i32* %4
store i32 0, i32* %5
store i32 0, i32* %6
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0))
%8 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %5)
%9 = load i32, i32* %5
%10 = icmp sle i32 %9, 0
br i1 %10, label %11, label %14
11: ; preds = %0
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str.2, i64 0, i64 0))
%13 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %5)
br label %14
14: ; preds = %11, %0
store i32 0, i32* %2
store i32 1, i32* %3
br label %15
15: ; preds = %19, %14
%16 = load i32, i32* %6
%17 = load i32, i32* %5
%18 = icmp slt i32 %16, %17
br i1 %18, label %19, label %29
19: ; preds = %15
%20 = load i32, i32* %2
%21 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i32 %20)
%22 = load i32, i32* %2
%23 = load i32, i32* %3
%24 = add nsw i32 %22, %23
store i32 %24, i32* %4
%25 = load i32, i32* %2
store i32 %25, i32* %3
%26 = load i32, i32* %4
store i32 %26, i32* %2
%27 = load i32, i32* %6
%28 = add nsw i32 %27, 1
store i32 %28, i32* %6
br label %15
29: ; preds = %15
%30 = load i32, i32* %1
ret i32 %30
}

LLVM IR (-O2):
@.str = [16 x i8] c"Please enter N:\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [22 x i8] c"Please enter valid N:\00"
@.str.3 = [4 x i8] c"%d \00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
store i32 0, i32* %1
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%5 = load i32, i32* %1
%6 = icmp slt i32 %5, 1
br i1 %6, label %7, label %12
7: ; preds = %0
%8 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([22 x i8], [22 x i8]* @.str.2, i64 0, i64 0))
%9 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%10 = load i32, i32* %1
%11 = icmp sgt i32 %10, 0
br i1 %11, label %12, label %22
12: ; preds = %0, %7
br label %13
13: ; preds = %12, %13
%14 = phi i32 [ %19, %13 ], [ 0, %12 ]
%15 = phi i32 [ %16, %13 ], [ 1, %12 ]
%16 = phi i32 [ %18, %13 ], [ 0, %12 ]
%17 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i32 %16)
%18 = add nsw i32 %15, %16
%19 = add nuw nsw i32 %14, 1
%20 = load i32, i32* %1
%21 = icmp slt i32 %19, %20
br i1 %21, label %13, label %22
22: ; preds = %13, %7
ret i32 0
}