#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 move_disk(int, char, char, char);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, int *);
int main() {
  printf("Enter the number of disks = ");
  int disk;
  scanf("%d", &disk);
  if (disk < 1) {
    printf("Invalid number of disks.\n");
    return 1;
  }
  int count = move_disk(disk, 'A', 'C', 'B');
  printf("\nTotal number of steps required to solve this problem are = "
         "%d\n",
         count);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeba(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xec9(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1050 <scanf@plt>
cmpl   $0x1,-0x8(%rbp)
jge    1181 <main+0x51>
lea    0xeb2(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
movl   $0x1,-0x4(%rbp)
jmp    11b3 <main+0x83>
mov    -0x8(%rbp),%edi
mov    $0x41,%esi
mov    $0x43,%edx
mov    $0x42,%ecx
call   1030 <move_disk@plt>
mov    %eax,-0xc(%rbp)
mov    -0xc(%rbp),%esi
lea    0xe95(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x10,%rsp
lea    0xeb4(%rip),%rdi
xor    %ebx,%ebx
xor    %eax,%eax
call   1050 <printf@plt>
lea    0xec1(%rip),%rdi
lea    0xc(%rsp),%rsi
call   1060 <scanf@plt>
mov    0xc(%rsp),%edi
test   %edi,%edi
jle    1194 <main+0x54>
mov    $0x41,%esi
mov    $0x43,%edx
mov    $0x42,%ecx
call   1030 <move_disk@plt>
lea    0xe97(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1050 <printf@plt>
jmp    11a5 <main+0x65>
lea    0xec5(%rip),%rdi
call   1040 <puts@plt>
mov    $0x1,%ebx
mov    %ebx,%eax
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [29 x i8] c"Enter the number of disks = \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [26 x i8] c"Invalid number of disks.\0A\00"
@.str.3 = [64 x i8] c"\0ATotal number of steps required to solve this problem are = %d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str, i64 0, i64 0))
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%6 = load i32, i32* %2
%7 = icmp slt i32 %6, 1
br i1 %7, label %8, label %10
8: ; preds = %0
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.2, i64 0, i64 0))
store i32 1, i32* %1
br label %15
10: ; preds = %0
%11 = load i32, i32* %2
%12 = call i32 @move_disk(i32 %11, i8 signext 65, i8 signext 67, i8 signext 66)
store i32 %12, i32* %3
%13 = load i32, i32* %3
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([64 x i8], [64 x i8]* @.str.3, i64 0, i64 0), i32 %13)
store i32 0, i32* %1
br label %15
15: ; preds = %10, %8
%16 = load i32, i32* %1
ret i32 %16
}

LLVM IR (-O2):
@.str = [29 x i8] c"Enter the number of disks = \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.3 = [64 x i8] c"\0ATotal number of steps required to solve this problem are = %d\0A\00"
@str = [25 x i8] c"Invalid number of disks.\00"
define i32 @main() {
%1 = alloca i32
%2 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([29 x i8], [29 x i8]* @.str, i64 0, i64 0))
%3 = bitcast i32* %1 to i8*
%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 %9
7: ; preds = %0
%8 = call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @str, i64 0, i64 0))
br label %12
9: ; preds = %0
%10 = call i32 @move_disk(i32 %5, i8 signext 65, i8 signext 67, i8 signext 66)
%11 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([64 x i8], [64 x i8]* @.str.3, i64 0, i64 0), i32 %10)
br label %12
12: ; preds = %9, %7
%13 = phi i32 [ 1, %7 ], [ 0, %9 ]
ret i32 %13
}