#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 */
struct node {
  int dummy;
};

/* Variables and functions */
int /*<<< orphan*/ atoi(char *);
struct node *create_sll_r(int /*<<< orphan*/);
int /*<<< orphan*/ free_sll_r(struct node *);
int /*<<< orphan*/ print_sll_r(struct node *);
int /*<<< orphan*/ print_sll_reverse_r(struct node *);
int /*<<< orphan*/ printf(char *);
int main(int argc, char *argv[]) {
  if (argc != 2) {
    printf("Please enter <num_of_nodes> in the sll.\n");
    return -1;
  }
  struct node *head = create_sll_r(atoi(argv[1]));
  print_sll_r(head);
  print_sll_reverse_r(head);
  printf("\n");
  free_sll_r(head);
}


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     1198 <main+0x38>
lea    0xe79(%rip),%rdi
call   1050 <printf@plt>
movl   $0xffffffff,-0x4(%rbp)
jmp    11d7 <main+0x77>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1080 <atoi@plt>
mov    %eax,%edi
call   1060 <create_sll_r@plt>
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rdi
call   1070 <print_sll_r@plt>
mov    -0x18(%rbp),%rdi
call   1040 <print_sll_reverse_r@plt>
lea    0xe5e(%rip),%rdi
call   1050 <printf@plt>
mov    -0x18(%rbp),%rdi
call   1030 <free_sll_r@plt>
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
cmp    $0x2,%edi
jne    11af <main+0x3f>
mov    0x8(%rsi),%rdi
call   1090 <atoi@plt>
mov    %eax,%edi
call   1070 <create_sll_r@plt>
mov    %rax,%rbx
mov    %rax,%rdi
call   1080 <print_sll_r@plt>
mov    %rbx,%rdi
call   1060 <print_sll_reverse_r@plt>
mov    $0xa,%edi
call   1030 <putchar@plt>
mov    %rbx,%rdi
call   1050 <free_sll_r@plt>
xor    %eax,%eax
pop    %rbx
ret
lea    0xe4a(%rip),%rdi
call   1040 <puts@plt>
mov    $0xffffffff,%eax
pop    %rbx
ret

LLVM IR (-O0):
%struct.node = type { i32 }
@.str = [41 x i8] c"Please enter <num_of_nodes> in the sll.\0A\00"
@.str.1 = [2 x i8] c"\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca %struct.node*
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%7 = load i32, i32* %4
%8 = icmp ne i32 %7, 2
br i1 %8, label %9, label %11
9: ; preds = %2
%10 = call i32 @printf(i8* getelementptr inbounds ([41 x i8], [41 x i8]* @.str, i64 0, i64 0))
store i32 -1, i32* %3
br label %24
11: ; preds = %2
%12 = load i8**, i8*** %5
%13 = getelementptr inbounds i8*, i8** %12, i64 1
%14 = load i8*, i8** %13
%15 = call i32 @atoi(i8* %14)
%16 = call %struct.node* @create_sll_r(i32 %15)
store %struct.node* %16, %struct.node** %6
%17 = load %struct.node*, %struct.node** %6
%18 = call i32 @print_sll_r(%struct.node* %17)
%19 = load %struct.node*, %struct.node** %6
%20 = call i32 @print_sll_reverse_r(%struct.node* %19)
%21 = call i32 @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%22 = load %struct.node*, %struct.node** %6
%23 = call i32 @free_sll_r(%struct.node* %22)
br label %24
24: ; preds = %11, %9
%25 = load i32, i32* %3
ret i32 %25
}

LLVM IR (-O2):
%struct.node = type { i32 }
@str = [40 x i8] c"Please enter <num_of_nodes> in the sll.\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 ([40 x i8], [40 x i8]* @str, i64 0, i64 0))
br label %15
6: ; preds = %2
%7 = getelementptr inbounds i8*, i8** %1, i64 1
%8 = load i8*, i8** %7
%9 = tail call i32 @atoi(i8* %8)
%10 = tail call %struct.node* @create_sll_r(i32 %9)
%11 = tail call i32 @print_sll_r(%struct.node* %10)
%12 = tail call i32 @print_sll_reverse_r(%struct.node* %10)
%13 = tail call i32 @putchar(i32 10)
%14 = tail call i32 @free_sll_r(%struct.node* %10)
br label %15
15: ; preds = %6, %4
%16 = phi i32 [ -1, %4 ], [ 0, %6 ]
ret i32 %16
}