#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 EXIT_SUCCESS;
int /*<<< orphan*/ fun(int);
int /*<<< orphan*/ gethostname(char *, int);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, int *);
int main(void) {
  int a;
  char hostname[1024];
  gethostname(hostname, 1024);
  printf("Hello %s welcome to world\nEnter fun to go:", hostname);
  scanf("%d", &a);
  printf("scaned number %d\n", a);
  fun(a);
  return EXIT_SUCCESS;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x410,%rsp
movl   $0x0,-0x4(%rbp)
lea    -0x410(%rbp),%rdi
mov    $0x400,%esi
call   1060 <gethostname@plt>
lea    -0x410(%rbp),%rsi
lea    0xe8f(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xeac(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1050 <scanf@plt>
mov    -0x8(%rbp),%esi
lea    0xe9c(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    -0x8(%rbp),%edi
call   1030 <fun@plt>
mov    0x2e38(%rip),%rax
mov    (%rax),%eax
add    $0x410,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x410,%rsp
lea    0x10(%rsp),%rbx
mov    %rbx,%rdi
mov    $0x400,%esi
call   1060 <gethostname@plt>
lea    0xe9f(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xeb9(%rip),%rdi
lea    0xc(%rsp),%rsi
call   1050 <scanf@plt>
mov    0xc(%rsp),%esi
lea    0xea7(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0xc(%rsp),%edi
call   1030 <fun@plt>
mov    0x2e42(%rip),%rax
mov    (%rax),%eax
add    $0x410,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [43 x i8] c"Hello %s welcome to world\0AEnter fun to go:\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [18 x i8] c"scaned number %d\0A\00"
@EXIT_SUCCESS = global i32 0
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca [1024 x i8]
store i32 0, i32* %1
%4 = getelementptr inbounds [1024 x i8], [1024 x i8]* %3, i64 0, i64 0
%5 = call i32 @gethostname(i8* %4, i32 1024)
%6 = getelementptr inbounds [1024 x i8], [1024 x i8]* %3, i64 0, i64 0
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([43 x i8], [43 x i8]* @.str, i64 0, i64 0), i8* %6)
%8 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%9 = load i32, i32* %2
%10 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.2, i64 0, i64 0), i32 %9)
%11 = load i32, i32* %2
%12 = call i32 @fun(i32 %11)
%13 = load i32, i32* @EXIT_SUCCESS
ret i32 %13
}

LLVM IR (-O2):
@.str = [43 x i8] c"Hello %s welcome to world\0AEnter fun to go:\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [18 x i8] c"scaned number %d\0A\00"
@EXIT_SUCCESS = global i32 0
define i32 @main() {
%1 = alloca i32
%2 = alloca [1024 x i8]
%3 = bitcast i32* %1 to i8*
%4 = getelementptr inbounds [1024 x i8], [1024 x i8]* %2, i64 0, i64 0
%5 = call i32 @gethostname(i8* %4, i32 1024)
%6 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([43 x i8], [43 x i8]* @.str, i64 0, i64 0), i8* %4)
%7 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%8 = load i32, i32* %1
%9 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([18 x i8], [18 x i8]* @.str.2, i64 0, i64 0), i32 %8)
%10 = load i32, i32* %1
%11 = call i32 @fun(i32 %10)
%12 = load i32, i32* @EXIT_SUCCESS
ret i32 %12
}