#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 */
scalar_t__ isprime(int, int);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, int *);
int main() {
  int num, i;
  printf("Enter a number: ");
  scanf("%d", &num);
  if (isprime(num, num / 2))
    printf("%d is a prime number\n", num);
  else
    printf("%d is not a prime number\n", num);
  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   1030 <printf@plt>
lea    0xebd(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1050 <scanf@plt>
mov    -0x8(%rbp),%edi
mov    -0x8(%rbp),%eax
mov    $0x2,%ecx
cltd
idiv   %ecx
mov    %eax,%esi
call   1040 <isprime@plt>
cmp    $0x0,%rax
je     1192 <main+0x62>
mov    -0x8(%rbp),%esi
lea    0xe8e(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    11a3 <main+0x73>
mov    -0x8(%rbp),%esi
lea    0xe8e(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xec8(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xecb(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1050 <scanf@plt>
mov    0x4(%rsp),%edi
mov    %edi,%esi
shr    $0x1f,%esi
add    %edi,%esi
sar    %esi
call   1040 <isprime@plt>
test   %rax,%rax
mov    0x4(%rsp),%esi
lea    0xeba(%rip),%rax
lea    0xe9d(%rip),%rdi
cmove  %rax,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [17 x i8] c"Enter a number: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [22 x i8] c"%d is a prime number\0A\00"
@.str.3 = [26 x i8] c"%d is not a prime number\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 ([17 x i8], [17 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 = load i32, i32* %2
%8 = sdiv i32 %7, 2
%9 = call i64 @isprime(i32 %6, i32 %8)
%10 = icmp ne i64 %9, 0
br i1 %10, label %11, label %14
11: ; preds = %0
%12 = load i32, i32* %2
%13 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str.2, i64 0, i64 0), i32 %12)
br label %17
14: ; preds = %0
%15 = load i32, i32* %2
%16 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.3, i64 0, i64 0), i32 %15)
br label %17
17: ; preds = %14, %11
ret i32 0
}

LLVM IR (-O2):
@.str = [17 x i8] c"Enter a number: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [22 x i8] c"%d is a prime number\0A\00"
@.str.3 = [26 x i8] c"%d is not a prime number\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 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 = sdiv i32 %5, 2
%7 = call i64 @isprime(i32 %5, i32 %6)
%8 = icmp eq i64 %7, 0
%9 = load i32, i32* %1
%10 = select i1 %8, i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.3, i64 0, i64 0), i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str.2, i64 0, i64 0)
%11 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) %10, i32 %9)
ret i32 0
}