#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 *);
void main() {
  int isPrime(int);
  int a;
  printf("Enter a number:\n");
  scanf("%d", &a);
  if (isPrime(a)) {
    printf("a=%d is a prime number", a);
  } else {
    printf("a=%d is not a prime number", a);
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
lea    0xec1(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xec4(%rip),%rdi
lea    -0x4(%rbp),%rsi
call   1050 <scanf@plt>
mov    -0x4(%rbp),%edi
call   1040 <isPrime@plt>
cmp    $0x0,%eax
je     117d <main+0x4d>
mov    -0x4(%rbp),%esi
lea    0xea3(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    118e <main+0x5e>
mov    -0x4(%rbp),%esi
lea    0xea4(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xeed(%rip),%rdi
call   1030 <puts@plt>
lea    0xeac(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1060 <scanf@plt>
mov    0x4(%rsp),%edi
call   1050 <isPrime@plt>
test   %eax,%eax
mov    0x4(%rsp),%esi
lea    0xea6(%rip),%rax
lea    0xe88(%rip),%rdi
cmove  %rax,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
pop    %rax
ret

LLVM IR (-O0):
@.str = [17 x i8] c"Enter a number:\0A\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [23 x i8] c"a=%d is a prime number\00"
@.str.3 = [27 x i8] c"a=%d is not a prime number\00"
define void @main() {
%1 = alloca i32
%2 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0))
%3 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%4 = load i32, i32* %1
%5 = call i32 @isPrime(i32 %4)
%6 = icmp ne i32 %5, 0
br i1 %6, label %7, label %10
7: ; preds = %0
%8 = load i32, i32* %1
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.2, i64 0, i64 0), i32 %8)
br label %13
10: ; preds = %0
%11 = load i32, i32* %1
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.3, i64 0, i64 0), i32 %11)
br label %13
13: ; preds = %10, %7
ret void
}

LLVM IR (-O2):
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [23 x i8] c"a=%d is a prime number\00"
@.str.3 = [27 x i8] c"a=%d is not a prime number\00"
@str = [16 x i8] c"Enter a number:\00"
define void @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 @puts(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 = call i32 @isPrime(i32 %5)
%7 = icmp eq i32 %6, 0
%8 = load i32, i32* %1
%9 = select i1 %7, i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.3, i64 0, i64 0), i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.2, i64 0, i64 0)
%10 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) %9, i32 %8)
ret void
}