#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 *);
int main(void) {
  int age;
  printf("Please enter your age: ");
  scanf("%d", &age);
  if (age < 100) {
    printf("You are pretty young!\n");
  } else if (age == 100) {
    printf("You are old\n");
  } else {
    printf("You are really old!\n");
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
call   1030 <printf@plt>
lea    0xed6(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
cmpl   $0x64,-0x8(%rbp)
jge    1166 <main+0x46>
lea    0xebf(%rip),%rdi
call   1030 <printf@plt>
jmp    1192 <main+0x72>
cmpl   $0x64,-0x8(%rbp)
jne    1181 <main+0x61>
lea    0xebb(%rip),%rdi
call   1030 <printf@plt>
jmp    118d <main+0x6d>
lea    0xeb7(%rip),%rdi
call   1030 <printf@plt>
jmp    1192 <main+0x72>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xec8(%rip),%rdi
call   1040 <printf@plt>
lea    0xed4(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1050 <scanf@plt>
cmpl   $0x64,0x4(%rsp)
lea    0xed5(%rip),%rax
lea    0xeba(%rip),%rcx
cmove  %rax,%rcx
lea    0xecf(%rip),%rdi
cmovge %rcx,%rdi
call   1030 <puts@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [24 x i8] c"Please enter your age: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [23 x i8] c"You are pretty young!\0A\00"
@.str.3 = [13 x i8] c"You are old\0A\00"
@.str.4 = [21 x i8] c"You are really old!\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
store i32 0, i32* %1
%3 = call i32 @printf(i8* getelementptr inbounds ([24 x i8], [24 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* %2)
%5 = load i32, i32* %2
%6 = icmp slt i32 %5, 100
br i1 %6, label %7, label %9
7: ; preds = %0
%8 = call i32 @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.2, i64 0, i64 0))
br label %17
9: ; preds = %0
%10 = load i32, i32* %2
%11 = icmp eq i32 %10, 100
br i1 %11, label %12, label %14
12: ; preds = %9
%13 = call i32 @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.3, i64 0, i64 0))
br label %16
14: ; preds = %9
%15 = call i32 @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.4, i64 0, i64 0))
br label %16
16: ; preds = %14, %12
br label %17
17: ; preds = %16, %7
ret i32 0
}

LLVM IR (-O2):
@.str = [24 x i8] c"Please enter your age: \00"
@.str.1 = [3 x i8] c"%d\00"
@str = [20 x i8] c"You are really old!\00"
@str.5 = [12 x i8] c"You are old\00"
@str.6 = [22 x i8] c"You are pretty young!\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([24 x i8], [24 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 = icmp slt i32 %5, 100
%7 = icmp eq i32 %5, 100
%8 = select i1 %7, i8* getelementptr inbounds ([12 x i8], [12 x i8]* @str.5, i64 0, i64 0), i8* getelementptr inbounds ([20 x i8], [20 x i8]* @str, i64 0, i64 0)
%9 = select i1 %6, i8* getelementptr inbounds ([22 x i8], [22 x i8]* @str.6, i64 0, i64 0), i8* %8
%10 = call i32 @puts(i8* dereferenceable(1) %9)
ret i32 0
}