#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 *, unsigned long);
int main() {
  unsigned long int a = 1, b = 2, temp = 0, sum = 0;
  while (b < 4000000) {
    if (b % 2 == 0)
      sum += b;
    temp = b;
    b += a;
    a = temp;
  }
  printf("sum = %ld", sum);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
movl   $0x0,-0x4(%rbp)
movq   $0x1,-0x10(%rbp)
movq   $0x2,-0x18(%rbp)
movq   $0x0,-0x20(%rbp)
movq   $0x0,-0x28(%rbp)
cmpq   $0x3d0900,-0x18(%rbp)
jae    118c <main+0x7c>
mov    -0x18(%rbp),%rax
and    $0x1,%rax
cmp    $0x0,%rax
jne    116b <main+0x5b>
mov    -0x18(%rbp),%rax
add    -0x28(%rbp),%rax
mov    %rax,-0x28(%rbp)
mov    -0x18(%rbp),%rax
mov    %rax,-0x20(%rbp)
mov    -0x10(%rbp),%rax
add    -0x18(%rbp),%rax
mov    %rax,-0x18(%rbp)
mov    -0x20(%rbp),%rax
mov    %rax,-0x10(%rbp)
jmp    113f <main+0x2f>
mov    -0x28(%rbp),%rsi
lea    0xe69(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
mov    $0x1,%eax
mov    $0x2,%ecx
xor    %esi,%esi
nopl   0x0(%rax)
mov    %rcx,%rdx
test   $0x1,%dl
mov    $0x0,%ecx
cmove  %rdx,%rcx
add    %rcx,%rsi
add    %rdx,%rax
mov    %rax,%rcx
cmp    $0x3d0900,%rax
mov    %rdx,%rax
jb     1120 <main+0x10>
push   %rax
lea    0xeb5(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [10 x i8] c"sum = %ld\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i64
%3 = alloca i64
%4 = alloca i64
%5 = alloca i64
store i32 0, i32* %1
store i64 1, i64* %2
store i64 2, i64* %3
store i64 0, i64* %4
store i64 0, i64* %5
br label %6
6: ; preds = %17, %0
%7 = load i64, i64* %3
%8 = icmp ult i64 %7, 4000000
br i1 %8, label %9, label %23
9: ; preds = %6
%10 = load i64, i64* %3
%11 = urem i64 %10, 2
%12 = icmp eq i64 %11, 0
br i1 %12, label %13, label %17
13: ; preds = %9
%14 = load i64, i64* %3
%15 = load i64, i64* %5
%16 = add i64 %15, %14
store i64 %16, i64* %5
br label %17
17: ; preds = %13, %9
%18 = load i64, i64* %3
store i64 %18, i64* %4
%19 = load i64, i64* %2
%20 = load i64, i64* %3
%21 = add i64 %20, %19
store i64 %21, i64* %3
%22 = load i64, i64* %4
store i64 %22, i64* %2
br label %6
23: ; preds = %6
%24 = load i64, i64* %5
%25 = call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i64 %24)
ret i32 0
}

LLVM IR (-O2):
@.str = [10 x i8] c"sum = %ld\00"
define i32 @main() {
br label %1
1: ; preds = %0, %1
%2 = phi i64 [ 0, %0 ], [ %8, %1 ]
%3 = phi i64 [ 2, %0 ], [ %9, %1 ]
%4 = phi i64 [ 1, %0 ], [ %3, %1 ]
%5 = and i64 %3, 1
%6 = icmp eq i64 %5, 0
%7 = select i1 %6, i64 %3, i64 0
%8 = add i64 %7, %2
%9 = add i64 %3, %4
%10 = icmp ult i64 %9, 4000000
br i1 %10, label %1, label %11
11: ; preds = %1
%12 = tail call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i64 %8)
ret i32 0
}