#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);
int main(int argc, const char *argv[]) {
  int prev = 1;
  int fib = 2;
  int temp;
  int sum = 0;
  while (fib < 4000000) {
    if (fib % 2 == 0) {
      sum += fib;
    }
    temp = fib;
    fib += prev;
    prev = temp;
  }
  printf("%d\n", sum);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
movl   $0x1,-0x14(%rbp)
movl   $0x2,-0x18(%rbp)
movl   $0x0,-0x20(%rbp)
cmpl   $0x3d0900,-0x18(%rbp)
jge    117f <main+0x6f>
mov    -0x18(%rbp),%eax
mov    $0x2,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    1165 <main+0x55>
mov    -0x18(%rbp),%eax
add    -0x20(%rbp),%eax
mov    %eax,-0x20(%rbp)
mov    -0x18(%rbp),%eax
mov    %eax,-0x1c(%rbp)
mov    -0x14(%rbp),%eax
add    -0x18(%rbp),%eax
mov    %eax,-0x18(%rbp)
mov    -0x1c(%rbp),%eax
mov    %eax,-0x14(%rbp)
jmp    113b <main+0x2b>
mov    -0x20(%rbp),%esi
lea    0xe77(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

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

LLVM IR (-O0):
@.str = [4 x i8] c"%d\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i32
%8 = alloca i32
%9 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
store i32 1, i32* %6
store i32 2, i32* %7
store i32 0, i32* %9
br label %10
10: ; preds = %21, %2
%11 = load i32, i32* %7
%12 = icmp slt i32 %11, 4000000
br i1 %12, label %13, label %27
13: ; preds = %10
%14 = load i32, i32* %7
%15 = srem i32 %14, 2
%16 = icmp eq i32 %15, 0
br i1 %16, label %17, label %21
17: ; preds = %13
%18 = load i32, i32* %7
%19 = load i32, i32* %9
%20 = add nsw i32 %19, %18
store i32 %20, i32* %9
br label %21
21: ; preds = %17, %13
%22 = load i32, i32* %7
store i32 %22, i32* %8
%23 = load i32, i32* %6
%24 = load i32, i32* %7
%25 = add nsw i32 %24, %23
store i32 %25, i32* %7
%26 = load i32, i32* %8
store i32 %26, i32* %6
br label %10
27: ; preds = %10
%28 = load i32, i32* %9
%29 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %28)
ret i32 0
}

LLVM IR (-O2):
@.str = [4 x i8] c"%d\0A\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
br label %3
3: ; preds = %2, %3
%4 = phi i32 [ 0, %2 ], [ %10, %3 ]
%5 = phi i32 [ 1, %2 ], [ %6, %3 ]
%6 = phi i32 [ 2, %2 ], [ %11, %3 ]
%7 = and i32 %6, 1
%8 = icmp eq i32 %7, 0
%9 = select i1 %8, i32 %6, i32 0
%10 = add nsw i32 %9, %4
%11 = add nsw i32 %5, %6
%12 = icmp slt i32 %11, 4000000
br i1 %12, label %3, label %13
13: ; preds = %3
%14 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %10)
ret i32 0
}