#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 fibone = 1;
  int fibtwo = 2;
  int sum = 0;
  while (fibtwo < 4000000) {
    if (fibtwo % 2 == 0) {
      sum = sum + fibtwo;
    }
    fibtwo = fibone + fibtwo;
    fibone = fibtwo - fibone;
  }
  printf("sum: %d\n", sum);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x1,-0x8(%rbp)
movl   $0x2,-0xc(%rbp)
movl   $0x0,-0x10(%rbp)
cmpl   $0x3d0900,-0xc(%rbp)
jge    1175 <main+0x65>
mov    -0xc(%rbp),%eax
mov    $0x2,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    115e <main+0x4e>
mov    -0x10(%rbp),%eax
add    -0xc(%rbp),%eax
mov    %eax,-0x10(%rbp)
mov    -0x8(%rbp),%eax
add    -0xc(%rbp),%eax
mov    %eax,-0xc(%rbp)
mov    -0xc(%rbp),%eax
sub    -0x8(%rbp),%eax
mov    %eax,-0x8(%rbp)
jmp    1134 <main+0x24>
mov    -0x10(%rbp),%esi
lea    0xe81(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

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

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

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