#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, char **argv) {
  int n;
  int s = 2;
  int p[2] = {1, 2};
  while (1) {
    n = p[0] + p[1];
    if (n > 4000000)
      break;
    if (n % 2 == 0)
      s += n;
    p[0] = p[1];
    p[1] = n;
  }
  printf("%d\n", s);
  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   $0x2,-0x18(%rbp)
mov    0xecc(%rip),%rax
mov    %rax,-0x20(%rbp)
mov    -0x20(%rbp),%eax
add    -0x1c(%rbp),%eax
mov    %eax,-0x14(%rbp)
cmpl   $0x3d0900,-0x14(%rbp)
jle    1153 <main+0x43>
jmp    1181 <main+0x71>
mov    -0x14(%rbp),%eax
mov    $0x2,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    1170 <main+0x60>
mov    -0x14(%rbp),%eax
add    -0x18(%rbp),%eax
mov    %eax,-0x18(%rbp)
mov    -0x1c(%rbp),%eax
mov    %eax,-0x20(%rbp)
mov    -0x14(%rbp),%eax
mov    %eax,-0x1c(%rbp)
jmp    1138 <main+0x28>
mov    -0x18(%rbp),%esi
lea    0xe7d(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
mov    $0x2,%eax
mov    $0x3,%ecx
mov    $0x2,%esi
nop
mov    %ecx,%edx
test   $0x1,%dl
mov    $0x0,%ecx
cmove  %edx,%ecx
add    %ecx,%esi
add    %edx,%eax
mov    %eax,%ecx
cmp    $0x3d0901,%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):
@__const.main.p = [2 x i32] [i32 1, i32 2]
@.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 [2 x i32]
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
store i32 2, i32* %7
%9 = bitcast [2 x i32]* %8 to i8*
br label %10
10: ; preds = %2, %27
%11 = getelementptr inbounds [2 x i32], [2 x i32]* %8, i64 0, i64 0
%12 = load i32, i32* %11
%13 = getelementptr inbounds [2 x i32], [2 x i32]* %8, i64 0, i64 1
%14 = load i32, i32* %13
%15 = add nsw i32 %12, %14
store i32 %15, i32* %6
%16 = load i32, i32* %6
%17 = icmp sgt i32 %16, 4000000
br i1 %17, label %18, label %19
18: ; preds = %10
br label %33
19: ; preds = %10
%20 = load i32, i32* %6
%21 = srem i32 %20, 2
%22 = icmp eq i32 %21, 0
br i1 %22, label %23, label %27
23: ; preds = %19
%24 = load i32, i32* %6
%25 = load i32, i32* %7
%26 = add nsw i32 %25, %24
store i32 %26, i32* %7
br label %27
27: ; preds = %23, %19
%28 = getelementptr inbounds [2 x i32], [2 x i32]* %8, i64 0, i64 1
%29 = load i32, i32* %28
%30 = getelementptr inbounds [2 x i32], [2 x i32]* %8, i64 0, i64 0
store i32 %29, i32* %30
%31 = load i32, i32* %6
%32 = getelementptr inbounds [2 x i32], [2 x i32]* %8, i64 0, i64 1
store i32 %31, i32* %32
br label %10
33: ; preds = %18
%34 = load i32, i32* %7
%35 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %34)
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 [ 3, %2 ], [ %11, %3 ]
%5 = phi i32 [ 2, %2 ], [ %4, %3 ]
%6 = phi i32 [ 2, %2 ], [ %10, %3 ]
%7 = and i32 %4, 1
%8 = icmp eq i32 %7, 0
%9 = select i1 %8, i32 %4, i32 0
%10 = add nsw i32 %9, %6
%11 = add nsw i32 %5, %4
%12 = icmp sgt i32 %11, 4000000
br i1 %12, label %13, label %3
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
}