#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 to_int(char const *);
scalar_t__ verify_u13(char const *);
scalar_t__ verify_u16(char const *);
scalar_t__ verify_u3(char const *);
scalar_t__ verify_u32(char const *);
scalar_t__ verify_u4(char const *);
scalar_t__ verify_u8(char const *);
int verify_ip_version(const char *buffer) {
  return ((verify_u3(buffer) || verify_u4(buffer) || verify_u8(buffer) ||
           verify_u13(buffer) || verify_u16(buffer) || verify_u32(buffer)) &&
          to_int(buffer) == 4);
}


x86 assembly (clang, -O0):
<verify_ip_version>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rdi
call   1030 <verify_u3@plt>
cmp    $0x0,%rax
jne    11f6 <verify_ip_version+0x86>
mov    -0x8(%rbp),%rdi
call   1070 <verify_u4@plt>
cmp    $0x0,%rax
jne    11f6 <verify_ip_version+0x86>
mov    -0x8(%rbp),%rdi
call   1080 <verify_u8@plt>
cmp    $0x0,%rax
jne    11f6 <verify_ip_version+0x86>
mov    -0x8(%rbp),%rdi
call   1090 <verify_u13@plt>
cmp    $0x0,%rax
jne    11f6 <verify_ip_version+0x86>
mov    -0x8(%rbp),%rdi
call   1040 <verify_u16@plt>
cmp    $0x0,%rax
jne    11f6 <verify_ip_version+0x86>
mov    -0x8(%rbp),%rdi
call   1060 <verify_u32@plt>
mov    %rax,%rcx
xor    %eax,%eax
cmp    $0x0,%rcx
mov    %al,-0x9(%rbp)
je     1208 <verify_ip_version+0x98>
mov    -0x8(%rbp),%rdi
call   1050 <to_int@plt>
cmp    $0x4,%eax
sete   %al
mov    %al,-0x9(%rbp)
mov    -0x9(%rbp),%al
and    $0x1,%al
movzbl %al,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<verify_ip_version>:
push   %rbx
mov    %rdi,%rbx
call   1030 <verify_u3@plt>
test   %rax,%rax
jne    11bf <verify_ip_version+0x4f>
mov    %rbx,%rdi
call   1070 <verify_u4@plt>
test   %rax,%rax
jne    11bf <verify_ip_version+0x4f>
mov    %rbx,%rdi
call   1080 <verify_u8@plt>
test   %rax,%rax
jne    11bf <verify_ip_version+0x4f>
mov    %rbx,%rdi
call   1090 <verify_u13@plt>
test   %rax,%rax
jne    11bf <verify_ip_version+0x4f>
mov    %rbx,%rdi
call   1040 <verify_u16@plt>
test   %rax,%rax
jne    11bf <verify_ip_version+0x4f>
mov    %rbx,%rdi
call   1060 <verify_u32@plt>
test   %rax,%rax
je     11d3 <verify_ip_version+0x63>
mov    %rbx,%rdi
call   1050 <to_int@plt>
mov    %eax,%ecx
xor    %eax,%eax
cmp    $0x4,%ecx
sete   %al
pop    %rbx
ret
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
define i32 @verify_ip_version(i8* %0) {
%2 = alloca i8*
store i8* %0, i8** %2
%3 = load i8*, i8** %2
%4 = call i64 @verify_u3(i8* %3)
%5 = icmp ne i64 %4, 0
br i1 %5, label %26, label %6
6: ; preds = %1
%7 = load i8*, i8** %2
%8 = call i64 @verify_u4(i8* %7)
%9 = icmp ne i64 %8, 0
br i1 %9, label %26, label %10
10: ; preds = %6
%11 = load i8*, i8** %2
%12 = call i64 @verify_u8(i8* %11)
%13 = icmp ne i64 %12, 0
br i1 %13, label %26, label %14
14: ; preds = %10
%15 = load i8*, i8** %2
%16 = call i64 @verify_u13(i8* %15)
%17 = icmp ne i64 %16, 0
br i1 %17, label %26, label %18
18: ; preds = %14
%19 = load i8*, i8** %2
%20 = call i64 @verify_u16(i8* %19)
%21 = icmp ne i64 %20, 0
br i1 %21, label %26, label %22
22: ; preds = %18
%23 = load i8*, i8** %2
%24 = call i64 @verify_u32(i8* %23)
%25 = icmp ne i64 %24, 0
br i1 %25, label %26, label %30
26: ; preds = %22, %18, %14, %10, %6, %1
%27 = load i8*, i8** %2
%28 = call i32 @to_int(i8* %27)
%29 = icmp eq i32 %28, 4
br label %30
30: ; preds = %26, %22
%31 = phi i1 [ false, %22 ], [ %29, %26 ]
%32 = zext i1 %31 to i32
ret i32 %32
}

LLVM IR (-O2):
define i32 @verify_ip_version(i8* %0) {
%2 = tail call i64 @verify_u3(i8* %0)
%3 = icmp eq i64 %2, 0
br i1 %3, label %4, label %19
4: ; preds = %1
%5 = tail call i64 @verify_u4(i8* %0)
%6 = icmp eq i64 %5, 0
br i1 %6, label %7, label %19
7: ; preds = %4
%8 = tail call i64 @verify_u8(i8* %0)
%9 = icmp eq i64 %8, 0
br i1 %9, label %10, label %19
10: ; preds = %7
%11 = tail call i64 @verify_u13(i8* %0)
%12 = icmp eq i64 %11, 0
br i1 %12, label %13, label %19
13: ; preds = %10
%14 = tail call i64 @verify_u16(i8* %0)
%15 = icmp eq i64 %14, 0
br i1 %15, label %16, label %19
16: ; preds = %13
%17 = tail call i64 @verify_u32(i8* %0)
%18 = icmp eq i64 %17, 0
br i1 %18, label %23, label %19
19: ; preds = %16, %13, %10, %7, %4, %1
%20 = tail call i32 @to_int(i8* %0)
%21 = icmp eq i32 %20, 4
%22 = zext i1 %21 to i32
br label %23
23: ; preds = %19, %16
%24 = phi i32 [ 0, %16 ], [ %22, %19 ]
ret i32 %24
}