#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 */
struct sockaddr_nl {
  void *nl_groups;
  void *nl_pid;
  int /*<<< orphan*/ nl_family;
};

/* Variables and functions */
int /*<<< orphan*/ PF_NETLINK;
struct sockaddr_nl *malloc(int);
void *rand();
void gen_netlink(unsigned long *addr, unsigned long *addrlen) {
  struct sockaddr_nl *nl;
  nl = malloc(sizeof(struct sockaddr_nl));
  if (nl == NULL)
    return;
  nl->nl_family = PF_NETLINK;
  nl->nl_pid = rand();
  nl->nl_groups = rand();
  *addr = (unsigned long)nl;
  *addrlen = sizeof(struct sockaddr_nl);
}


x86 assembly (clang, -O0):
<gen_netlink>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    $0x18,%edi
call   1030 <malloc@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    114e <gen_netlink+0x2e>
jmp    1197 <gen_netlink+0x77>
mov    0x2e8b(%rip),%rax
mov    (%rax),%ecx
mov    -0x18(%rbp),%rax
mov    %ecx,0x10(%rax)
mov    $0x0,%al
call   1040 <rand@plt>
mov    %rax,%rcx
mov    -0x18(%rbp),%rax
mov    %rcx,0x8(%rax)
mov    $0x0,%al
call   1040 <rand@plt>
mov    %rax,%rcx
mov    -0x18(%rbp),%rax
mov    %rcx,(%rax)
mov    -0x18(%rbp),%rcx
mov    -0x8(%rbp),%rax
mov    %rcx,(%rax)
mov    -0x10(%rbp),%rax
movq   $0x18,(%rax)
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<gen_netlink>:
push   %r15
push   %r14
push   %rbx
mov    %rsi,%r14
mov    %rdi,%r15
mov    $0x18,%edi
call   1030 <malloc@plt>
test   %rax,%rax
je     1168 <gen_netlink+0x48>
mov    %rax,%rbx
mov    0x2e9c(%rip),%rax
mov    (%rax),%eax
mov    %eax,0x10(%rbx)
xor    %eax,%eax
call   1040 <rand@plt>
mov    %rax,0x8(%rbx)
xor    %eax,%eax
call   1040 <rand@plt>
mov    %rax,(%rbx)
mov    %rbx,(%r15)
movq   $0x18,(%r14)
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
%struct.sockaddr_nl = type { i8*, i8*, i32 }
@PF_NETLINK = global i32 0
define void @gen_netlink(i64* %0, i64* %1) {
%3 = alloca i64*
%4 = alloca i64*
%5 = alloca %struct.sockaddr_nl*
store i64* %0, i64** %3
store i64* %1, i64** %4
%6 = call %struct.sockaddr_nl* @malloc(i32 24)
store %struct.sockaddr_nl* %6, %struct.sockaddr_nl** %5
%7 = load %struct.sockaddr_nl*, %struct.sockaddr_nl** %5
%8 = icmp eq %struct.sockaddr_nl* %7, null
br i1 %8, label %9, label %10
9: ; preds = %2
br label %24
10: ; preds = %2
%11 = load i32, i32* @PF_NETLINK
%12 = load %struct.sockaddr_nl*, %struct.sockaddr_nl** %5
%13 = getelementptr inbounds %struct.sockaddr_nl, %struct.sockaddr_nl* %12, i32 0, i32 2
store i32 %11, i32* %13
%14 = call i8* (...) @rand()
%15 = load %struct.sockaddr_nl*, %struct.sockaddr_nl** %5
%16 = getelementptr inbounds %struct.sockaddr_nl, %struct.sockaddr_nl* %15, i32 0, i32 1
store i8* %14, i8** %16
%17 = call i8* (...) @rand()
%18 = load %struct.sockaddr_nl*, %struct.sockaddr_nl** %5
%19 = getelementptr inbounds %struct.sockaddr_nl, %struct.sockaddr_nl* %18, i32 0, i32 0
store i8* %17, i8** %19
%20 = load %struct.sockaddr_nl*, %struct.sockaddr_nl** %5
%21 = ptrtoint %struct.sockaddr_nl* %20 to i64
%22 = load i64*, i64** %3
store i64 %21, i64* %22
%23 = load i64*, i64** %4
store i64 24, i64* %23
br label %24
24: ; preds = %10, %9
ret void
}

LLVM IR (-O2):
%struct.sockaddr_nl = type { i8*, i8*, i32 }
@PF_NETLINK = global i32 0
define void @gen_netlink(i64* nocapture writeonly %0, i64* nocapture writeonly %1) {
%3 = tail call %struct.sockaddr_nl* @malloc(i32 24)
%4 = icmp eq %struct.sockaddr_nl* %3, null
br i1 %4, label %13, label %5
5: ; preds = %2
%6 = load i32, i32* @PF_NETLINK
%7 = getelementptr inbounds %struct.sockaddr_nl, %struct.sockaddr_nl* %3, i64 0, i32 2
store i32 %6, i32* %7
%8 = tail call i8* (...) @rand()
%9 = getelementptr inbounds %struct.sockaddr_nl, %struct.sockaddr_nl* %3, i64 0, i32 1
store i8* %8, i8** %9
%10 = tail call i8* (...) @rand()
%11 = getelementptr inbounds %struct.sockaddr_nl, %struct.sockaddr_nl* %3, i64 0, i32 0
store i8* %10, i8** %11
%12 = ptrtoint %struct.sockaddr_nl* %3 to i64
store i64 %12, i64* %0
store i64 24, i64* %1
br label %13
13: ; preds = %2, %5
ret void
}