#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 */
typedef struct TYPE_2__ TYPE_1__;

/* Type definitions */
struct TYPE_2__ {
  int fd;
};
struct epoll_event {
  int events;
  TYPE_1__ data;
};

/* Variables and functions */
int EPOLLET;
int EPOLLIN;
int /*<<< orphan*/ EPOLL_CTL_ADD;
scalar_t__ epoll_ctl(int, int /*<<< orphan*/, int, struct epoll_event *);
int /*<<< orphan*/ perror(char *);
int add_fd_to_epoll(int efd, int fd) {
  struct epoll_event event;
  event.data.fd = fd;
  event.events = EPOLLIN | EPOLLET;
  if (epoll_ctl(efd, EPOLL_CTL_ADD, fd, &event) < 0) {
    perror("epoll_ctl");
    return -1;
  }
  return 0;
}


x86 assembly (clang, -O0):
<add_fd_to_epoll>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x8(%rbp)
mov    %esi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
mov    %eax,-0x14(%rbp)
mov    0x2ead(%rip),%rax
mov    (%rax),%eax
mov    0x2e8c(%rip),%rcx
or     (%rcx),%eax
mov    %eax,-0x18(%rbp)
mov    -0x8(%rbp),%edi
mov    0x2e8d(%rip),%rax
mov    (%rax),%esi
mov    -0xc(%rbp),%edx
lea    -0x18(%rbp),%rcx
call   1030 <epoll_ctl@plt>
cmp    $0x0,%rax
jge    1183 <add_fd_to_epoll+0x63>
lea    0xe8e(%rip),%rdi
call   1040 <perror@plt>
movl   $0xffffffff,-0x4(%rbp)
jmp    118a <add_fd_to_epoll+0x6a>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<add_fd_to_epoll>:
push   %rax
mov    %esi,%edx
mov    0x2ebe(%rip),%rax
mov    0x2e9f(%rip),%rcx
mov    (%rcx),%ecx
or     (%rax),%ecx
mov    %esi,0x4(%rsp)
mov    %ecx,(%rsp)
mov    0x2e9d(%rip),%rax
mov    (%rax),%esi
mov    %rsp,%rcx
call   1030 <epoll_ctl@plt>
mov    %rax,%rcx
xor    %eax,%eax
test   %rcx,%rcx
js     1159 <add_fd_to_epoll+0x39>
pop    %rcx
ret
lea    0xea0(%rip),%rdi
call   1040 <perror@plt>
mov    $0xffffffff,%eax
pop    %rcx
ret

LLVM IR (-O0):
%struct.epoll_event = type { i32, %struct.TYPE_2__ }
%struct.TYPE_2__ = type { i32 }
@EPOLLIN = global i32 0
@EPOLLET = global i32 0
@EPOLL_CTL_ADD = global i32 0
@.str = [10 x i8] c"epoll_ctl\00"
define i32 @add_fd_to_epoll(i32 %0, i32 %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
%6 = alloca %struct.epoll_event
store i32 %0, i32* %4
store i32 %1, i32* %5
%7 = load i32, i32* %5
%8 = getelementptr inbounds %struct.epoll_event, %struct.epoll_event* %6, i32 0, i32 1
%9 = getelementptr inbounds %struct.TYPE_2__, %struct.TYPE_2__* %8, i32 0, i32 0
store i32 %7, i32* %9
%10 = load i32, i32* @EPOLLIN
%11 = load i32, i32* @EPOLLET
%12 = or i32 %10, %11
%13 = getelementptr inbounds %struct.epoll_event, %struct.epoll_event* %6, i32 0, i32 0
store i32 %12, i32* %13
%14 = load i32, i32* %4
%15 = load i32, i32* @EPOLL_CTL_ADD
%16 = load i32, i32* %5
%17 = call i64 @epoll_ctl(i32 %14, i32 %15, i32 %16, %struct.epoll_event* %6)
%18 = icmp slt i64 %17, 0
br i1 %18, label %19, label %21
19: ; preds = %2
%20 = call i32 @perror(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0))
store i32 -1, i32* %3
br label %22
21: ; preds = %2
store i32 0, i32* %3
br label %22
22: ; preds = %21, %19
%23 = load i32, i32* %3
ret i32 %23
}

LLVM IR (-O2):
%struct.epoll_event = type { i32, %struct.TYPE_2__ }
%struct.TYPE_2__ = type { i32 }
@EPOLLIN = global i32 0
@EPOLLET = global i32 0
@EPOLL_CTL_ADD = global i32 0
@.str = [10 x i8] c"epoll_ctl\00"
define i32 @add_fd_to_epoll(i32 %0, i32 %1) {
%3 = alloca %struct.epoll_event
%4 = bitcast %struct.epoll_event* %3 to i8*
%5 = getelementptr inbounds %struct.epoll_event, %struct.epoll_event* %3, i64 0, i32 1, i32 0
store i32 %1, i32* %5
%6 = load i32, i32* @EPOLLIN
%7 = load i32, i32* @EPOLLET
%8 = or i32 %7, %6
%9 = getelementptr inbounds %struct.epoll_event, %struct.epoll_event* %3, i64 0, i32 0
store i32 %8, i32* %9
%10 = load i32, i32* @EPOLL_CTL_ADD
%11 = call i64 @epoll_ctl(i32 %0, i32 %10, i32 %1, %struct.epoll_event* %3)
%12 = icmp slt i64 %11, 0
br i1 %12, label %13, label %15
13: ; preds = %2
%14 = call i32 @perror(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0))
br label %15
15: ; preds = %2, %13
%16 = phi i32 [ -1, %13 ], [ 0, %2 ]
ret i32 %16
}