#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 /*<<< orphan*/ s_addr;
};
struct sockaddr_in {
  int /*<<< orphan*/ sin_port;
  TYPE_1__ sin_addr;
  int /*<<< orphan*/ sin_family;
};
struct sockaddr {
  int dummy;
};
typedef int /*<<< orphan*/ serv_addr;

/* Variables and functions */
int /*<<< orphan*/ AF_INET;
int /*<<< orphan*/ INADDR_ANY;
int /*<<< orphan*/ SOCK_STREAM;
scalar_t__ bind(int, struct sockaddr *, int);
int /*<<< orphan*/ bzero(char *, int);
int /*<<< orphan*/ htons(int);
int /*<<< orphan*/ perror(char *);
int socket(int /*<<< orphan*/, int /*<<< orphan*/, int /*<<< orphan*/);
int create_server(int portno) {
  int sockfd = socket(AF_INET, SOCK_STREAM, 0);
  struct sockaddr_in serv_addr;
  if (sockfd < 0) {
    perror("ERROR opening socket");
    return -1;
  }
  bzero((char *)&serv_addr, sizeof(serv_addr));
  serv_addr.sin_family = AF_INET;
  serv_addr.sin_addr.s_addr = INADDR_ANY;
  serv_addr.sin_port = htons(portno);
  if (bind(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
    perror("ERROR on binding");
    return -1;
  }
  return sockfd;
}


x86 assembly (clang, -O0):
<create_server>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x8(%rbp)
mov    0x2e86(%rip),%rax
mov    (%rax),%edi
mov    0x2e65(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1070 <socket@plt>
mov    %eax,-0xc(%rbp)
cmpl   $0x0,-0xc(%rbp)
jge    1199 <create_server+0x49>
lea    0xe78(%rip),%rdi
call   1050 <perror@plt>
movl   $0xffffffff,-0x4(%rbp)
jmp    1203 <create_server+0xb3>
lea    -0x18(%rbp),%rdi
mov    $0xc,%esi
call   1060 <bzero@plt>
mov    0x2e3a(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x10(%rbp)
mov    0x2e26(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x14(%rbp)
mov    -0x8(%rbp),%edi
call   1030 <htons@plt>
mov    %eax,-0x18(%rbp)
mov    -0xc(%rbp),%edi
lea    -0x18(%rbp),%rsi
mov    $0xc,%edx
call   1040 <bind@plt>
cmp    $0x0,%rax
jge    11fd <create_server+0xad>
lea    0xe29(%rip),%rdi
call   1050 <perror@plt>
movl   $0xffffffff,-0x4(%rbp)
jmp    1203 <create_server+0xb3>
mov    -0xc(%rbp),%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<create_server>:
push   %rbp
push   %r15
push   %r14
push   %rbx
sub    $0x18,%rsp
mov    %edi,%ebp
mov    0x2e85(%rip),%r15
mov    (%r15),%edi
mov    0x2e63(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1070 <socket@plt>
test   %eax,%eax
js     11ce <create_server+0x7e>
mov    %eax,%ebx
lea    0x8(%rsp),%r14
mov    %r14,%rdi
mov    $0xc,%esi
call   1060 <bzero@plt>
mov    (%r15),%eax
mov    %eax,0x10(%rsp)
mov    0x2e44(%rip),%rax
mov    (%rax),%eax
mov    %eax,0xc(%rsp)
mov    %ebp,%edi
call   1030 <htons@plt>
mov    %eax,0x8(%rsp)
mov    %ebx,%edi
mov    %r14,%rsi
mov    $0xc,%edx
call   1040 <bind@plt>
test   %rax,%rax
js     11d7 <create_server+0x87>
mov    %ebx,%eax
add    $0x18,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret
lea    0xe2b(%rip),%rdi
jmp    11de <create_server+0x8e>
lea    0xe37(%rip),%rdi
call   1050 <perror@plt>
mov    $0xffffffff,%ebx
jmp    11c1 <create_server+0x71>

LLVM IR (-O0):
%struct.sockaddr_in = type { i32, %struct.TYPE_2__, i32 }
%struct.TYPE_2__ = type { i32 }
%struct.sockaddr = type { i32 }
@AF_INET = global i32 0
@SOCK_STREAM = global i32 0
@.str = [21 x i8] c"ERROR opening socket\00"
@INADDR_ANY = global i32 0
@.str.1 = [17 x i8] c"ERROR on binding\00"
define i32 @create_server(i32 %0) {
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
%5 = alloca %struct.sockaddr_in
store i32 %0, i32* %3
%6 = load i32, i32* @AF_INET
%7 = load i32, i32* @SOCK_STREAM
%8 = call i32 @socket(i32 %6, i32 %7, i32 0)
store i32 %8, i32* %4
%9 = load i32, i32* %4
%10 = icmp slt i32 %9, 0
br i1 %10, label %11, label %13
11: ; preds = %1
%12 = call i32 @perror(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0))
store i32 -1, i32* %2
br label %32
13: ; preds = %1
%14 = bitcast %struct.sockaddr_in* %5 to i8*
%15 = call i32 @bzero(i8* %14, i32 12)
%16 = load i32, i32* @AF_INET
%17 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %5, i32 0, i32 2
store i32 %16, i32* %17
%18 = load i32, i32* @INADDR_ANY
%19 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %5, i32 0, i32 1
%20 = getelementptr inbounds %struct.TYPE_2__, %struct.TYPE_2__* %19, i32 0, i32 0
store i32 %18, i32* %20
%21 = load i32, i32* %3
%22 = call i32 @htons(i32 %21)
%23 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %5, i32 0, i32 0
store i32 %22, i32* %23
%24 = load i32, i32* %4
%25 = bitcast %struct.sockaddr_in* %5 to %struct.sockaddr*
%26 = call i64 @bind(i32 %24, %struct.sockaddr* %25, i32 12)
%27 = icmp slt i64 %26, 0
br i1 %27, label %28, label %30
28: ; preds = %13
%29 = call i32 @perror(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.1, i64 0, i64 0))
store i32 -1, i32* %2
br label %32
30: ; preds = %13
%31 = load i32, i32* %4
store i32 %31, i32* %2
br label %32
32: ; preds = %30, %28, %11
%33 = load i32, i32* %2
ret i32 %33
}

LLVM IR (-O2):
%struct.sockaddr_in = type { i32, %struct.TYPE_2__, i32 }
%struct.TYPE_2__ = type { i32 }
%struct.sockaddr = type { i32 }
@AF_INET = global i32 0
@SOCK_STREAM = global i32 0
@.str = [21 x i8] c"ERROR opening socket\00"
@INADDR_ANY = global i32 0
@.str.1 = [17 x i8] c"ERROR on binding\00"
define i32 @create_server(i32 %0) {
%2 = alloca %struct.sockaddr_in
%3 = load i32, i32* @AF_INET
%4 = load i32, i32* @SOCK_STREAM
%5 = tail call i32 @socket(i32 %3, i32 %4, i32 0)
%6 = bitcast %struct.sockaddr_in* %2 to i8*
%7 = icmp slt i32 %5, 0
br i1 %7, label %8, label %10
8: ; preds = %1
%9 = tail call i32 @perror(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0))
br label %23
10: ; preds = %1
%11 = call i32 @bzero(i8* %6, i32 12)
%12 = load i32, i32* @AF_INET
%13 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %2, i64 0, i32 2
store i32 %12, i32* %13
%14 = load i32, i32* @INADDR_ANY
%15 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %2, i64 0, i32 1, i32 0
store i32 %14, i32* %15
%16 = tail call i32 @htons(i32 %0)
%17 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %2, i64 0, i32 0
store i32 %16, i32* %17
%18 = bitcast %struct.sockaddr_in* %2 to %struct.sockaddr*
%19 = call i64 @bind(i32 %5, %struct.sockaddr* %18, i32 12)
%20 = icmp slt i64 %19, 0
br i1 %20, label %21, label %23
21: ; preds = %10
%22 = call i32 @perror(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.1, i64 0, i64 0))
br label %23
23: ; preds = %10, %21, %8
%24 = phi i32 [ -1, %8 ], [ -1, %21 ], [ %5, %10 ]
ret i32 %24
}