#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*/ exit(int);
scalar_t__ link(char *, char *);
int /*<<< orphan*/ printf(char *);
int main(int argc, char **argv) {
  int fd;
  if (argc != 3) {
    printf("usage: link_1 existfile newfile\n");
    exit(1);
  }
  if (link(argv[1], argv[2]) < 0) {
    printf("link call error\n");
    exit(2);
  }
  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)
cmpl   $0x3,-0x8(%rbp)
je     1166 <main+0x36>
lea    0xea9(%rip),%rdi
call   1030 <printf@plt>
mov    $0x1,%edi
call   1050 <exit@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
mov    -0x10(%rbp),%rax
mov    0x10(%rax),%rsi
call   1040 <link@plt>
cmp    $0x0,%rax
jge    119b <main+0x6b>
lea    0xe95(%rip),%rdi
call   1030 <printf@plt>
mov    $0x2,%edi
call   1050 <exit@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
cmp    $0x3,%edi
jne    114c <main+0x1c>
mov    0x8(%rsi),%rdi
mov    0x10(%rsi),%rsi
call   1040 <link@plt>
test   %rax,%rax
js     1162 <main+0x32>
xor    %eax,%eax
pop    %rcx
ret
lea    0xebd(%rip),%rdi
call   1030 <puts@plt>
mov    $0x1,%edi
call   1050 <exit@plt>
lea    0xe97(%rip),%rdi
call   1030 <puts@plt>
mov    $0x2,%edi
call   1050 <exit@plt>

LLVM IR (-O0):
@.str = [33 x i8] c"usage: link_1 existfile newfile\0A\00"
@.str.1 = [17 x i8] c"link call error\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%7 = load i32, i32* %4
%8 = icmp ne i32 %7, 3
br i1 %8, label %9, label %12
9: ; preds = %2
%10 = call i32 @printf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @.str, i64 0, i64 0))
%11 = call i32 @exit(i32 1)
unreachable
12: ; preds = %2
%13 = load i8**, i8*** %5
%14 = getelementptr inbounds i8*, i8** %13, i64 1
%15 = load i8*, i8** %14
%16 = load i8**, i8*** %5
%17 = getelementptr inbounds i8*, i8** %16, i64 2
%18 = load i8*, i8** %17
%19 = call i64 @link(i8* %15, i8* %18)
%20 = icmp slt i64 %19, 0
br i1 %20, label %21, label %24
21: ; preds = %12
%22 = call i32 @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.1, i64 0, i64 0))
%23 = call i32 @exit(i32 2)
unreachable
24: ; preds = %12
ret i32 0
}

LLVM IR (-O2):
@str = [16 x i8] c"link call error\00"
@str.2 = [32 x i8] c"usage: link_1 existfile newfile\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 3
br i1 %3, label %7, label %4
4: ; preds = %2
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([32 x i8], [32 x i8]* @str.2, i64 0, i64 0))
%6 = tail call i32 @exit(i32 1)
unreachable
7: ; preds = %2
%8 = getelementptr inbounds i8*, i8** %1, i64 1
%9 = load i8*, i8** %8
%10 = getelementptr inbounds i8*, i8** %1, i64 2
%11 = load i8*, i8** %10
%12 = tail call i64 @link(i8* %9, i8* %11)
%13 = icmp slt i64 %12, 0
br i1 %13, label %14, label %17
14: ; preds = %7
%15 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 x i8]* @str, i64 0, i64 0))
%16 = tail call i32 @exit(i32 2)
unreachable
17: ; preds = %7
ret i32 0
}