#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[]) {
  if (argc != 3) {
    printf("Usage: ln old new\n");
    exit(1);
  }
  if (link(argv[1], argv[2]) < 0)
    printf("link %s %s: failed\n", argv[1], argv[2]);
  exit(1);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x3,-0x8(%rbp)
je     1168 <main+0x38>
lea    0xea9(%rip),%rdi
mov    $0x0,%al
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    11a5 <main+0x75>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rsi
mov    -0x10(%rbp),%rax
mov    0x10(%rax),%rdx
lea    0xe75(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    $0x1,%edi
call   1050 <exit@plt>

x86 assembly (clang, -O2):
<main>:
push   %rbx
cmp    $0x3,%edi
jne    117b <main+0x3b>
mov    %rsi,%rbx
mov    0x8(%rsi),%rdi
mov    0x10(%rsi),%rsi
call   1050 <link@plt>
test   %rax,%rax
jns    1171 <main+0x31>
mov    0x8(%rbx),%rsi
mov    0x10(%rbx),%rdx
lea    0xe96(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    $0x1,%edi
call   1060 <exit@plt>
lea    0xe92(%rip),%rdi
call   1030 <puts@plt>
mov    $0x1,%edi
call   1060 <exit@plt>

LLVM IR (-O0):
@.str = [19 x i8] c"Usage: ln old new\0A\00"
@.str.1 = [20 x i8] c"link %s %s: failed\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%6 = load i32, i32* %4
%7 = icmp ne i32 %6, 3
br i1 %7, label %8, label %11
8: ; preds = %2
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str, i64 0, i64 0))
%10 = call i32 @exit(i32 1)
unreachable
11: ; preds = %2
%12 = load i8**, i8*** %5
%13 = getelementptr inbounds i8*, i8** %12, i64 1
%14 = load i8*, i8** %13
%15 = load i8**, i8*** %5
%16 = getelementptr inbounds i8*, i8** %15, i64 2
%17 = load i8*, i8** %16
%18 = call i64 @link(i8* %14, i8* %17)
%19 = icmp slt i64 %18, 0
br i1 %19, label %20, label %28
20: ; preds = %11
%21 = load i8**, i8*** %5
%22 = getelementptr inbounds i8*, i8** %21, i64 1
%23 = load i8*, i8** %22
%24 = load i8**, i8*** %5
%25 = getelementptr inbounds i8*, i8** %24, i64 2
%26 = load i8*, i8** %25
%27 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0), i8* %23, i8* %26)
br label %28
28: ; preds = %20, %11
%29 = call i32 @exit(i32 1)
unreachable
}

LLVM IR (-O2):
@.str.1 = [20 x i8] c"link %s %s: failed\0A\00"
@str = [18 x i8] c"Usage: ln old new\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 ([18 x i8], [18 x i8]* @str, 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 %18
14: ; preds = %7
%15 = load i8*, i8** %8
%16 = load i8*, i8** %10
%17 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0), i8* %15, i8* %16)
br label %18
18: ; preds = %14, %7
%19 = tail call i32 @exit(i32 1)
unreachable
}