#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 errno;
int link(char *, char *);
int /*<<< orphan*/ printf(char *, ...);
int main(int argc, char **argv) {
  if (argc < 3) {
    printf("ln: missing operand\n");
    return -1;
  }
  int r = link(argv[1], argv[2]);
  if (r < 0) {
    printf("ln error: %d\n", errno);
    return -errno;
  }
  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)
jge    115a <main+0x3a>
lea    0xeb9(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0xffffffff,-0x4(%rbp)
jmp    11ad <main+0x8d>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
mov    -0x10(%rbp),%rax
mov    0x10(%rax),%rsi
call   1040 <link@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
jge    11a6 <main+0x86>
mov    0x2e5d(%rip),%rax
mov    (%rax),%esi
lea    0xe89(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
mov    0x2e44(%rip),%rcx
sub    (%rcx),%eax
mov    %eax,-0x4(%rbp)
jmp    11ad <main+0x8d>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
cmp    $0x2,%edi
jg     114c <main+0x1c>
lea    0xece(%rip),%rdi
call   1030 <puts@plt>
mov    $0xffffffff,%ebx
jmp    117c <main+0x4c>
mov    0x8(%rsi),%rdi
mov    0x10(%rsi),%rsi
call   1050 <link@plt>
xor    %ebx,%ebx
test   %eax,%eax
jns    117c <main+0x4c>
mov    0x2e7a(%rip),%r14
mov    (%r14),%esi
lea    0xe90(%rip),%rdi
xor    %ebx,%ebx
xor    %eax,%eax
call   1040 <printf@plt>
sub    (%r14),%ebx
mov    %ebx,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [21 x i8] c"ln: missing operand\0A\00"
@.str.1 = [14 x i8] c"ln error: %d\0A\00"
@errno = global i32 0
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 slt i32 %7, 3
br i1 %8, label %9, label %11
9: ; preds = %2
%10 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0))
store i32 -1, i32* %3
br label %27
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 i32 @link(i8* %14, i8* %17)
store i32 %18, i32* %6
%19 = load i32, i32* %6
%20 = icmp slt i32 %19, 0
br i1 %20, label %21, label %26
21: ; preds = %11
%22 = load i32, i32* @errno
%23 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i32 %22)
%24 = load i32, i32* @errno
%25 = sub nsw i32 0, %24
store i32 %25, i32* %3
br label %27
26: ; preds = %11
store i32 0, i32* %3
br label %27
27: ; preds = %26, %21, %9
%28 = load i32, i32* %3
ret i32 %28
}

LLVM IR (-O2):
@.str.1 = [14 x i8] c"ln error: %d\0A\00"
@errno = global i32 0
@str = [20 x i8] c"ln: missing operand\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp slt i32 %0, 3
br i1 %3, label %4, label %6
4: ; preds = %2
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([20 x i8], [20 x i8]* @str, i64 0, i64 0))
br label %18
6: ; preds = %2
%7 = getelementptr inbounds i8*, i8** %1, i64 1
%8 = load i8*, i8** %7
%9 = getelementptr inbounds i8*, i8** %1, i64 2
%10 = load i8*, i8** %9
%11 = tail call i32 @link(i8* %8, i8* %10)
%12 = icmp slt i32 %11, 0
br i1 %12, label %13, label %18
13: ; preds = %6
%14 = load i32, i32* @errno
%15 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i32 %14)
%16 = load i32, i32* @errno
%17 = sub nsw i32 0, %16
br label %18
18: ; preds = %13, %6, %4
%19 = phi i32 [ -1, %4 ], [ %17, %13 ], [ 0, %6 ]
ret i32 %19
}