#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*/ SYS_pivot_root;
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char const *);
int /*<<< orphan*/ perror(char *);
int /*<<< orphan*/ stderr;
scalar_t__ syscall(int /*<<< orphan*/, char const *, char const *);
int main(int argc, const char **argv) {
  if (argc != 3) {
    fprintf(stderr, "usage: %s new_root put_old\n", argv[0]);
    return 1;
  }
  if (syscall(SYS_pivot_root, argv[1], argv[2]) < 0) {
    perror("pivot_root");
    return 1;
  }
  return 0;
}


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     1178 <main+0x48>
mov    0x2e89(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe99(%rip),%rsi
call   1030 <fprintf@plt>
movl   $0x1,-0x4(%rbp)
jmp    11bf <main+0x8f>
mov    0x2e59(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rsi
mov    -0x10(%rbp),%rax
mov    0x10(%rax),%rdx
call   1040 <syscall@plt>
cmp    $0x0,%rax
jge    11b8 <main+0x88>
lea    0xe75(%rip),%rdi
call   1050 <perror@plt>
movl   $0x1,-0x4(%rbp)
jmp    11bf <main+0x8f>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
cmp    $0x3,%edi
jne    115b <main+0x2b>
mov    0x2e9b(%rip),%rax
mov    (%rax),%edi
mov    0x8(%rsi),%rax
mov    0x10(%rsi),%rdx
mov    %rax,%rsi
call   1040 <syscall@plt>
mov    %rax,%rcx
xor    %eax,%eax
test   %rcx,%rcx
js     117a <main+0x4a>
pop    %rcx
ret
mov    0x2e7e(%rip),%rax
mov    (%rax),%edi
mov    (%rsi),%rdx
lea    0xe92(%rip),%rsi
call   1030 <fprintf@plt>
mov    $0x1,%eax
pop    %rcx
ret
lea    0xe9b(%rip),%rdi
call   1050 <perror@plt>
jmp    1173 <main+0x43>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [28 x i8] c"usage: %s new_root put_old\0A\00"
@SYS_pivot_root = global i32 0
@.str.1 = [11 x i8] c"pivot_root\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 %14
8: ; preds = %2
%9 = load i32, i32* @stderr
%10 = load i8**, i8*** %5
%11 = getelementptr inbounds i8*, i8** %10, i64 0
%12 = load i8*, i8** %11
%13 = call i32 @fprintf(i32 %9, i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str, i64 0, i64 0), i8* %12)
store i32 1, i32* %3
br label %27
14: ; preds = %2
%15 = load i32, i32* @SYS_pivot_root
%16 = load i8**, i8*** %5
%17 = getelementptr inbounds i8*, i8** %16, i64 1
%18 = load i8*, i8** %17
%19 = load i8**, i8*** %5
%20 = getelementptr inbounds i8*, i8** %19, i64 2
%21 = load i8*, i8** %20
%22 = call i64 @syscall(i32 %15, i8* %18, i8* %21)
%23 = icmp slt i64 %22, 0
br i1 %23, label %24, label %26
24: ; preds = %14
%25 = call i32 @perror(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0))
store i32 1, i32* %3
br label %27
26: ; preds = %14
store i32 0, i32* %3
br label %27
27: ; preds = %26, %24, %8
%28 = load i32, i32* %3
ret i32 %28
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [28 x i8] c"usage: %s new_root put_old\0A\00"
@SYS_pivot_root = global i32 0
@.str.1 = [11 x i8] c"pivot_root\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 3
br i1 %3, label %8, label %4
4: ; preds = %2
%5 = load i32, i32* @stderr
%6 = load i8*, i8** %1
%7 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str, i64 0, i64 0), i8* %6)
br label %18
8: ; preds = %2
%9 = load i32, i32* @SYS_pivot_root
%10 = getelementptr inbounds i8*, i8** %1, i64 1
%11 = load i8*, i8** %10
%12 = getelementptr inbounds i8*, i8** %1, i64 2
%13 = load i8*, i8** %12
%14 = tail call i64 @syscall(i32 %9, i8* %11, i8* %13)
%15 = icmp slt i64 %14, 0
br i1 %15, label %16, label %18
16: ; preds = %8
%17 = tail call i32 @perror(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0))
br label %18
18: ; preds = %8, %16, %4
%19 = phi i32 [ 1, %4 ], [ 1, %16 ], [ 0, %8 ]
ret i32 %19
}