#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 */
#define EEXIST 132
#define EINVAL 131
#define ENODATA 130
#define ENOTTY 129
#define EOPNOTSUPP 128
char const *strerror(int);
const char *policy_error(int errno_val) {
  switch (errno_val) {
  case ENOTTY:
    return "your kernel is too old to support filesystem encryption, or the "
           "filesystem you are using does not support encryption";
  case EOPNOTSUPP:
    return "filesystem encryption has been disabled in the kernel config, or "
           "you need to enable encryption on your filesystem (see the README "
           "for more detailed instructions).";
  case ENODATA:
    return "file or directory not encrypted";
  case EEXIST:
    return "file or directory already encrypted";
  case EINVAL:
    return "invalid encryption options provided";
  default:
    return strerror(errno_val);
  }
}


x86 assembly (clang, -O0):
<policy_error>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0xffffff80,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x4,%eax
ja     1194 <policy_error+0x84>
mov    -0x18(%rbp),%rax
lea    0xec5(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xec9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11a0 <policy_error+0x90>
lea    0xf2e(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11a0 <policy_error+0x90>
lea    0xfc1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11a0 <policy_error+0x90>
lea    0xfd1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11a0 <policy_error+0x90>
lea    0xfe5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11a0 <policy_error+0x90>
mov    -0xc(%rbp),%edi
call   1030 <strerror@plt>
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<policy_error>:
lea    -0x80(%rdi),%eax
cmp    $0x5,%eax
jae    1129 <policy_error+0x19>
cltq
lea    0x105f(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
jmp    1030 <strerror@plt>

LLVM IR (-O0):
@.str = [117 x i8] c"your kernel is too old to support filesystem encryption, or the filesystem you are using does not support encryption\00"
@.str.1 = [163 x i8] c"filesystem encryption has been disabled in the kernel config, or you need to enable encryption on your filesystem (see the README for more detailed instructions).\00"
@.str.2 = [32 x i8] c"file or directory not encrypted\00"
@.str.3 = [36 x i8] c"file or directory already encrypted\00"
@.str.4 = [36 x i8] c"invalid encryption options provided\00"
define i8* @policy_error(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %10 [
i32 129, label %5
i32 128, label %6
i32 130, label %7
i32 132, label %8
i32 131, label %9
]
5: ; preds = %1
store i8* getelementptr inbounds ([117 x i8], [117 x i8]* @.str, i64 0, i64 0), i8** %2
br label %13
6: ; preds = %1
store i8* getelementptr inbounds ([163 x i8], [163 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %13
7: ; preds = %1
store i8* getelementptr inbounds ([32 x i8], [32 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %13
8: ; preds = %1
store i8* getelementptr inbounds ([36 x i8], [36 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %13
9: ; preds = %1
store i8* getelementptr inbounds ([36 x i8], [36 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %13
10: ; preds = %1
%11 = load i32, i32* %3
%12 = call i8* @strerror(i32 %11)
store i8* %12, i8** %2
br label %13
13: ; preds = %10, %9, %8, %7, %6, %5
%14 = load i8*, i8** %2
ret i8* %14
}

LLVM IR (-O2):
@.str = [117 x i8] c"your kernel is too old to support filesystem encryption, or the filesystem you are using does not support encryption\00"
@.str.1 = [163 x i8] c"filesystem encryption has been disabled in the kernel config, or you need to enable encryption on your filesystem (see the README for more detailed instructions).\00"
@.str.2 = [32 x i8] c"file or directory not encrypted\00"
@.str.3 = [36 x i8] c"file or directory already encrypted\00"
@.str.4 = [36 x i8] c"invalid encryption options provided\00"
@reltable.policy_error = [5 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([163 x i8]* @.str.1 to i64), i64 ptrtoint ([5 x i32]* @reltable.policy_error to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([117 x i8]* @.str to i64), i64 ptrtoint ([5 x i32]* @reltable.policy_error to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([32 x i8]* @.str.2 to i64), i64 ptrtoint ([5 x i32]* @reltable.policy_error to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([36 x i8]* @.str.4 to i64), i64 ptrtoint ([5 x i32]* @reltable.policy_error to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([36 x i8]* @.str.3 to i64), i64 ptrtoint ([5 x i32]* @reltable.policy_error to i64)) to i32)]
define i8* @policy_error(i32 %0) {
%2 = add i32 %0, -128
%3 = icmp ult i32 %2, 5
br i1 %3, label %6, label %4
4: ; preds = %1
%5 = tail call i8* @strerror(i32 %0)
br label %10
6: ; preds = %1
%7 = sext i32 %2 to i64
%8 = shl i64 %7, 2
%9 = call i8* @llvm.load.relative.i64(i8* bitcast ([5 x i32]* @reltable.policy_error to i8*), i64 %8)
br label %10
10: ; preds = %6, %4
%11 = phi i8* [ %5, %4 ], [ %9, %6 ]
ret i8* %11
}