#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 EACCES 135
#define EBADF 134
#define EEXIST 133
#define EINVAL 132
#define ENAMETOOLONG 131
#define ENOENT 130
#define ENOTDIR 129
#define EROFS 128
char *edesc(int err) {
  switch (err) {
  case ENOENT:
    return "file does not exist";
  case ENOTDIR:
    return "is not a directory";
  case EACCES:
    return "access denied";
  case EBADF:
    return "bad file descriptor";
  case EEXIST:
    return "the file exists";
  case ENAMETOOLONG:
    return "filename too long";
  case EROFS:
    return "write access requested on a read-only filesystem";
  case EINVAL:
    return "flag is invalid";
  default:
    return "unknown error";
  }
}


x86 assembly (clang, -O0):
<edesc>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0xffffff80,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x7,%eax
ja     11b0 <edesc+0xb0>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xee9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bb <edesc+0xbb>
lea    0xeed(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bb <edesc+0xbb>
lea    0xef0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bb <edesc+0xbb>
lea    0xeee(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bb <edesc+0xbb>
lea    0xef2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bb <edesc+0xbb>
lea    0xef2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bb <edesc+0xbb>
lea    0xef4(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bb <edesc+0xbb>
lea    0xf15(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bb <edesc+0xbb>
lea    0xf15(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<edesc>:
add    $0xffffff80,%edi
cmp    $0x7,%edi
ja     111a <edesc+0x1a>
movslq %edi,%rax
lea    0xfaa(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf8b(%rip),%rax
ret

LLVM IR (-O0):
@.str = [20 x i8] c"file does not exist\00"
@.str.1 = [19 x i8] c"is not a directory\00"
@.str.2 = [14 x i8] c"access denied\00"
@.str.3 = [20 x i8] c"bad file descriptor\00"
@.str.4 = [16 x i8] c"the file exists\00"
@.str.5 = [18 x i8] c"filename too long\00"
@.str.6 = [49 x i8] c"write access requested on a read-only filesystem\00"
@.str.7 = [16 x i8] c"flag is invalid\00"
@.str.8 = [14 x i8] c"unknown error\00"
define i8* @edesc(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %13 [
i32 130, label %5
i32 129, label %6
i32 135, label %7
i32 134, label %8
i32 133, label %9
i32 131, label %10
i32 128, label %11
i32 132, label %12
]
5: ; preds = %1
store i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i8** %2
br label %14
6: ; preds = %1
store i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %14
7: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %14
8: ; preds = %1
store i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %14
9: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %14
10: ; preds = %1
store i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %14
11: ; preds = %1
store i8* getelementptr inbounds ([49 x i8], [49 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %14
12: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %14
13: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %14
14: ; preds = %13, %12, %11, %10, %9, %8, %7, %6, %5
%15 = load i8*, i8** %2
ret i8* %15
}

LLVM IR (-O2):
@.str = [20 x i8] c"file does not exist\00"
@.str.1 = [19 x i8] c"is not a directory\00"
@.str.2 = [14 x i8] c"access denied\00"
@.str.3 = [20 x i8] c"bad file descriptor\00"
@.str.4 = [16 x i8] c"the file exists\00"
@.str.5 = [18 x i8] c"filename too long\00"
@.str.6 = [49 x i8] c"write access requested on a read-only filesystem\00"
@.str.7 = [16 x i8] c"flag is invalid\00"
@.str.8 = [14 x i8] c"unknown error\00"
@reltable.edesc = [8 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([49 x i8]* @.str.6 to i64), i64 ptrtoint ([8 x i32]* @reltable.edesc to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([19 x i8]* @.str.1 to i64), i64 ptrtoint ([8 x i32]* @reltable.edesc to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([20 x i8]* @.str to i64), i64 ptrtoint ([8 x i32]* @reltable.edesc to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([18 x i8]* @.str.5 to i64), i64 ptrtoint ([8 x i32]* @reltable.edesc to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.7 to i64), i64 ptrtoint ([8 x i32]* @reltable.edesc to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.4 to i64), i64 ptrtoint ([8 x i32]* @reltable.edesc to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([20 x i8]* @.str.3 to i64), i64 ptrtoint ([8 x i32]* @reltable.edesc to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.2 to i64), i64 ptrtoint ([8 x i32]* @reltable.edesc to i64)) to i32)]
define i8* @edesc(i32 %0) {
%2 = add i32 %0, -128
%3 = icmp ult i32 %2, 8
br i1 %3, label %4, label %8
4: ; preds = %1
%5 = sext i32 %2 to i64
%6 = shl i64 %5, 2
%7 = call i8* @llvm.load.relative.i64(i8* bitcast ([8 x i32]* @reltable.edesc to i8*), i64 %6)
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ getelementptr inbounds ([14 x i8], [14 x i8]* @.str.8, i64 0, i64 0), %1 ]
ret i8* %9
}