char *rad_code_str(unsigned char code) {
  switch (code) {
  case 1:
    return ("Access-Request");
  case 2:
    return ("Access-Accept");
  case 3:
    return ("Access-Reject");
  case 4:
    return ("Accounting-Request");
  case 5:
    return ("Accounting-Response");
  case 11:
    return ("Access-Challenge");
  case 12:
    return ("Status-Server");
  case 13:
    return ("Status-Client");
  default:
    return ("?");
  }
}


x86 assembly (clang, -O0):
<rad_code_str>:
push   %rbp
mov    %rsp,%rbp
mov    %dil,%al
mov    %al,-0x9(%rbp)
movzbl -0x9(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0xc,%eax
ja     11b4 <rad_code_str+0xb4>
mov    -0x18(%rbp),%rax
lea    0xed5(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xef9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bf <rad_code_str+0xbf>
lea    0xef8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bf <rad_code_str+0xbf>
lea    0xef6(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bf <rad_code_str+0xbf>
lea    0xef4(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bf <rad_code_str+0xbf>
lea    0xef7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bf <rad_code_str+0xbf>
lea    0xefb(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bf <rad_code_str+0xbf>
lea    0xefc(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bf <rad_code_str+0xbf>
lea    0xefa(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bf <rad_code_str+0xbf>
lea    0xef8(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<rad_code_str>:
add    $0xff,%dil
cmp    $0xc,%dil
ja     111d <rad_code_str+0x1d>
movsbq %dil,%rax
lea    0xf6f(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf5b(%rip),%rax
ret

LLVM IR (-O0):
@.str = [15 x i8] c"Access-Request\00"
@.str.1 = [14 x i8] c"Access-Accept\00"
@.str.2 = [14 x i8] c"Access-Reject\00"
@.str.3 = [19 x i8] c"Accounting-Request\00"
@.str.4 = [20 x i8] c"Accounting-Response\00"
@.str.5 = [17 x i8] c"Access-Challenge\00"
@.str.6 = [14 x i8] c"Status-Server\00"
@.str.7 = [14 x i8] c"Status-Client\00"
@.str.8 = [2 x i8] c"?\00"
define i8* @rad_code_str(i8 zeroext %0) {
%2 = alloca i8*
%3 = alloca i8
store i8 %0, i8* %3
%4 = load i8, i8* %3
%5 = zext i8 %4 to i32
switch i32 %5, label %14 [
i32 1, label %6
i32 2, label %7
i32 3, label %8
i32 4, label %9
i32 5, label %10
i32 11, label %11
i32 12, label %12
i32 13, label %13
]
6: ; preds = %1
store i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i64 0, i64 0), i8** %2
br label %15
7: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %15
8: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %15
9: ; preds = %1
store i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %15
10: ; preds = %1
store i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %15
11: ; preds = %1
store i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %15
12: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %15
13: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %15
14: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %15
15: ; preds = %14, %13, %12, %11, %10, %9, %8, %7, %6
%16 = load i8*, i8** %2
ret i8* %16
}

LLVM IR (-O2):
@.str = [15 x i8] c"Access-Request\00"
@.str.1 = [14 x i8] c"Access-Accept\00"
@.str.2 = [14 x i8] c"Access-Reject\00"
@.str.3 = [19 x i8] c"Accounting-Request\00"
@.str.4 = [20 x i8] c"Accounting-Response\00"
@.str.5 = [17 x i8] c"Access-Challenge\00"
@.str.6 = [14 x i8] c"Status-Server\00"
@.str.7 = [14 x i8] c"Status-Client\00"
@.str.8 = [2 x i8] c"?\00"
@reltable.rad_code_str = [13 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([15 x i8]* @.str to i64), i64 ptrtoint ([13 x i32]* @reltable.rad_code_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.1 to i64), i64 ptrtoint ([13 x i32]* @reltable.rad_code_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.2 to i64), i64 ptrtoint ([13 x i32]* @reltable.rad_code_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([19 x i8]* @.str.3 to i64), i64 ptrtoint ([13 x i32]* @reltable.rad_code_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([20 x i8]* @.str.4 to i64), i64 ptrtoint ([13 x i32]* @reltable.rad_code_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.8 to i64), i64 ptrtoint ([13 x i32]* @reltable.rad_code_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.8 to i64), i64 ptrtoint ([13 x i32]* @reltable.rad_code_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.8 to i64), i64 ptrtoint ([13 x i32]* @reltable.rad_code_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.8 to i64), i64 ptrtoint ([13 x i32]* @reltable.rad_code_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.8 to i64), i64 ptrtoint ([13 x i32]* @reltable.rad_code_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([17 x i8]* @.str.5 to i64), i64 ptrtoint ([13 x i32]* @reltable.rad_code_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.6 to i64), i64 ptrtoint ([13 x i32]* @reltable.rad_code_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.7 to i64), i64 ptrtoint ([13 x i32]* @reltable.rad_code_str to i64)) to i32)]
define i8* @rad_code_str(i8 zeroext %0) {
%2 = add i8 %0, -1
%3 = icmp ult i8 %2, 13
br i1 %3, label %4, label %8
4: ; preds = %1
%5 = sext i8 %2 to i64
%6 = shl i64 %5, 2
%7 = call i8* @llvm.load.relative.i64(i8* bitcast ([13 x i32]* @reltable.rad_code_str to i8*), i64 %6)
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ getelementptr inbounds ([2 x i8], [2 x i8]* @.str.8, i64 0, i64 0), %1 ]
ret i8* %9
}