const char *COBTYPE_NAME(unsigned char fn_code) {
  switch (fn_code) {
  case 0X00:
    return "NMT";
  case 0x01:
    return "SYNC_EMERGENCY";
  case 0x02:
    return "TIMESTAMP";
  case 0x03:
    return "TxPDO1";
  case 0x04:
    return "RxPDO1";
  case 0x05:
    return "TxPDO2";
  case 0x06:
    return "RxPDO2";
  case 0x07:
    return "TxPDO3";
  case 0x08:
    return "RxPDO3";
  case 0x09:
    return "TxPDO4";
  case 0x0a:
    return "RxPDO4";
  case 0x0b:
    return "TxSDO";
  case 0x0c:
    return "RxSDO";
  case 0x0e:
    return "ERRCTL";
  }
  return "Unknown";
}


x86 assembly (clang, -O0):
<COBTYPE_NAME>:
push   %rbp
mov    %rsp,%rbp
mov    %dil,%al
mov    %al,-0x9(%rbp)
movzbl -0x9(%rbp),%eax
mov    %rax,-0x18(%rbp)
sub    $0xe,%rax
ja     1210 <COBTYPE_NAME+0x110>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf05(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <COBTYPE_NAME+0x11b>
lea    0xef9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <COBTYPE_NAME+0x11b>
lea    0xef8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <COBTYPE_NAME+0x11b>
lea    0xef2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <COBTYPE_NAME+0x11b>
lea    0xee9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <COBTYPE_NAME+0x11b>
lea    0xee0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <COBTYPE_NAME+0x11b>
lea    0xed7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <COBTYPE_NAME+0x11b>
lea    0xece(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <COBTYPE_NAME+0x11b>
lea    0xec5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <COBTYPE_NAME+0x11b>
lea    0xebc(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <COBTYPE_NAME+0x11b>
lea    0xeb3(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <COBTYPE_NAME+0x11b>
lea    0xeaa(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <COBTYPE_NAME+0x11b>
lea    0xea0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <COBTYPE_NAME+0x11b>
lea    0xe96(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <COBTYPE_NAME+0x11b>
lea    0xe8d(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<COBTYPE_NAME>:
cmp    $0xe,%dil
ja     1119 <COBTYPE_NAME+0x19>
movsbq %dil,%rax
lea    0xf5f(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf48(%rip),%rax
ret

LLVM IR (-O0):
@.str = [4 x i8] c"NMT\00"
@.str.1 = [15 x i8] c"SYNC_EMERGENCY\00"
@.str.2 = [10 x i8] c"TIMESTAMP\00"
@.str.3 = [7 x i8] c"TxPDO1\00"
@.str.4 = [7 x i8] c"RxPDO1\00"
@.str.5 = [7 x i8] c"TxPDO2\00"
@.str.6 = [7 x i8] c"RxPDO2\00"
@.str.7 = [7 x i8] c"TxPDO3\00"
@.str.8 = [7 x i8] c"RxPDO3\00"
@.str.9 = [7 x i8] c"TxPDO4\00"
@.str.10 = [7 x i8] c"RxPDO4\00"
@.str.11 = [6 x i8] c"TxSDO\00"
@.str.12 = [6 x i8] c"RxSDO\00"
@.str.13 = [7 x i8] c"ERRCTL\00"
@.str.14 = [8 x i8] c"Unknown\00"
define i8* @COBTYPE_NAME(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 %20 [
i32 0, label %6
i32 1, label %7
i32 2, label %8
i32 3, label %9
i32 4, label %10
i32 5, label %11
i32 6, label %12
i32 7, label %13
i32 8, label %14
i32 9, label %15
i32 10, label %16
i32 11, label %17
i32 12, label %18
i32 14, label %19
]
6: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8** %2
br label %21
7: ; preds = %1
store i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %21
8: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %21
9: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %21
10: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %21
11: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %21
12: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %21
13: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %21
14: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %21
15: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %21
16: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.10, i64 0, i64 0), i8** %2
br label %21
17: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %21
18: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.12, i64 0, i64 0), i8** %2
br label %21
19: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %21
20: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.14, i64 0, i64 0), i8** %2
br label %21
21: ; preds = %20, %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6
%22 = load i8*, i8** %2
ret i8* %22
}

LLVM IR (-O2):
@.str = [4 x i8] c"NMT\00"
@.str.1 = [15 x i8] c"SYNC_EMERGENCY\00"
@.str.2 = [10 x i8] c"TIMESTAMP\00"
@.str.3 = [7 x i8] c"TxPDO1\00"
@.str.4 = [7 x i8] c"RxPDO1\00"
@.str.5 = [7 x i8] c"TxPDO2\00"
@.str.6 = [7 x i8] c"RxPDO2\00"
@.str.7 = [7 x i8] c"TxPDO3\00"
@.str.8 = [7 x i8] c"RxPDO3\00"
@.str.9 = [7 x i8] c"TxPDO4\00"
@.str.10 = [7 x i8] c"RxPDO4\00"
@.str.11 = [6 x i8] c"TxSDO\00"
@.str.12 = [6 x i8] c"RxSDO\00"
@.str.13 = [7 x i8] c"ERRCTL\00"
@.str.14 = [8 x i8] c"Unknown\00"
@reltable.COBTYPE_NAME = [15 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str to i64), i64 ptrtoint ([15 x i32]* @reltable.COBTYPE_NAME to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([15 x i8]* @.str.1 to i64), i64 ptrtoint ([15 x i32]* @reltable.COBTYPE_NAME to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.2 to i64), i64 ptrtoint ([15 x i32]* @reltable.COBTYPE_NAME to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.3 to i64), i64 ptrtoint ([15 x i32]* @reltable.COBTYPE_NAME to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.4 to i64), i64 ptrtoint ([15 x i32]* @reltable.COBTYPE_NAME to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.5 to i64), i64 ptrtoint ([15 x i32]* @reltable.COBTYPE_NAME to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.6 to i64), i64 ptrtoint ([15 x i32]* @reltable.COBTYPE_NAME to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.7 to i64), i64 ptrtoint ([15 x i32]* @reltable.COBTYPE_NAME to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.8 to i64), i64 ptrtoint ([15 x i32]* @reltable.COBTYPE_NAME to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.9 to i64), i64 ptrtoint ([15 x i32]* @reltable.COBTYPE_NAME to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.10 to i64), i64 ptrtoint ([15 x i32]* @reltable.COBTYPE_NAME to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.11 to i64), i64 ptrtoint ([15 x i32]* @reltable.COBTYPE_NAME to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.12 to i64), i64 ptrtoint ([15 x i32]* @reltable.COBTYPE_NAME to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.14 to i64), i64 ptrtoint ([15 x i32]* @reltable.COBTYPE_NAME to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.13 to i64), i64 ptrtoint ([15 x i32]* @reltable.COBTYPE_NAME to i64)) to i32)]
define i8* @COBTYPE_NAME(i8 zeroext %0) {
%2 = icmp ult i8 %0, 15
br i1 %2, label %3, label %7
3: ; preds = %1
%4 = sext i8 %0 to i64
%5 = shl i64 %4, 2
%6 = call i8* @llvm.load.relative.i64(i8* bitcast ([15 x i32]* @reltable.COBTYPE_NAME to i8*), i64 %5)
br label %7
7: ; preds = %1, %3
%8 = phi i8* [ %6, %3 ], [ getelementptr inbounds ([8 x i8], [8 x i8]* @.str.14, i64 0, i64 0), %1 ]
ret i8* %8
}