const char *audio_format(unsigned char x) {
  switch (x) {
  case 0:
    return "RESERVED";
  case 1:
    return "Linear PCM";
  case 2:
    return "AC-3";
  case 3:
    return "MPEG 1 (Layers 1 & 2)";
  case 4:
    return "MPEG 1 Layer 3 (MP3)";
  case 5:
    return "MPEG2 (multichannel)";
  case 6:
    return "AAC";
  case 7:
    return "DTS";
  case 8:
    return "ATRAC";
  case 9:
    return "One Bit Audio";
  case 10:
    return "Dolby Digital+";
  case 11:
    return "DTS-HD";
  case 12:
    return "MAT (MLP)";
  case 13:
    return "DST";
  case 14:
    return "WMA Pro";
  case 15:
    return "RESERVED";
  }
  return "BROKEN";
}


x86 assembly (clang, -O0):
<audio_format>:
push   %rbp
mov    %rsp,%rbp
mov    %dil,%al
mov    %al,-0x9(%rbp)
movzbl -0x9(%rbp),%eax
mov    %rax,-0x18(%rbp)
sub    $0xf,%rax
ja     1230 <audio_format+0x130>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf09(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123b <audio_format+0x13b>
lea    0xf02(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123b <audio_format+0x13b>
lea    0xefd(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123b <audio_format+0x13b>
lea    0xef2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123b <audio_format+0x13b>
lea    0xef8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123b <audio_format+0x13b>
lea    0xefd(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123b <audio_format+0x13b>
lea    0xf02(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123b <audio_format+0x13b>
lea    0xef6(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123b <audio_format+0x13b>
lea    0xeea(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123b <audio_format+0x13b>
lea    0xee0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123b <audio_format+0x13b>
lea    0xede(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123b <audio_format+0x13b>
lea    0xedd(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123b <audio_format+0x13b>
lea    0xed4(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123b <audio_format+0x13b>
lea    0xece(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123b <audio_format+0x13b>
lea    0xec2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123b <audio_format+0x13b>
lea    0xe19(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123b <audio_format+0x13b>
lea    0xeaa(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<audio_format>:
cmp    $0xf,%dil
ja     1119 <audio_format+0x19>
movsbq %dil,%rax
lea    0xf97(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf81(%rip),%rax
ret

LLVM IR (-O0):
@.str = [9 x i8] c"RESERVED\00"
@.str.1 = [11 x i8] c"Linear PCM\00"
@.str.2 = [5 x i8] c"AC-3\00"
@.str.3 = [22 x i8] c"MPEG 1 (Layers 1 & 2)\00"
@.str.4 = [21 x i8] c"MPEG 1 Layer 3 (MP3)\00"
@.str.5 = [21 x i8] c"MPEG2 (multichannel)\00"
@.str.6 = [4 x i8] c"AAC\00"
@.str.7 = [4 x i8] c"DTS\00"
@.str.8 = [6 x i8] c"ATRAC\00"
@.str.9 = [14 x i8] c"One Bit Audio\00"
@.str.10 = [15 x i8] c"Dolby Digital+\00"
@.str.11 = [7 x i8] c"DTS-HD\00"
@.str.12 = [10 x i8] c"MAT (MLP)\00"
@.str.13 = [4 x i8] c"DST\00"
@.str.14 = [8 x i8] c"WMA Pro\00"
@.str.15 = [7 x i8] c"BROKEN\00"
define i8* @audio_format(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 %22 [
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 13, label %19
i32 14, label %20
i32 15, label %21
]
6: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), i8** %2
br label %23
7: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %23
8: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %23
9: ; preds = %1
store i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %23
10: ; preds = %1
store i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %23
11: ; preds = %1
store i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %23
12: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %23
13: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %23
14: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %23
15: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %23
16: ; preds = %1
store i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str.10, i64 0, i64 0), i8** %2
br label %23
17: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %23
18: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.12, i64 0, i64 0), i8** %2
br label %23
19: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %23
20: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.14, i64 0, i64 0), i8** %2
br label %23
21: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), i8** %2
br label %23
22: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.15, i64 0, i64 0), i8** %2
br label %23
23: ; preds = %22, %21, %20, %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6
%24 = load i8*, i8** %2
ret i8* %24
}

LLVM IR (-O2):
@.str = [9 x i8] c"RESERVED\00"
@.str.1 = [11 x i8] c"Linear PCM\00"
@.str.2 = [5 x i8] c"AC-3\00"
@.str.3 = [22 x i8] c"MPEG 1 (Layers 1 & 2)\00"
@.str.4 = [21 x i8] c"MPEG 1 Layer 3 (MP3)\00"
@.str.5 = [21 x i8] c"MPEG2 (multichannel)\00"
@.str.6 = [4 x i8] c"AAC\00"
@.str.7 = [4 x i8] c"DTS\00"
@.str.8 = [6 x i8] c"ATRAC\00"
@.str.9 = [14 x i8] c"One Bit Audio\00"
@.str.10 = [15 x i8] c"Dolby Digital+\00"
@.str.11 = [7 x i8] c"DTS-HD\00"
@.str.12 = [10 x i8] c"MAT (MLP)\00"
@.str.13 = [4 x i8] c"DST\00"
@.str.14 = [8 x i8] c"WMA Pro\00"
@.str.15 = [7 x i8] c"BROKEN\00"
@reltable.audio_format = [16 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([9 x i8]* @.str to i64), i64 ptrtoint ([16 x i32]* @reltable.audio_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([11 x i8]* @.str.1 to i64), i64 ptrtoint ([16 x i32]* @reltable.audio_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.2 to i64), i64 ptrtoint ([16 x i32]* @reltable.audio_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([22 x i8]* @.str.3 to i64), i64 ptrtoint ([16 x i32]* @reltable.audio_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([21 x i8]* @.str.4 to i64), i64 ptrtoint ([16 x i32]* @reltable.audio_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([21 x i8]* @.str.5 to i64), i64 ptrtoint ([16 x i32]* @reltable.audio_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.6 to i64), i64 ptrtoint ([16 x i32]* @reltable.audio_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.7 to i64), i64 ptrtoint ([16 x i32]* @reltable.audio_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.8 to i64), i64 ptrtoint ([16 x i32]* @reltable.audio_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.9 to i64), i64 ptrtoint ([16 x i32]* @reltable.audio_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([15 x i8]* @.str.10 to i64), i64 ptrtoint ([16 x i32]* @reltable.audio_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.11 to i64), i64 ptrtoint ([16 x i32]* @reltable.audio_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.12 to i64), i64 ptrtoint ([16 x i32]* @reltable.audio_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.13 to i64), i64 ptrtoint ([16 x i32]* @reltable.audio_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.14 to i64), i64 ptrtoint ([16 x i32]* @reltable.audio_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([9 x i8]* @.str to i64), i64 ptrtoint ([16 x i32]* @reltable.audio_format to i64)) to i32)]
define i8* @audio_format(i8 zeroext %0) {
%2 = icmp ult i8 %0, 16
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 ([16 x i32]* @reltable.audio_format to i8*), i64 %5)
br label %7
7: ; preds = %1, %3
%8 = phi i8* [ %6, %3 ], [ getelementptr inbounds ([7 x i8], [7 x i8]* @.str.15, i64 0, i64 0), %1 ]
ret i8* %8
}