const char *audio_ext_format(unsigned char x) {
  switch (x) {
  case 4:
    return "MPEG-4 HE AAC";
  case 5:
    return "MPEG-4 HE AAC v2";
  case 6:
    return "MPEG-4 AAC LC";
  case 7:
    return "DRA";
  case 8:
    return "MPEG-4 HE AAC + MPEG Surround";
  case 10:
    return "MPEG-4 AAC LC + MPEG Surround";
  case 11:
    return "MPEG-H 3D Audio";
  case 12:
    return "AC-4";
  case 13:
    return "L-PCM 3D Audio";
  default:
    return "RESERVED";
  }
  return "BROKEN";
}


x86 assembly (clang, -O0):
<audio_ext_format>:
push   %rbp
mov    %rsp,%rbp
mov    %dil,%al
mov    %al,-0x9(%rbp)
movzbl -0x9(%rbp),%eax
add    $0xfffffffc,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x9,%eax
ja     11c4 <audio_ext_format+0xc4>
mov    -0x18(%rbp),%rax
lea    0xed5(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xeed(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <audio_ext_format+0xcf>
lea    0xeeb(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <audio_ext_format+0xcf>
lea    0xeec(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <audio_ext_format+0xcf>
lea    0xeea(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <audio_ext_format+0xcf>
lea    0xede(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <audio_ext_format+0xcf>
lea    0xeec(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <audio_ext_format+0xcf>
lea    0xefa(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <audio_ext_format+0xcf>
lea    0xefa(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <audio_ext_format+0xcf>
lea    0xeef(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <audio_ext_format+0xcf>
lea    0xeee(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<audio_ext_format>:
add    $0xfc,%dil
cmp    $0x9,%dil
ja     111d <audio_ext_format+0x1d>
movsbq %dil,%rax
lea    0xf87(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf6d(%rip),%rax
ret

LLVM IR (-O0):
@.str = [14 x i8] c"MPEG-4 HE AAC\00"
@.str.1 = [17 x i8] c"MPEG-4 HE AAC v2\00"
@.str.2 = [14 x i8] c"MPEG-4 AAC LC\00"
@.str.3 = [4 x i8] c"DRA\00"
@.str.4 = [30 x i8] c"MPEG-4 HE AAC + MPEG Surround\00"
@.str.5 = [30 x i8] c"MPEG-4 AAC LC + MPEG Surround\00"
@.str.6 = [16 x i8] c"MPEG-H 3D Audio\00"
@.str.7 = [5 x i8] c"AC-4\00"
@.str.8 = [15 x i8] c"L-PCM 3D Audio\00"
@.str.9 = [9 x i8] c"RESERVED\00"
define i8* @audio_ext_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 %15 [
i32 4, label %6
i32 5, label %7
i32 6, label %8
i32 7, label %9
i32 8, label %10
i32 10, label %11
i32 11, label %12
i32 12, label %13
i32 13, label %14
]
6: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str, i64 0, i64 0), i8** %2
br label %16
7: ; preds = %1
store i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %16
8: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %16
9: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %16
10: ; preds = %1
store i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %16
11: ; preds = %1
store i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %16
12: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %16
13: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %16
14: ; preds = %1
store i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %16
15: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %16
16: ; preds = %15, %14, %13, %12, %11, %10, %9, %8, %7, %6
%17 = load i8*, i8** %2
ret i8* %17
}

LLVM IR (-O2):
@.str = [14 x i8] c"MPEG-4 HE AAC\00"
@.str.1 = [17 x i8] c"MPEG-4 HE AAC v2\00"
@.str.2 = [14 x i8] c"MPEG-4 AAC LC\00"
@.str.3 = [4 x i8] c"DRA\00"
@.str.4 = [30 x i8] c"MPEG-4 HE AAC + MPEG Surround\00"
@.str.5 = [30 x i8] c"MPEG-4 AAC LC + MPEG Surround\00"
@.str.6 = [16 x i8] c"MPEG-H 3D Audio\00"
@.str.7 = [5 x i8] c"AC-4\00"
@.str.8 = [15 x i8] c"L-PCM 3D Audio\00"
@.str.9 = [9 x i8] c"RESERVED\00"
@reltable.audio_ext_format = [10 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str to i64), i64 ptrtoint ([10 x i32]* @reltable.audio_ext_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([17 x i8]* @.str.1 to i64), i64 ptrtoint ([10 x i32]* @reltable.audio_ext_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.2 to i64), i64 ptrtoint ([10 x i32]* @reltable.audio_ext_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.3 to i64), i64 ptrtoint ([10 x i32]* @reltable.audio_ext_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([30 x i8]* @.str.4 to i64), i64 ptrtoint ([10 x i32]* @reltable.audio_ext_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([9 x i8]* @.str.9 to i64), i64 ptrtoint ([10 x i32]* @reltable.audio_ext_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([30 x i8]* @.str.5 to i64), i64 ptrtoint ([10 x i32]* @reltable.audio_ext_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.6 to i64), i64 ptrtoint ([10 x i32]* @reltable.audio_ext_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.7 to i64), i64 ptrtoint ([10 x i32]* @reltable.audio_ext_format to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([15 x i8]* @.str.8 to i64), i64 ptrtoint ([10 x i32]* @reltable.audio_ext_format to i64)) to i32)]
define i8* @audio_ext_format(i8 zeroext %0) {
%2 = add i8 %0, -4
%3 = icmp ult i8 %2, 10
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 ([10 x i32]* @reltable.audio_ext_format to i8*), i64 %6)
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ getelementptr inbounds ([9 x i8], [9 x i8]* @.str.9, i64 0, i64 0), %1 ]
ret i8* %9
}