int mus_format2bytes(int format) {
  switch (format) {
  case 3:
    return (1);
    break;
  case 1:
    return (2);
    break;
  case 7:
    return (1);
    break;
  case 2:
    return (1);
    break;
  case 6:
    return (1);
    break;
  case 5:
    return (4);
    break;
  case 4:
    return (4);
    break;
  case 8:
    return (3);
    break;
  case 9:
    return (8);
    break;
  case 10:
    return (2);
    break;
  case 11:
    return (4);
    break;
  case 12:
    return (4);
    break;
  case 13:
    return (8);
    break;
  case 16:
    return (3);
    break;
  case 14:
    return (2);
    break;
  case 15:
    return (2);
    break;
  case 17:
    return (4);
    break;
  default:
    return (1);
    break;
  }
}


x86 assembly (clang, -O0):
<mus_format2bytes>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0x8(%rbp)
mov    -0x8(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,%ecx
mov    %rcx,-0x10(%rbp)
sub    $0x10,%eax
ja     11fc <mus_format2bytes+0xfc>
mov    -0x10(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
movl   $0x1,-0x4(%rbp)
jmp    1203 <mus_format2bytes+0x103>
movl   $0x2,-0x4(%rbp)
jmp    1203 <mus_format2bytes+0x103>
movl   $0x1,-0x4(%rbp)
jmp    1203 <mus_format2bytes+0x103>
movl   $0x1,-0x4(%rbp)
jmp    1203 <mus_format2bytes+0x103>
movl   $0x1,-0x4(%rbp)
jmp    1203 <mus_format2bytes+0x103>
movl   $0x4,-0x4(%rbp)
jmp    1203 <mus_format2bytes+0x103>
movl   $0x4,-0x4(%rbp)
jmp    1203 <mus_format2bytes+0x103>
movl   $0x3,-0x4(%rbp)
jmp    1203 <mus_format2bytes+0x103>
movl   $0x8,-0x4(%rbp)
jmp    1203 <mus_format2bytes+0x103>
movl   $0x2,-0x4(%rbp)
jmp    1203 <mus_format2bytes+0x103>
movl   $0x4,-0x4(%rbp)
jmp    1203 <mus_format2bytes+0x103>
movl   $0x4,-0x4(%rbp)
jmp    1203 <mus_format2bytes+0x103>
movl   $0x8,-0x4(%rbp)
jmp    1203 <mus_format2bytes+0x103>
movl   $0x3,-0x4(%rbp)
jmp    1203 <mus_format2bytes+0x103>
movl   $0x2,-0x4(%rbp)
jmp    1203 <mus_format2bytes+0x103>
movl   $0x2,-0x4(%rbp)
jmp    1203 <mus_format2bytes+0x103>
movl   $0x4,-0x4(%rbp)
jmp    1203 <mus_format2bytes+0x103>
movl   $0x1,-0x4(%rbp)
mov    -0x4(%rbp),%eax
pop    %rbp
ret

x86 assembly (clang, -O2):
<mus_format2bytes>:
add    $0xffffffff,%edi
mov    $0x1,%eax
cmp    $0x10,%edi
ja     111a <mus_format2bytes+0x1a>
movslq %edi,%rax
lea    0xee9(%rip),%rcx
mov    (%rcx,%rax,4),%eax
ret

LLVM IR (-O0):
define i32 @mus_format2bytes(i32 %0) {
%2 = alloca i32
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %22 [
i32 3, label %5
i32 1, label %6
i32 7, label %7
i32 2, label %8
i32 6, label %9
i32 5, label %10
i32 4, label %11
i32 8, label %12
i32 9, label %13
i32 10, label %14
i32 11, label %15
i32 12, label %16
i32 13, label %17
i32 16, label %18
i32 14, label %19
i32 15, label %20
i32 17, label %21
]
5: ; preds = %1
store i32 1, i32* %2
br label %23
6: ; preds = %1
store i32 2, i32* %2
br label %23
7: ; preds = %1
store i32 1, i32* %2
br label %23
8: ; preds = %1
store i32 1, i32* %2
br label %23
9: ; preds = %1
store i32 1, i32* %2
br label %23
10: ; preds = %1
store i32 4, i32* %2
br label %23
11: ; preds = %1
store i32 4, i32* %2
br label %23
12: ; preds = %1
store i32 3, i32* %2
br label %23
13: ; preds = %1
store i32 8, i32* %2
br label %23
14: ; preds = %1
store i32 2, i32* %2
br label %23
15: ; preds = %1
store i32 4, i32* %2
br label %23
16: ; preds = %1
store i32 4, i32* %2
br label %23
17: ; preds = %1
store i32 8, i32* %2
br label %23
18: ; preds = %1
store i32 3, i32* %2
br label %23
19: ; preds = %1
store i32 2, i32* %2
br label %23
20: ; preds = %1
store i32 2, i32* %2
br label %23
21: ; preds = %1
store i32 4, i32* %2
br label %23
22: ; preds = %1
store i32 1, i32* %2
br label %23
23: ; preds = %22, %21, %20, %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%24 = load i32, i32* %2
ret i32 %24
}

LLVM IR (-O2):
@switch.table.mus_format2bytes = [17 x i32] [i32 2, i32 1, i32 1, i32 4, i32 4, i32 1, i32 1, i32 3, i32 8, i32 2, i32 4, i32 4, i32 8, i32 2, i32 2, i32 3, i32 4]
define i32 @mus_format2bytes(i32 %0) {
%2 = add i32 %0, -1
%3 = icmp ult i32 %2, 17
br i1 %3, label %4, label %8
4: ; preds = %1
%5 = sext i32 %2 to i64
%6 = getelementptr inbounds [17 x i32], [17 x i32]* @switch.table.mus_format2bytes, i64 0, i64 %5
%7 = load i32, i32* %6
br label %8
8: ; preds = %4, %1
%9 = phi i32 [ 1, %1 ], [ %7, %4 ]
ret i32 %9
}