char *numbers(int index) {
  switch (index) {
  case 0:
    return "zero";
  case 1:
    return "one";
  case 2:
    return "two";
  case 3:
    return "tres";
  case 4:
    return "quattro";
  case 5:
    return "fümf";
  case 6:
    return "shest";
  case 7:
    return "sju";
  case 8:
    return "otto";
  case 9:
    return "nueve";
  case 10:
    return "dix";
  case 11:
    return "undici";
  case 12:
    return "tolv";
  case 13:
    return "trinatsat";
  case 14:
    return "quatorze";
  case 15:
    return "fümfzehn";
  default:
    return "invalid";
  }
}


x86 assembly (clang, -O0):
<numbers>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
mov    %rax,-0x18(%rbp)
sub    $0xf,%rax
ja     122c <numbers+0x12c>
mov    -0x18(%rbp),%rax
lea    0xedd(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf0d(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1237 <numbers+0x137>
lea    0xf02(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1237 <numbers+0x137>
lea    0xef6(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1237 <numbers+0x137>
lea    0xeea(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1237 <numbers+0x137>
lea    0xedf(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1237 <numbers+0x137>
lea    0xed7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1237 <numbers+0x137>
lea    0xecd(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1237 <numbers+0x137>
lea    0xec3(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1237 <numbers+0x137>
lea    0xeb7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1237 <numbers+0x137>
lea    0xeac(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1237 <numbers+0x137>
lea    0xea2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1237 <numbers+0x137>
lea    0xe96(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1237 <numbers+0x137>
lea    0xe8d(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1237 <numbers+0x137>
lea    0xe82(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1237 <numbers+0x137>
lea    0xe7c(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1237 <numbers+0x137>
lea    0xe75(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1237 <numbers+0x137>
lea    0xe6f(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<numbers>:
cmp    $0xf,%edi
ja     1117 <numbers+0x17>
movslq %edi,%rax
lea    0xf5d(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf44(%rip),%rax
ret

LLVM IR (-O0):
@.str = [5 x i8] c"zero\00"
@.str.1 = [4 x i8] c"one\00"
@.str.2 = [4 x i8] c"two\00"
@.str.3 = [5 x i8] c"tres\00"
@.str.4 = [8 x i8] c"quattro\00"
@.str.5 = [6 x i8] c"f\C3\BCmf\00"
@.str.6 = [6 x i8] c"shest\00"
@.str.7 = [4 x i8] c"sju\00"
@.str.8 = [5 x i8] c"otto\00"
@.str.9 = [6 x i8] c"nueve\00"
@.str.10 = [4 x i8] c"dix\00"
@.str.11 = [7 x i8] c"undici\00"
@.str.12 = [5 x i8] c"tolv\00"
@.str.13 = [10 x i8] c"trinatsat\00"
@.str.14 = [9 x i8] c"quatorze\00"
@.str.15 = [10 x i8] c"f\C3\BCmfzehn\00"
@.str.16 = [8 x i8] c"invalid\00"
define i8* @numbers(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %21 [
i32 0, label %5
i32 1, label %6
i32 2, label %7
i32 3, label %8
i32 4, label %9
i32 5, label %10
i32 6, label %11
i32 7, label %12
i32 8, label %13
i32 9, label %14
i32 10, label %15
i32 11, label %16
i32 12, label %17
i32 13, label %18
i32 14, label %19
i32 15, label %20
]
5: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8** %2
br label %22
6: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %22
7: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %22
8: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %22
9: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %22
10: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %22
11: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %22
12: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %22
13: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %22
14: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %22
15: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.10, i64 0, i64 0), i8** %2
br label %22
16: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %22
17: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.12, i64 0, i64 0), i8** %2
br label %22
18: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %22
19: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.14, i64 0, i64 0), i8** %2
br label %22
20: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.15, i64 0, i64 0), i8** %2
br label %22
21: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.16, i64 0, i64 0), i8** %2
br label %22
22: ; preds = %21, %20, %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%23 = load i8*, i8** %2
ret i8* %23
}

LLVM IR (-O2):
@.str = [5 x i8] c"zero\00"
@.str.1 = [4 x i8] c"one\00"
@.str.2 = [4 x i8] c"two\00"
@.str.3 = [5 x i8] c"tres\00"
@.str.4 = [8 x i8] c"quattro\00"
@.str.5 = [6 x i8] c"f\C3\BCmf\00"
@.str.6 = [6 x i8] c"shest\00"
@.str.7 = [4 x i8] c"sju\00"
@.str.8 = [5 x i8] c"otto\00"
@.str.9 = [6 x i8] c"nueve\00"
@.str.10 = [4 x i8] c"dix\00"
@.str.11 = [7 x i8] c"undici\00"
@.str.12 = [5 x i8] c"tolv\00"
@.str.13 = [10 x i8] c"trinatsat\00"
@.str.14 = [9 x i8] c"quatorze\00"
@.str.15 = [10 x i8] c"f\C3\BCmfzehn\00"
@.str.16 = [8 x i8] c"invalid\00"
@reltable.numbers = [16 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str to i64), i64 ptrtoint ([16 x i32]* @reltable.numbers to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.1 to i64), i64 ptrtoint ([16 x i32]* @reltable.numbers to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.2 to i64), i64 ptrtoint ([16 x i32]* @reltable.numbers to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.3 to i64), i64 ptrtoint ([16 x i32]* @reltable.numbers to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.4 to i64), i64 ptrtoint ([16 x i32]* @reltable.numbers to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.5 to i64), i64 ptrtoint ([16 x i32]* @reltable.numbers to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.6 to i64), i64 ptrtoint ([16 x i32]* @reltable.numbers to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.7 to i64), i64 ptrtoint ([16 x i32]* @reltable.numbers to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.8 to i64), i64 ptrtoint ([16 x i32]* @reltable.numbers to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.9 to i64), i64 ptrtoint ([16 x i32]* @reltable.numbers to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.10 to i64), i64 ptrtoint ([16 x i32]* @reltable.numbers to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.11 to i64), i64 ptrtoint ([16 x i32]* @reltable.numbers to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.12 to i64), i64 ptrtoint ([16 x i32]* @reltable.numbers to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.13 to i64), i64 ptrtoint ([16 x i32]* @reltable.numbers to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([9 x i8]* @.str.14 to i64), i64 ptrtoint ([16 x i32]* @reltable.numbers to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.15 to i64), i64 ptrtoint ([16 x i32]* @reltable.numbers to i64)) to i32)]
define i8* @numbers(i32 %0) {
%2 = icmp ult i32 %0, 16
br i1 %2, label %3, label %7
3: ; preds = %1
%4 = sext i32 %0 to i64
%5 = shl i64 %4, 2
%6 = call i8* @llvm.load.relative.i64(i8* bitcast ([16 x i32]* @reltable.numbers 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.16, i64 0, i64 0), %1 ]
ret i8* %8
}