char *nameOnes(char ones) {
  switch (ones) {
  case '1':
    return "one";
  case '2':
    return "two";
  case '3':
    return "three";
  case '4':
    return "four";
  case '5':
    return "five";
  case '6':
    return "six";
  case '7':
    return "seven";
  case '8':
    return "eight";
  case '9':
    return "nine";
  default:
    return "";
  }
}


x86 assembly (clang, -O0):
<nameOnes>:
push   %rbp
mov    %rsp,%rbp
mov    %dil,%al
mov    %al,-0x9(%rbp)
movsbl -0x9(%rbp),%eax
add    $0xffffffcf,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x8,%eax
ja     11c4 <nameOnes+0xc4>
mov    -0x18(%rbp),%rax
lea    0xed5(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xee9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <nameOnes+0xcf>
lea    0xedd(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <nameOnes+0xcf>
lea    0xed1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <nameOnes+0xcf>
lea    0xec7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <nameOnes+0xcf>
lea    0xebc(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <nameOnes+0xcf>
lea    0xeb1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <nameOnes+0xcf>
lea    0xea5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <nameOnes+0xcf>
lea    0xe9b(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <nameOnes+0xcf>
lea    0xe91(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cf <nameOnes+0xcf>
lea    0xe66(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<nameOnes>:
add    $0xffffffcf,%edi
cmp    $0x8,%edi
ja     111a <nameOnes+0x1a>
movslq %edi,%rax
lea    0xf1e(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xeec(%rip),%rax
ret

LLVM IR (-O0):
@.str = [4 x i8] c"one\00"
@.str.1 = [4 x i8] c"two\00"
@.str.2 = [6 x i8] c"three\00"
@.str.3 = [5 x i8] c"four\00"
@.str.4 = [5 x i8] c"five\00"
@.str.5 = [4 x i8] c"six\00"
@.str.6 = [6 x i8] c"seven\00"
@.str.7 = [6 x i8] c"eight\00"
@.str.8 = [5 x i8] c"nine\00"
@.str.9 = [1 x i8] zeroinitializer
define i8* @nameOnes(i8 signext %0) {
%2 = alloca i8*
%3 = alloca i8
store i8 %0, i8* %3
%4 = load i8, i8* %3
%5 = sext i8 %4 to i32
switch i32 %5, label %15 [
i32 49, label %6
i32 50, label %7
i32 51, label %8
i32 52, label %9
i32 53, label %10
i32 54, label %11
i32 55, label %12
i32 56, label %13
i32 57, label %14
]
6: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8** %2
br label %16
7: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %16
8: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %16
9: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %16
10: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %16
11: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %16
12: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %16
13: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %16
14: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %16
15: ; preds = %1
store i8* getelementptr inbounds ([1 x i8], [1 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 = [4 x i8] c"one\00"
@.str.1 = [4 x i8] c"two\00"
@.str.2 = [6 x i8] c"three\00"
@.str.3 = [5 x i8] c"four\00"
@.str.4 = [5 x i8] c"five\00"
@.str.5 = [4 x i8] c"six\00"
@.str.6 = [6 x i8] c"seven\00"
@.str.7 = [6 x i8] c"eight\00"
@.str.8 = [5 x i8] c"nine\00"
@.str.9 = [1 x i8] zeroinitializer
@reltable.nameOnes = [9 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str to i64), i64 ptrtoint ([9 x i32]* @reltable.nameOnes to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.1 to i64), i64 ptrtoint ([9 x i32]* @reltable.nameOnes to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.2 to i64), i64 ptrtoint ([9 x i32]* @reltable.nameOnes to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.3 to i64), i64 ptrtoint ([9 x i32]* @reltable.nameOnes to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.4 to i64), i64 ptrtoint ([9 x i32]* @reltable.nameOnes to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.5 to i64), i64 ptrtoint ([9 x i32]* @reltable.nameOnes to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.6 to i64), i64 ptrtoint ([9 x i32]* @reltable.nameOnes to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.7 to i64), i64 ptrtoint ([9 x i32]* @reltable.nameOnes to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.8 to i64), i64 ptrtoint ([9 x i32]* @reltable.nameOnes to i64)) to i32)]
define i8* @nameOnes(i8 signext %0) {
%2 = sext i8 %0 to i32
%3 = add nsw i32 %2, -49
%4 = icmp ult i32 %3, 9
br i1 %4, label %5, label %9
5: ; preds = %1
%6 = sext i32 %3 to i64
%7 = shl i64 %6, 2
%8 = call i8* @llvm.load.relative.i64(i8* bitcast ([9 x i32]* @reltable.nameOnes to i8*), i64 %7)
br label %9
9: ; preds = %1, %5
%10 = phi i8* [ %8, %5 ], [ getelementptr inbounds ([1 x i8], [1 x i8]* @.str.9, i64 0, i64 0), %1 ]
ret i8* %10
}