const char *c2TYPE(int c) {
  const char *value;
  switch (c) {
  case 'b':
    value = "BOOL";
    break;
  case 'e':
    value = "ENUM";
    break;
  case 'i':
    value = "INT";
    break;
  case 's':
    value = "STRING";
    break;
  case 'x':
    value = "REGEX";
    break;
  default:
    value = "?";
  }
  return value;
}


x86 assembly (clang, -O0):
<c2TYPE>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0xffffff9e,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x16,%eax
ja     1180 <c2TYPE+0x80>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf25(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    118b <c2TYPE+0x8b>
lea    0xf1a(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    118b <c2TYPE+0x8b>
lea    0xf0f(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    118b <c2TYPE+0x8b>
lea    0xf03(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    118b <c2TYPE+0x8b>
lea    0xefa(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    118b <c2TYPE+0x8b>
lea    0xef0(%rip),%rax
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<c2TYPE>:
add    $0xffffff9e,%edi
cmp    $0x16,%edi
ja     1127 <c2TYPE+0x27>
lea    0xf4d(%rip),%rax
lea    0xeea(%rip),%rcx
movslq (%rcx,%rdi,4),%rdx
add    %rcx,%rdx
jmp    *%rdx
lea    0xf3b(%rip),%rax
ret
lea    0xf49(%rip),%rax
ret
lea    0xf30(%rip),%rax
ret
lea    0xf2c(%rip),%rax
ret
lea    0xf2b(%rip),%rax
ret

LLVM IR (-O0):
@.str = [5 x i8] c"BOOL\00"
@.str.1 = [5 x i8] c"ENUM\00"
@.str.2 = [4 x i8] c"INT\00"
@.str.3 = [7 x i8] c"STRING\00"
@.str.4 = [6 x i8] c"REGEX\00"
@.str.5 = [2 x i8] c"?\00"
define i8* @c2TYPE(i32 %0) {
%2 = alloca i32
%3 = alloca i8*
store i32 %0, i32* %2
%4 = load i32, i32* %2
switch i32 %4, label %10 [
i32 98, label %5
i32 101, label %6
i32 105, label %7
i32 115, label %8
i32 120, label %9
]
5: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8** %3
br label %11
6: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i8** %3
br label %11
7: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i8** %3
br label %11
8: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.3, i64 0, i64 0), i8** %3
br label %11
9: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.4, i64 0, i64 0), i8** %3
br label %11
10: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.5, i64 0, i64 0), i8** %3
br label %11
11: ; preds = %10, %9, %8, %7, %6, %5
%12 = load i8*, i8** %3
ret i8* %12
}

LLVM IR (-O2):
@.str = [5 x i8] c"BOOL\00"
@.str.1 = [5 x i8] c"ENUM\00"
@.str.2 = [4 x i8] c"INT\00"
@.str.3 = [7 x i8] c"STRING\00"
@.str.4 = [6 x i8] c"REGEX\00"
@.str.5 = [2 x i8] c"?\00"
define i8* @c2TYPE(i32 %0) {
switch i32 %0, label %6 [
i32 98, label %7
i32 101, label %2
i32 105, label %3
i32 115, label %4
i32 120, label %5
]
2: ; preds = %1
br label %7
3: ; preds = %1
br label %7
4: ; preds = %1
br label %7
5: ; preds = %1
br label %7
6: ; preds = %1
br label %7
7: ; preds = %1, %6, %5, %4, %3, %2
%8 = phi i8* [ getelementptr inbounds ([2 x i8], [2 x i8]* @.str.5, i64 0, i64 0), %6 ], [ getelementptr inbounds ([6 x i8], [6 x i8]* @.str.4, i64 0, i64 0), %5 ], [ getelementptr inbounds ([7 x i8], [7 x i8]* @.str.3, i64 0, i64 0), %4 ], [ getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), %3 ], [ getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), %2 ], [ getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), %1 ]
ret i8* %8
}