const char *GetRegionFromCode(const char regionCode) {
  switch (regionCode) {
  case 'C':
    return "CHN";
  case 'D':
    return "NOE";
  case 'E':
    return "USA";
  case 'F':
    return "FRA";
  case 'H':
    return "HOL";
  case 'I':
    return "ITA";
  case 'J':
    return "JPN";
  case 'K':
    return "KOR";
  case 'O':
    return "INT";
  case 'P':
    return "EUR";
  case 'R':
    return "RUS";
  case 'S':
    return "ESP";
  case 'U':
    return "AUS";
  case 'V':
    return "EUU";
  case 'W':
    return "EUU";
  case 'X':
    return "EUU";
  default:
    return "???";
  }
}


x86 assembly (clang, -O0):
<GetRegionFromCode>:
push   %rbp
mov    %rsp,%rbp
mov    %dil,%al
mov    %al,-0x9(%rbp)
movsbl -0x9(%rbp),%eax
add    $0xffffffbd,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x15,%eax
ja     1234 <GetRegionFromCode+0x134>
mov    -0x18(%rbp),%rax
lea    0xed5(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf1d(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123f <GetRegionFromCode+0x13f>
lea    0xf11(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123f <GetRegionFromCode+0x13f>
lea    0xf05(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123f <GetRegionFromCode+0x13f>
lea    0xef9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123f <GetRegionFromCode+0x13f>
lea    0xeed(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123f <GetRegionFromCode+0x13f>
lea    0xee1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123f <GetRegionFromCode+0x13f>
lea    0xed5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123f <GetRegionFromCode+0x13f>
lea    0xec9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123f <GetRegionFromCode+0x13f>
lea    0xebd(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123f <GetRegionFromCode+0x13f>
lea    0xeb1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123f <GetRegionFromCode+0x13f>
lea    0xea5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123f <GetRegionFromCode+0x13f>
lea    0xe99(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123f <GetRegionFromCode+0x13f>
lea    0xe8d(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123f <GetRegionFromCode+0x13f>
lea    0xe81(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123f <GetRegionFromCode+0x13f>
lea    0xe71(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123f <GetRegionFromCode+0x13f>
lea    0xe61(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    123f <GetRegionFromCode+0x13f>
lea    0xe55(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<GetRegionFromCode>:
add    $0xffffffbd,%edi
cmp    $0x15,%edi
ja     111a <GetRegionFromCode+0x1a>
movslq %edi,%rax
lea    0xf2a(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf17(%rip),%rax
ret

LLVM IR (-O0):
@.str = [4 x i8] c"CHN\00"
@.str.1 = [4 x i8] c"NOE\00"
@.str.2 = [4 x i8] c"USA\00"
@.str.3 = [4 x i8] c"FRA\00"
@.str.4 = [4 x i8] c"HOL\00"
@.str.5 = [4 x i8] c"ITA\00"
@.str.6 = [4 x i8] c"JPN\00"
@.str.7 = [4 x i8] c"KOR\00"
@.str.8 = [4 x i8] c"INT\00"
@.str.9 = [4 x i8] c"EUR\00"
@.str.10 = [4 x i8] c"RUS\00"
@.str.11 = [4 x i8] c"ESP\00"
@.str.12 = [4 x i8] c"AUS\00"
@.str.13 = [4 x i8] c"EUU\00"
@.str.14 = [4 x i8] c"???\00"
define i8* @GetRegionFromCode(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 %22 [
i32 67, label %6
i32 68, label %7
i32 69, label %8
i32 70, label %9
i32 72, label %10
i32 73, label %11
i32 74, label %12
i32 75, label %13
i32 79, label %14
i32 80, label %15
i32 82, label %16
i32 83, label %17
i32 85, label %18
i32 86, label %19
i32 87, label %20
i32 88, label %21
]
6: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8** %2
br label %23
7: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %23
8: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %23
9: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %23
10: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %23
11: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %23
12: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %23
13: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %23
14: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %23
15: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %23
16: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.10, i64 0, i64 0), i8** %2
br label %23
17: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %23
18: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.12, i64 0, i64 0), i8** %2
br label %23
19: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %23
20: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %23
21: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %23
22: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.14, i64 0, i64 0), i8** %2
br label %23
23: ; preds = %22, %21, %20, %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6
%24 = load i8*, i8** %2
ret i8* %24
}

LLVM IR (-O2):
@.str = [4 x i8] c"CHN\00"
@.str.1 = [4 x i8] c"NOE\00"
@.str.2 = [4 x i8] c"USA\00"
@.str.3 = [4 x i8] c"FRA\00"
@.str.4 = [4 x i8] c"HOL\00"
@.str.5 = [4 x i8] c"ITA\00"
@.str.6 = [4 x i8] c"JPN\00"
@.str.7 = [4 x i8] c"KOR\00"
@.str.8 = [4 x i8] c"INT\00"
@.str.9 = [4 x i8] c"EUR\00"
@.str.10 = [4 x i8] c"RUS\00"
@.str.11 = [4 x i8] c"ESP\00"
@.str.12 = [4 x i8] c"AUS\00"
@.str.13 = [4 x i8] c"EUU\00"
@.str.14 = [4 x i8] c"???\00"
@reltable.GetRegionFromCode = [22 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.1 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.2 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.3 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.14 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.4 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.5 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.6 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.7 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.14 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.14 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.14 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.8 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.9 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.14 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.10 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.11 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.14 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.12 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.13 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.13 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.13 to i64), i64 ptrtoint ([22 x i32]* @reltable.GetRegionFromCode to i64)) to i32)]
define i8* @GetRegionFromCode(i8 signext %0) {
%2 = sext i8 %0 to i32
%3 = add nsw i32 %2, -67
%4 = icmp ult i32 %3, 22
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 ([22 x i32]* @reltable.GetRegionFromCode to i8*), i64 %7)
br label %9
9: ; preds = %1, %5
%10 = phi i8* [ %8, %5 ], [ getelementptr inbounds ([4 x i8], [4 x i8]* @.str.14, i64 0, i64 0), %1 ]
ret i8* %10
}