const char *GetExifTypeName(unsigned short exifType) {
  switch (exifType) {
  case 1:
    return "BYTE";
  case 2:
    return "ASCII";
  case 3:
    return "SHORT";
  case 4:
    return "LONG";
  case 5:
    return "RATIONAL";
  case 7:
    return "UNDEFINED";
  case 9:
    return "SLONG";
  case 10:
    return "SRATIONAL";
  default:
    return "";
  }
}


x86 assembly (clang, -O0):
<GetExifTypeName>:
push   %rbp
mov    %rsp,%rbp
mov    %di,%ax
mov    %ax,-0xa(%rbp)
movzwl -0xa(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x9,%eax
ja     11b5 <GetExifTypeName+0xb5>
mov    -0x18(%rbp),%rax
lea    0xed4(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xeec(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11c0 <GetExifTypeName+0xc0>
lea    0xee1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11c0 <GetExifTypeName+0xc0>
lea    0xed7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11c0 <GetExifTypeName+0xc0>
lea    0xed8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11c0 <GetExifTypeName+0xc0>
lea    0xece(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11c0 <GetExifTypeName+0xc0>
lea    0xead(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11c0 <GetExifTypeName+0xc0>
lea    0xea7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11c0 <GetExifTypeName+0xc0>
lea    0xe9d(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11c0 <GetExifTypeName+0xc0>
lea    0xe86(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<GetExifTypeName>:
add    $0xffffffff,%edi
cmp    $0x9,%di
ja     111c <GetExifTypeName+0x1c>
movswq %di,%rax
lea    0xf18(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xef7(%rip),%rax
ret

LLVM IR (-O0):
@.str = [5 x i8] c"BYTE\00"
@.str.1 = [6 x i8] c"ASCII\00"
@.str.2 = [6 x i8] c"SHORT\00"
@.str.3 = [5 x i8] c"LONG\00"
@.str.4 = [9 x i8] c"RATIONAL\00"
@.str.5 = [10 x i8] c"UNDEFINED\00"
@.str.6 = [6 x i8] c"SLONG\00"
@.str.7 = [10 x i8] c"SRATIONAL\00"
@.str.8 = [1 x i8] zeroinitializer
define i8* @GetExifTypeName(i16 zeroext %0) {
%2 = alloca i8*
%3 = alloca i16
store i16 %0, i16* %3
%4 = load i16, i16* %3
%5 = zext i16 %4 to i32
switch i32 %5, label %14 [
i32 1, label %6
i32 2, label %7
i32 3, label %8
i32 4, label %9
i32 5, label %10
i32 7, label %11
i32 9, label %12
i32 10, label %13
]
6: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8** %2
br label %15
7: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %15
8: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %15
9: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %15
10: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %15
11: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %15
12: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %15
13: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %15
14: ; preds = %1
store i8* getelementptr inbounds ([1 x i8], [1 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %15
15: ; preds = %14, %13, %12, %11, %10, %9, %8, %7, %6
%16 = load i8*, i8** %2
ret i8* %16
}

LLVM IR (-O2):
@.str = [5 x i8] c"BYTE\00"
@.str.1 = [6 x i8] c"ASCII\00"
@.str.2 = [6 x i8] c"SHORT\00"
@.str.3 = [5 x i8] c"LONG\00"
@.str.4 = [9 x i8] c"RATIONAL\00"
@.str.5 = [10 x i8] c"UNDEFINED\00"
@.str.6 = [6 x i8] c"SLONG\00"
@.str.7 = [10 x i8] c"SRATIONAL\00"
@.str.8 = [1 x i8] zeroinitializer
@reltable.GetExifTypeName = [10 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str to i64), i64 ptrtoint ([10 x i32]* @reltable.GetExifTypeName to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.1 to i64), i64 ptrtoint ([10 x i32]* @reltable.GetExifTypeName to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.2 to i64), i64 ptrtoint ([10 x i32]* @reltable.GetExifTypeName to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.3 to i64), i64 ptrtoint ([10 x i32]* @reltable.GetExifTypeName to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([9 x i8]* @.str.4 to i64), i64 ptrtoint ([10 x i32]* @reltable.GetExifTypeName to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([1 x i8]* @.str.8 to i64), i64 ptrtoint ([10 x i32]* @reltable.GetExifTypeName to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.5 to i64), i64 ptrtoint ([10 x i32]* @reltable.GetExifTypeName to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([1 x i8]* @.str.8 to i64), i64 ptrtoint ([10 x i32]* @reltable.GetExifTypeName to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.6 to i64), i64 ptrtoint ([10 x i32]* @reltable.GetExifTypeName to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.7 to i64), i64 ptrtoint ([10 x i32]* @reltable.GetExifTypeName to i64)) to i32)]
define i8* @GetExifTypeName(i16 zeroext %0) {
%2 = add i16 %0, -1
%3 = icmp ult i16 %2, 10
br i1 %3, label %4, label %8
4: ; preds = %1
%5 = sext i16 %2 to i64
%6 = shl i64 %5, 2
%7 = call i8* @llvm.load.relative.i64(i8* bitcast ([10 x i32]* @reltable.GetExifTypeName to i8*), i64 %6)
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ getelementptr inbounds ([1 x i8], [1 x i8]* @.str.8, i64 0, i64 0), %1 ]
ret i8* %9
}