char *btesh2_print_NameForDRegID(int id) {
  char *s;
  switch (id) {
  case 0:
    s = "DR0";
    break;
  case 1:
    s = "XD0";
    break;
  case 2:
    s = "DR2";
    break;
  case 3:
    s = "XD2";
    break;
  case 4:
    s = "DR4";
    break;
  case 5:
    s = "XD4";
    break;
  case 6:
    s = "DR6";
    break;
  case 7:
    s = "XD6";
    break;
  case 8:
    s = "DR8";
    break;
  case 9:
    s = "XD8";
    break;
  case 10:
    s = "DR10";
    break;
  case 11:
    s = "XD10";
    break;
  case 12:
    s = "DR12";
    break;
  case 13:
    s = "XD12";
    break;
  case 14:
    s = "DR14";
    break;
  case 15:
    s = "XD14";
    break;
  case 16:
    s = "XD0";
    break;
  case 18:
    s = "XD2";
    break;
  case 20:
    s = "XD4";
    break;
  case 22:
    s = "XD6";
    break;
  case 24:
    s = "XD8";
    break;
  case 26:
    s = "XD10";
    break;
  case 28:
    s = "XD12";
    break;
  case 30:
    s = "XD14";
    break;
  default:
    s = "?";
    break;
  }
  return (s);
}


x86 assembly (clang, -O0):
<btesh2_print_NameForDRegID>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0x4(%rbp)
mov    -0x4(%rbp),%eax
mov    %rax,-0x18(%rbp)
sub    $0x1e,%rax
ja     12ac <btesh2_print_NameForDRegID+0x1ac>
mov    -0x18(%rbp),%rax
lea    0xedd(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf49(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xf3d(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xf31(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xf25(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xf19(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xf0d(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xf01(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xef5(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xee9(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xedd(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xed1(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xec6(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xebb(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xeb0(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xea5(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xe9a(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xe4d(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xe45(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xe3d(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xe35(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xe2d(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xe26(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xe20(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xe1a(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b7 <btesh2_print_NameForDRegID+0x1b7>
lea    0xe0f(%rip),%rax
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<btesh2_print_NameForDRegID>:
cmp    $0x1e,%edi
ja     1117 <btesh2_print_NameForDRegID+0x17>
movslq %edi,%rax
lea    0xf39(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf28(%rip),%rax
ret

LLVM IR (-O0):
@.str = [4 x i8] c"DR0\00"
@.str.1 = [4 x i8] c"XD0\00"
@.str.2 = [4 x i8] c"DR2\00"
@.str.3 = [4 x i8] c"XD2\00"
@.str.4 = [4 x i8] c"DR4\00"
@.str.5 = [4 x i8] c"XD4\00"
@.str.6 = [4 x i8] c"DR6\00"
@.str.7 = [4 x i8] c"XD6\00"
@.str.8 = [4 x i8] c"DR8\00"
@.str.9 = [4 x i8] c"XD8\00"
@.str.10 = [5 x i8] c"DR10\00"
@.str.11 = [5 x i8] c"XD10\00"
@.str.12 = [5 x i8] c"DR12\00"
@.str.13 = [5 x i8] c"XD12\00"
@.str.14 = [5 x i8] c"DR14\00"
@.str.15 = [5 x i8] c"XD14\00"
@.str.16 = [2 x i8] c"?\00"
define i8* @btesh2_print_NameForDRegID(i32 %0) {
%2 = alloca i32
%3 = alloca i8*
store i32 %0, i32* %2
%4 = load i32, i32* %2
switch i32 %4, label %29 [
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
i32 16, label %21
i32 18, label %22
i32 20, label %23
i32 22, label %24
i32 24, label %25
i32 26, label %26
i32 28, label %27
i32 30, label %28
]
5: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8** %3
br label %30
6: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8** %3
br label %30
7: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i8** %3
br label %30
8: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i8** %3
br label %30
9: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0), i8** %3
br label %30
10: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.5, i64 0, i64 0), i8** %3
br label %30
11: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.6, i64 0, i64 0), i8** %3
br label %30
12: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.7, i64 0, i64 0), i8** %3
br label %30
13: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.8, i64 0, i64 0), i8** %3
br label %30
14: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.9, i64 0, i64 0), i8** %3
br label %30
15: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.10, i64 0, i64 0), i8** %3
br label %30
16: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.11, i64 0, i64 0), i8** %3
br label %30
17: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.12, i64 0, i64 0), i8** %3
br label %30
18: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.13, i64 0, i64 0), i8** %3
br label %30
19: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.14, i64 0, i64 0), i8** %3
br label %30
20: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.15, i64 0, i64 0), i8** %3
br label %30
21: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8** %3
br label %30
22: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i8** %3
br label %30
23: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.5, i64 0, i64 0), i8** %3
br label %30
24: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.7, i64 0, i64 0), i8** %3
br label %30
25: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.9, i64 0, i64 0), i8** %3
br label %30
26: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.11, i64 0, i64 0), i8** %3
br label %30
27: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.13, i64 0, i64 0), i8** %3
br label %30
28: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.15, i64 0, i64 0), i8** %3
br label %30
29: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.16, i64 0, i64 0), i8** %3
br label %30
30: ; preds = %29, %28, %27, %26, %25, %24, %23, %22, %21, %20, %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%31 = load i8*, i8** %3
ret i8* %31
}

LLVM IR (-O2):
@.str = [4 x i8] c"DR0\00"
@.str.1 = [4 x i8] c"XD0\00"
@.str.2 = [4 x i8] c"DR2\00"
@.str.3 = [4 x i8] c"XD2\00"
@.str.4 = [4 x i8] c"DR4\00"
@.str.5 = [4 x i8] c"XD4\00"
@.str.6 = [4 x i8] c"DR6\00"
@.str.7 = [4 x i8] c"XD6\00"
@.str.8 = [4 x i8] c"DR8\00"
@.str.9 = [4 x i8] c"XD8\00"
@.str.10 = [5 x i8] c"DR10\00"
@.str.11 = [5 x i8] c"XD10\00"
@.str.12 = [5 x i8] c"DR12\00"
@.str.13 = [5 x i8] c"XD12\00"
@.str.14 = [5 x i8] c"DR14\00"
@.str.15 = [5 x i8] c"XD14\00"
@.str.16 = [2 x i8] c"?\00"
@reltable.btesh2_print_NameForDRegID = [31 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.1 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.2 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.3 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.4 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.5 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.6 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.7 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.8 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.9 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.10 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.11 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.12 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.13 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.14 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.15 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.1 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.16 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.3 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.16 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.5 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.16 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.7 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.16 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.9 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.16 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.11 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.16 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.13 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.16 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.15 to i64), i64 ptrtoint ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i64)) to i32)]
define i8* @btesh2_print_NameForDRegID(i32 %0) {
%2 = icmp ult i32 %0, 31
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 ([31 x i32]* @reltable.btesh2_print_NameForDRegID to i8*), i64 %5)
br label %7
7: ; preds = %1, %3
%8 = phi i8* [ %6, %3 ], [ getelementptr inbounds ([2 x i8], [2 x i8]* @.str.16, i64 0, i64 0), %1 ]
ret i8* %8
}