char *prefix2mask(int idx) {
  char *mask;
  switch (idx) {
  case 0:
    mask = "0.0.0.0";
    break;
  case 1:
    mask = "128.0.0.0";
    break;
  case 2:
    mask = "192.0.0.0";
    break;
  case 3:
    mask = "224.0.0.0";
    break;
  case 4:
    mask = "240.0.0.0";
    break;
  case 5:
    mask = "248.0.0.0";
    break;
  case 6:
    mask = "252.0.0.0";
    break;
  case 7:
    mask = "254.0.0.0";
    break;
  case 8:
    mask = "255.0.0.0";
    break;
  case 9:
    mask = "255.128.0.0";
    break;
  case 10:
    mask = "255.192.0.0";
    break;
  case 11:
    mask = "255.224.0.0";
    break;
  case 12:
    mask = "255.240.0.0";
    break;
  case 13:
    mask = "255.248.0.0";
    break;
  case 14:
    mask = "255.252.0.0";
    break;
  case 15:
    mask = "255.254.0.0";
    break;
  case 16:
    mask = "255.255.0.0";
    break;
  case 17:
    mask = "255.255.128.0";
    break;
  case 18:
    mask = "255.255.192.0";
    break;
  case 19:
    mask = "255.255.224.0";
    break;
  case 20:
    mask = "255.255.240.0";
    break;
  case 21:
    mask = "255.255.248.0";
    break;
  case 22:
    mask = "255.255.252.0";
    break;
  case 23:
    mask = "255.255.254.0";
    break;
  case 24:
    mask = "255.255.255.0";
    break;
  case 25:
    mask = "255.255.255.128";
    break;
  case 26:
    mask = "255.255.255.192";
    break;
  case 27:
    mask = "255.255.255.224";
    break;
  case 28:
    mask = "255.255.255.240";
    break;
  case 29:
    mask = "255.255.255.248";
    break;
  case 30:
    mask = "255.255.255.252";
    break;
  case 31:
    mask = "255.255.255.254";
    break;
  case 32:
    mask = "255.255.255.255";
    break;
  default:
    mask = "";
  }
  return mask;
}


x86 assembly (clang, -O0):
<prefix2mask>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0x4(%rbp)
mov    -0x4(%rbp),%eax
mov    %rax,-0x18(%rbp)
sub    $0x20,%rax
ja     133c <prefix2mask+0x23c>
mov    -0x18(%rbp),%rax
lea    0xedd(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf71(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xf41(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xf3b(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xf35(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xf2f(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xf29(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xf23(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xf1d(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xf17(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xf11(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xf0d(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xf09(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xf05(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xf01(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xefd(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xef9(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xef5(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xef1(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xeef(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xeed(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xeeb(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xee9(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xee7(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xee5(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xee3(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xee1(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xee1(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xee1(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xee1(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xee1(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xee1(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xee1(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xee1(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1347 <prefix2mask+0x247>
lea    0xd68(%rip),%rax
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<prefix2mask>:
cmp    $0x20,%edi
ja     1117 <prefix2mask+0x17>
movslq %edi,%rax
lea    0x1091(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf09(%rip),%rax
ret

LLVM IR (-O0):
@.str = [8 x i8] c"0.0.0.0\00"
@.str.1 = [10 x i8] c"128.0.0.0\00"
@.str.2 = [10 x i8] c"192.0.0.0\00"
@.str.3 = [10 x i8] c"224.0.0.0\00"
@.str.4 = [10 x i8] c"240.0.0.0\00"
@.str.5 = [10 x i8] c"248.0.0.0\00"
@.str.6 = [10 x i8] c"252.0.0.0\00"
@.str.7 = [10 x i8] c"254.0.0.0\00"
@.str.8 = [10 x i8] c"255.0.0.0\00"
@.str.9 = [12 x i8] c"255.128.0.0\00"
@.str.10 = [12 x i8] c"255.192.0.0\00"
@.str.11 = [12 x i8] c"255.224.0.0\00"
@.str.12 = [12 x i8] c"255.240.0.0\00"
@.str.13 = [12 x i8] c"255.248.0.0\00"
@.str.14 = [12 x i8] c"255.252.0.0\00"
@.str.15 = [12 x i8] c"255.254.0.0\00"
@.str.16 = [12 x i8] c"255.255.0.0\00"
@.str.17 = [14 x i8] c"255.255.128.0\00"
@.str.18 = [14 x i8] c"255.255.192.0\00"
@.str.19 = [14 x i8] c"255.255.224.0\00"
@.str.20 = [14 x i8] c"255.255.240.0\00"
@.str.21 = [14 x i8] c"255.255.248.0\00"
@.str.22 = [14 x i8] c"255.255.252.0\00"
@.str.23 = [14 x i8] c"255.255.254.0\00"
@.str.24 = [14 x i8] c"255.255.255.0\00"
@.str.25 = [16 x i8] c"255.255.255.128\00"
@.str.26 = [16 x i8] c"255.255.255.192\00"
@.str.27 = [16 x i8] c"255.255.255.224\00"
@.str.28 = [16 x i8] c"255.255.255.240\00"
@.str.29 = [16 x i8] c"255.255.255.248\00"
@.str.30 = [16 x i8] c"255.255.255.252\00"
@.str.31 = [16 x i8] c"255.255.255.254\00"
@.str.32 = [16 x i8] c"255.255.255.255\00"
@.str.33 = [1 x i8] zeroinitializer
define i8* @prefix2mask(i32 %0) {
%2 = alloca i32
%3 = alloca i8*
store i32 %0, i32* %2
%4 = load i32, i32* %2
switch i32 %4, label %38 [
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 17, label %22
i32 18, label %23
i32 19, label %24
i32 20, label %25
i32 21, label %26
i32 22, label %27
i32 23, label %28
i32 24, label %29
i32 25, label %30
i32 26, label %31
i32 27, label %32
i32 28, label %33
i32 29, label %34
i32 30, label %35
i32 31, label %36
i32 32, label %37
]
5: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), i8** %3
br label %39
6: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0), i8** %3
br label %39
7: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.2, i64 0, i64 0), i8** %3
br label %39
8: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.3, i64 0, i64 0), i8** %3
br label %39
9: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.4, i64 0, i64 0), i8** %3
br label %39
10: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.5, i64 0, i64 0), i8** %3
br label %39
11: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.6, i64 0, i64 0), i8** %3
br label %39
12: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.7, i64 0, i64 0), i8** %3
br label %39
13: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.8, i64 0, i64 0), i8** %3
br label %39
14: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.9, i64 0, i64 0), i8** %3
br label %39
15: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.10, i64 0, i64 0), i8** %3
br label %39
16: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.11, i64 0, i64 0), i8** %3
br label %39
17: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.12, i64 0, i64 0), i8** %3
br label %39
18: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.13, i64 0, i64 0), i8** %3
br label %39
19: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.14, i64 0, i64 0), i8** %3
br label %39
20: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.15, i64 0, i64 0), i8** %3
br label %39
21: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.16, i64 0, i64 0), i8** %3
br label %39
22: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.17, i64 0, i64 0), i8** %3
br label %39
23: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.18, i64 0, i64 0), i8** %3
br label %39
24: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.19, i64 0, i64 0), i8** %3
br label %39
25: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.20, i64 0, i64 0), i8** %3
br label %39
26: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.21, i64 0, i64 0), i8** %3
br label %39
27: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.22, i64 0, i64 0), i8** %3
br label %39
28: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.23, i64 0, i64 0), i8** %3
br label %39
29: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.24, i64 0, i64 0), i8** %3
br label %39
30: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.25, i64 0, i64 0), i8** %3
br label %39
31: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.26, i64 0, i64 0), i8** %3
br label %39
32: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.27, i64 0, i64 0), i8** %3
br label %39
33: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.28, i64 0, i64 0), i8** %3
br label %39
34: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.29, i64 0, i64 0), i8** %3
br label %39
35: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.30, i64 0, i64 0), i8** %3
br label %39
36: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.31, i64 0, i64 0), i8** %3
br label %39
37: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.32, i64 0, i64 0), i8** %3
br label %39
38: ; preds = %1
store i8* getelementptr inbounds ([1 x i8], [1 x i8]* @.str.33, i64 0, i64 0), i8** %3
br label %39
39: ; preds = %38, %37, %36, %35, %34, %33, %32, %31, %30, %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
%40 = load i8*, i8** %3
ret i8* %40
}

LLVM IR (-O2):
@.str = [8 x i8] c"0.0.0.0\00"
@.str.1 = [10 x i8] c"128.0.0.0\00"
@.str.2 = [10 x i8] c"192.0.0.0\00"
@.str.3 = [10 x i8] c"224.0.0.0\00"
@.str.4 = [10 x i8] c"240.0.0.0\00"
@.str.5 = [10 x i8] c"248.0.0.0\00"
@.str.6 = [10 x i8] c"252.0.0.0\00"
@.str.7 = [10 x i8] c"254.0.0.0\00"
@.str.8 = [10 x i8] c"255.0.0.0\00"
@.str.9 = [12 x i8] c"255.128.0.0\00"
@.str.10 = [12 x i8] c"255.192.0.0\00"
@.str.11 = [12 x i8] c"255.224.0.0\00"
@.str.12 = [12 x i8] c"255.240.0.0\00"
@.str.13 = [12 x i8] c"255.248.0.0\00"
@.str.14 = [12 x i8] c"255.252.0.0\00"
@.str.15 = [12 x i8] c"255.254.0.0\00"
@.str.16 = [12 x i8] c"255.255.0.0\00"
@.str.17 = [14 x i8] c"255.255.128.0\00"
@.str.18 = [14 x i8] c"255.255.192.0\00"
@.str.19 = [14 x i8] c"255.255.224.0\00"
@.str.20 = [14 x i8] c"255.255.240.0\00"
@.str.21 = [14 x i8] c"255.255.248.0\00"
@.str.22 = [14 x i8] c"255.255.252.0\00"
@.str.23 = [14 x i8] c"255.255.254.0\00"
@.str.24 = [14 x i8] c"255.255.255.0\00"
@.str.25 = [16 x i8] c"255.255.255.128\00"
@.str.26 = [16 x i8] c"255.255.255.192\00"
@.str.27 = [16 x i8] c"255.255.255.224\00"
@.str.28 = [16 x i8] c"255.255.255.240\00"
@.str.29 = [16 x i8] c"255.255.255.248\00"
@.str.30 = [16 x i8] c"255.255.255.252\00"
@.str.31 = [16 x i8] c"255.255.255.254\00"
@.str.32 = [16 x i8] c"255.255.255.255\00"
@.str.33 = [1 x i8] zeroinitializer
@reltable.prefix2mask = [33 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.1 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.2 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.3 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.4 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.5 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.6 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.7 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.8 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([12 x i8]* @.str.9 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([12 x i8]* @.str.10 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([12 x i8]* @.str.11 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([12 x i8]* @.str.12 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([12 x i8]* @.str.13 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([12 x i8]* @.str.14 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([12 x i8]* @.str.15 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([12 x i8]* @.str.16 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.17 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.18 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.19 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.20 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.21 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.22 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.23 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.24 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.25 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.26 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.27 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.28 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.29 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.30 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.31 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.32 to i64), i64 ptrtoint ([33 x i32]* @reltable.prefix2mask to i64)) to i32)]
define i8* @prefix2mask(i32 %0) {
%2 = icmp ult i32 %0, 33
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 ([33 x i32]* @reltable.prefix2mask to i8*), i64 %5)
br label %7
7: ; preds = %1, %3
%8 = phi i8* [ %6, %3 ], [ getelementptr inbounds ([1 x i8], [1 x i8]* @.str.33, i64 0, i64 0), %1 ]
ret i8* %8
}