const char *wpa_alg_txt(int alg) {
  switch (alg) {
  case (1 << (4)):
    return "CCMP";
  case (1 << (3)):
    return "TKIP";
  case (1 << (2)):
  case (1 << (1)):
    return "WEP";
  default:
    return "";
  }
}


x86 assembly (clang, -O0):
<wpa_alg_txt>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0xfffffffe,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0xe,%eax
ja     1160 <wpa_alg_txt+0x60>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf05(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    116b <wpa_alg_txt+0x6b>
lea    0xefa(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    116b <wpa_alg_txt+0x6b>
lea    0xeef(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    116b <wpa_alg_txt+0x6b>
lea    0xee2(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<wpa_alg_txt>:
add    $0xfffffffe,%edi
ror    %edi
cmp    $0x7,%edi
ja     111c <wpa_alg_txt+0x1c>
movslq %edi,%rax
lea    0xefc(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xeea(%rip),%rax
ret

LLVM IR (-O0):
@.str = [5 x i8] c"CCMP\00"
@.str.1 = [5 x i8] c"TKIP\00"
@.str.2 = [4 x i8] c"WEP\00"
@.str.3 = [1 x i8] zeroinitializer
define i8* @wpa_alg_txt(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %8 [
i32 16, label %5
i32 8, label %6
i32 4, label %7
i32 2, label %7
]
5: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8** %2
br label %9
6: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %9
7: ; preds = %1, %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %9
8: ; preds = %1
store i8* getelementptr inbounds ([1 x i8], [1 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %9
9: ; preds = %8, %7, %6, %5
%10 = load i8*, i8** %2
ret i8* %10
}

LLVM IR (-O2):
@.str = [5 x i8] c"CCMP\00"
@.str.1 = [5 x i8] c"TKIP\00"
@.str.2 = [4 x i8] c"WEP\00"
@.str.3 = [1 x i8] zeroinitializer
@reltable.wpa_alg_txt = [8 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.2 to i64), i64 ptrtoint ([8 x i32]* @reltable.wpa_alg_txt to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.2 to i64), i64 ptrtoint ([8 x i32]* @reltable.wpa_alg_txt to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([1 x i8]* @.str.3 to i64), i64 ptrtoint ([8 x i32]* @reltable.wpa_alg_txt to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.1 to i64), i64 ptrtoint ([8 x i32]* @reltable.wpa_alg_txt to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([1 x i8]* @.str.3 to i64), i64 ptrtoint ([8 x i32]* @reltable.wpa_alg_txt to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([1 x i8]* @.str.3 to i64), i64 ptrtoint ([8 x i32]* @reltable.wpa_alg_txt to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([1 x i8]* @.str.3 to i64), i64 ptrtoint ([8 x i32]* @reltable.wpa_alg_txt to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str to i64), i64 ptrtoint ([8 x i32]* @reltable.wpa_alg_txt to i64)) to i32)]
define i8* @wpa_alg_txt(i32 %0) {
%2 = add i32 %0, -2
%3 = tail call i32 @llvm.fshl.i32(i32 %2, i32 %2, i32 31)
%4 = icmp ult i32 %3, 8
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 ([8 x i32]* @reltable.wpa_alg_txt to i8*), i64 %7)
br label %9
9: ; preds = %1, %5
%10 = phi i8* [ %8, %5 ], [ getelementptr inbounds ([1 x i8], [1 x i8]* @.str.3, i64 0, i64 0), %1 ]
ret i8* %10
}