const char *rcpPktType(unsigned type) {
  switch (type) {
  case 1:
    return "CLI";
  case 2:
    return "REGISTRATION";
  case 3:
    return "LOG";
  case 4:
    return "INTERFACE UP";
  case 5:
    return "INTERFACE DOWN";
  case 6:
    return "ADD ROUTE";
  case 7:
    return "DELETE ROUTE";
  case 8:
    return "UPDATE SYSTEM FILES";
  case 9:
    return "UPDATE DNS";
  case 10:
    return "INTERFACE ADDRESS CHANGED";
  case 11:
    return "LOOPBACK";
  case 14:
    return "VLAN_DELETED";
  case 12:
    return "ROUTE REQUEST";
  case 13:
    return "HTTP AUTHNETICATION";
  }
  return "UNKNOWN";
}


x86 assembly (clang, -O0):
<rcpPktType>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0xd,%eax
ja     1210 <rcpPktType+0x110>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf01(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <rcpPktType+0x11b>
lea    0xef5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <rcpPktType+0x11b>
lea    0xef2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <rcpPktType+0x11b>
lea    0xee6(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <rcpPktType+0x11b>
lea    0xee3(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <rcpPktType+0x11b>
lea    0xee2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <rcpPktType+0x11b>
lea    0xedc(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <rcpPktType+0x11b>
lea    0xed9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <rcpPktType+0x11b>
lea    0xedd(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <rcpPktType+0x11b>
lea    0xed8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <rcpPktType+0x11b>
lea    0xee2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <rcpPktType+0x11b>
lea    0xedb(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <rcpPktType+0x11b>
lea    0xed8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <rcpPktType+0x11b>
lea    0xed6(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <rcpPktType+0x11b>
lea    0xeda(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<rcpPktType>:
add    $0xffffffff,%edi
cmp    $0xd,%edi
ja     111a <rcpPktType+0x1a>
movslq %edi,%rax
lea    0xfb2(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf98(%rip),%rax
ret

LLVM IR (-O0):
@.str = [4 x i8] c"CLI\00"
@.str.1 = [13 x i8] c"REGISTRATION\00"
@.str.2 = [4 x i8] c"LOG\00"
@.str.3 = [13 x i8] c"INTERFACE UP\00"
@.str.4 = [15 x i8] c"INTERFACE DOWN\00"
@.str.5 = [10 x i8] c"ADD ROUTE\00"
@.str.6 = [13 x i8] c"DELETE ROUTE\00"
@.str.7 = [20 x i8] c"UPDATE SYSTEM FILES\00"
@.str.8 = [11 x i8] c"UPDATE DNS\00"
@.str.9 = [26 x i8] c"INTERFACE ADDRESS CHANGED\00"
@.str.10 = [9 x i8] c"LOOPBACK\00"
@.str.11 = [13 x i8] c"VLAN_DELETED\00"
@.str.12 = [14 x i8] c"ROUTE REQUEST\00"
@.str.13 = [20 x i8] c"HTTP AUTHNETICATION\00"
@.str.14 = [8 x i8] c"UNKNOWN\00"
define i8* @rcpPktType(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %19 [
i32 1, label %5
i32 2, label %6
i32 3, label %7
i32 4, label %8
i32 5, label %9
i32 6, label %10
i32 7, label %11
i32 8, label %12
i32 9, label %13
i32 10, label %14
i32 11, label %15
i32 14, label %16
i32 12, label %17
i32 13, label %18
]
5: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8** %2
br label %20
6: ; preds = %1
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %20
7: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %20
8: ; preds = %1
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %20
9: ; preds = %1
store i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %20
10: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %20
11: ; preds = %1
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %20
12: ; preds = %1
store i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %20
13: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %20
14: ; preds = %1
store i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %20
15: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.10, i64 0, i64 0), i8** %2
br label %20
16: ; preds = %1
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %20
17: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.12, i64 0, i64 0), i8** %2
br label %20
18: ; preds = %1
store i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %20
19: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.14, i64 0, i64 0), i8** %2
br label %20
20: ; preds = %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%21 = load i8*, i8** %2
ret i8* %21
}

LLVM IR (-O2):
@.str = [4 x i8] c"CLI\00"
@.str.1 = [13 x i8] c"REGISTRATION\00"
@.str.2 = [4 x i8] c"LOG\00"
@.str.3 = [13 x i8] c"INTERFACE UP\00"
@.str.4 = [15 x i8] c"INTERFACE DOWN\00"
@.str.5 = [10 x i8] c"ADD ROUTE\00"
@.str.6 = [13 x i8] c"DELETE ROUTE\00"
@.str.7 = [20 x i8] c"UPDATE SYSTEM FILES\00"
@.str.8 = [11 x i8] c"UPDATE DNS\00"
@.str.9 = [26 x i8] c"INTERFACE ADDRESS CHANGED\00"
@.str.10 = [9 x i8] c"LOOPBACK\00"
@.str.11 = [13 x i8] c"VLAN_DELETED\00"
@.str.12 = [14 x i8] c"ROUTE REQUEST\00"
@.str.13 = [20 x i8] c"HTTP AUTHNETICATION\00"
@.str.14 = [8 x i8] c"UNKNOWN\00"
@reltable.rcpPktType = [14 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str to i64), i64 ptrtoint ([14 x i32]* @reltable.rcpPktType to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([13 x i8]* @.str.1 to i64), i64 ptrtoint ([14 x i32]* @reltable.rcpPktType to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.2 to i64), i64 ptrtoint ([14 x i32]* @reltable.rcpPktType to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([13 x i8]* @.str.3 to i64), i64 ptrtoint ([14 x i32]* @reltable.rcpPktType to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([15 x i8]* @.str.4 to i64), i64 ptrtoint ([14 x i32]* @reltable.rcpPktType to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.5 to i64), i64 ptrtoint ([14 x i32]* @reltable.rcpPktType to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([13 x i8]* @.str.6 to i64), i64 ptrtoint ([14 x i32]* @reltable.rcpPktType to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([20 x i8]* @.str.7 to i64), i64 ptrtoint ([14 x i32]* @reltable.rcpPktType to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([11 x i8]* @.str.8 to i64), i64 ptrtoint ([14 x i32]* @reltable.rcpPktType to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([26 x i8]* @.str.9 to i64), i64 ptrtoint ([14 x i32]* @reltable.rcpPktType to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([9 x i8]* @.str.10 to i64), i64 ptrtoint ([14 x i32]* @reltable.rcpPktType to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.12 to i64), i64 ptrtoint ([14 x i32]* @reltable.rcpPktType to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([20 x i8]* @.str.13 to i64), i64 ptrtoint ([14 x i32]* @reltable.rcpPktType to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([13 x i8]* @.str.11 to i64), i64 ptrtoint ([14 x i32]* @reltable.rcpPktType to i64)) to i32)]
define i8* @rcpPktType(i32 %0) {
%2 = add i32 %0, -1
%3 = icmp ult i32 %2, 14
br i1 %3, label %4, label %8
4: ; preds = %1
%5 = sext i32 %2 to i64
%6 = shl i64 %5, 2
%7 = call i8* @llvm.load.relative.i64(i8* bitcast ([14 x i32]* @reltable.rcpPktType to i8*), i64 %6)
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ getelementptr inbounds ([8 x i8], [8 x i8]* @.str.14, i64 0, i64 0), %1 ]
ret i8* %9
}