const char *state2str(unsigned state) {
  switch (state) {
  case 0x1:
    return "ESTABLISHED";
  case 0x2:
    return "SYN_SENT";
  case 0x3:
    return "SYN_RECV";
  case 0x4:
    return "FIN_WAIT1";
  case 0x5:
    return "FIN_WAIT2";
  case 0x6:
    return "TIME_WAIT";
  case 0x7:
    return "CLOSE";
  case 0x8:
    return "CLOSE_WAIT";
  case 0x9:
    return "LAST_ACK";
  case 0xA:
    return "LISTEN";
  case 0xB:
    return "CLOSING";
  default:
    return "UNKNOWN";
  }
}


x86 assembly (clang, -O0):
<state2str>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0xa,%eax
ja     11e0 <state2str+0xe0>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xef5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <state2str+0xeb>
lea    0xef1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <state2str+0xeb>
lea    0xeea(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <state2str+0xeb>
lea    0xee3(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <state2str+0xeb>
lea    0xedd(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <state2str+0xeb>
lea    0xed7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <state2str+0xeb>
lea    0xed1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <state2str+0xeb>
lea    0xec7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <state2str+0xeb>
lea    0xec2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <state2str+0xeb>
lea    0xebb(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <state2str+0xeb>
lea    0xeb2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <state2str+0xeb>
lea    0xeaa(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<state2str>:
add    $0xffffffff,%edi
cmp    $0xa,%edi
ja     111a <state2str+0x1a>
movslq %edi,%rax
lea    0xf5e(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf44(%rip),%rax
ret

LLVM IR (-O0):
@.str = [12 x i8] c"ESTABLISHED\00"
@.str.1 = [9 x i8] c"SYN_SENT\00"
@.str.2 = [9 x i8] c"SYN_RECV\00"
@.str.3 = [10 x i8] c"FIN_WAIT1\00"
@.str.4 = [10 x i8] c"FIN_WAIT2\00"
@.str.5 = [10 x i8] c"TIME_WAIT\00"
@.str.6 = [6 x i8] c"CLOSE\00"
@.str.7 = [11 x i8] c"CLOSE_WAIT\00"
@.str.8 = [9 x i8] c"LAST_ACK\00"
@.str.9 = [7 x i8] c"LISTEN\00"
@.str.10 = [8 x i8] c"CLOSING\00"
@.str.11 = [8 x i8] c"UNKNOWN\00"
define i8* @state2str(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %16 [
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
]
5: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0), i8** %2
br label %17
6: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %17
7: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %17
8: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %17
9: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %17
10: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %17
11: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %17
12: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %17
13: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %17
14: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %17
15: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.10, i64 0, i64 0), i8** %2
br label %17
16: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %17
17: ; preds = %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%18 = load i8*, i8** %2
ret i8* %18
}

LLVM IR (-O2):
@.str = [12 x i8] c"ESTABLISHED\00"
@.str.1 = [9 x i8] c"SYN_SENT\00"
@.str.2 = [9 x i8] c"SYN_RECV\00"
@.str.3 = [10 x i8] c"FIN_WAIT1\00"
@.str.4 = [10 x i8] c"FIN_WAIT2\00"
@.str.5 = [10 x i8] c"TIME_WAIT\00"
@.str.6 = [6 x i8] c"CLOSE\00"
@.str.7 = [11 x i8] c"CLOSE_WAIT\00"
@.str.8 = [9 x i8] c"LAST_ACK\00"
@.str.9 = [7 x i8] c"LISTEN\00"
@.str.10 = [8 x i8] c"CLOSING\00"
@.str.11 = [8 x i8] c"UNKNOWN\00"
@reltable.state2str = [11 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([12 x i8]* @.str to i64), i64 ptrtoint ([11 x i32]* @reltable.state2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([9 x i8]* @.str.1 to i64), i64 ptrtoint ([11 x i32]* @reltable.state2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([9 x i8]* @.str.2 to i64), i64 ptrtoint ([11 x i32]* @reltable.state2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.3 to i64), i64 ptrtoint ([11 x i32]* @reltable.state2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.4 to i64), i64 ptrtoint ([11 x i32]* @reltable.state2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.5 to i64), i64 ptrtoint ([11 x i32]* @reltable.state2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.6 to i64), i64 ptrtoint ([11 x i32]* @reltable.state2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([11 x i8]* @.str.7 to i64), i64 ptrtoint ([11 x i32]* @reltable.state2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([9 x i8]* @.str.8 to i64), i64 ptrtoint ([11 x i32]* @reltable.state2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.9 to i64), i64 ptrtoint ([11 x i32]* @reltable.state2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.10 to i64), i64 ptrtoint ([11 x i32]* @reltable.state2str to i64)) to i32)]
define i8* @state2str(i32 %0) {
%2 = add i32 %0, -1
%3 = icmp ult i32 %2, 11
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 ([11 x i32]* @reltable.state2str 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.11, i64 0, i64 0), %1 ]
ret i8* %9
}