#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */
typedef int uint16_t;

/* Variables and functions */
#define ns_c_2 133
#define ns_c_any 132
#define ns_c_chaos 131
#define ns_c_hs 130
#define ns_c_in 129
#define ns_c_none 128
const char *dns_class_string(uint16_t c) {
  switch (c) {
  case ns_c_in:
    return "IN";
  case ns_c_2:
    return "CS";
  case ns_c_chaos:
    return "CH";
  case ns_c_hs:
    return "HS";
  case ns_c_none:
    return "NONE";
  case ns_c_any:
    return "ANY";
  default:
    return "??";
  }
  return "??";
}


x86 assembly (clang, -O0):
<dns_class_string>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0xffffff80,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x5,%eax
ja     1190 <dns_class_string+0x90>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xee1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    119b <dns_class_string+0x9b>
lea    0xed4(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    119b <dns_class_string+0x9b>
lea    0xec7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    119b <dns_class_string+0x9b>
lea    0xeba(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    119b <dns_class_string+0x9b>
lea    0xead(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    119b <dns_class_string+0x9b>
lea    0xea2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    119b <dns_class_string+0x9b>
lea    0xe96(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<dns_class_string>:
add    $0xffffff80,%edi
cmp    $0x5,%edi
ja     111a <dns_class_string+0x1a>
movslq %edi,%rax
lea    0xf06(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xef4(%rip),%rax
ret

LLVM IR (-O0):
@.str = [3 x i8] c"IN\00"
@.str.1 = [3 x i8] c"CS\00"
@.str.2 = [3 x i8] c"CH\00"
@.str.3 = [3 x i8] c"HS\00"
@.str.4 = [5 x i8] c"NONE\00"
@.str.5 = [4 x i8] c"ANY\00"
@.str.6 = [3 x i8] c"??\00"
define i8* @dns_class_string(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %11 [
i32 129, label %5
i32 133, label %6
i32 131, label %7
i32 130, label %8
i32 128, label %9
i32 132, label %10
]
5: ; preds = %1
store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i8** %2
br label %12
6: ; preds = %1
store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %12
7: ; preds = %1
store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %12
8: ; preds = %1
store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %12
9: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %12
10: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %12
11: ; preds = %1
store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %12
12: ; preds = %11, %10, %9, %8, %7, %6, %5
%13 = load i8*, i8** %2
ret i8* %13
}

LLVM IR (-O2):
@.str = [3 x i8] c"IN\00"
@.str.1 = [3 x i8] c"CS\00"
@.str.2 = [3 x i8] c"CH\00"
@.str.3 = [3 x i8] c"HS\00"
@.str.4 = [5 x i8] c"NONE\00"
@.str.5 = [4 x i8] c"ANY\00"
@.str.6 = [3 x i8] c"??\00"
@reltable.dns_class_string = [6 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.4 to i64), i64 ptrtoint ([6 x i32]* @reltable.dns_class_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([3 x i8]* @.str to i64), i64 ptrtoint ([6 x i32]* @reltable.dns_class_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([3 x i8]* @.str.3 to i64), i64 ptrtoint ([6 x i32]* @reltable.dns_class_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([3 x i8]* @.str.2 to i64), i64 ptrtoint ([6 x i32]* @reltable.dns_class_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.5 to i64), i64 ptrtoint ([6 x i32]* @reltable.dns_class_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([3 x i8]* @.str.1 to i64), i64 ptrtoint ([6 x i32]* @reltable.dns_class_string to i64)) to i32)]
define i8* @dns_class_string(i32 %0) {
%2 = add i32 %0, -128
%3 = icmp ult i32 %2, 6
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 ([6 x i32]* @reltable.dns_class_string to i8*), i64 %6)
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ getelementptr inbounds ([3 x i8], [3 x i8]* @.str.6, i64 0, i64 0), %1 ]
ret i8* %9
}