#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 */

/* Variables and functions */
#define IPPROTO_EGP 141
#define IPPROTO_GRE 140
#define IPPROTO_ICMP 139
#define IPPROTO_IDP 138
#define IPPROTO_IGMP 137
#define IPPROTO_IP 136
#define IPPROTO_IPIP 135
#define IPPROTO_IPV6 134
#define IPPROTO_PIM 133
#define IPPROTO_PUP 132
#define IPPROTO_RAW 131
#define IPPROTO_RSVP 130
#define IPPROTO_TCP 129
#define IPPROTO_UDP 128
char *GetProtocol(int value) {
  switch (value) {
  case IPPROTO_IP:
    return "IP";
  case IPPROTO_ICMP:
    return "ICMP";
  case IPPROTO_IGMP:
    return "IGMP";
  case IPPROTO_IPIP:
    return "IPIP";
  case IPPROTO_TCP:
    return "TCP";
  case IPPROTO_EGP:
    return "EGP";
  case IPPROTO_PUP:
    return "PUP";
  case IPPROTO_UDP:
    return "UDP";
  case IPPROTO_IDP:
    return "IDP";
  case IPPROTO_RSVP:
    return "RSVP";
  case IPPROTO_GRE:
    return "GRE";
  case IPPROTO_IPV6:
    return "IPV6/4";
  case IPPROTO_PIM:
    return "PIM";
  case IPPROTO_RAW:
    return "RAW";
  default:
    return "???";
  }
}


x86 assembly (clang, -O0):
<GetProtocol>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0xffffff80,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0xd,%eax
ja     1210 <GetProtocol+0x110>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf0d(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <GetProtocol+0x11b>
lea    0xef1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <GetProtocol+0x11b>
lea    0xee6(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <GetProtocol+0x11b>
lea    0xedb(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <GetProtocol+0x11b>
lea    0xed0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <GetProtocol+0x11b>
lea    0xec4(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <GetProtocol+0x11b>
lea    0xeb8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <GetProtocol+0x11b>
lea    0xeac(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <GetProtocol+0x11b>
lea    0xea0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <GetProtocol+0x11b>
lea    0xe94(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <GetProtocol+0x11b>
lea    0xe89(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <GetProtocol+0x11b>
lea    0xe7d(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <GetProtocol+0x11b>
lea    0xe74(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <GetProtocol+0x11b>
lea    0xe68(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    121b <GetProtocol+0x11b>
lea    0xe5c(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<GetProtocol>:
add    $0xffffff80,%edi
cmp    $0xd,%edi
ja     111a <GetProtocol+0x1a>
movslq %edi,%rax
lea    0xf2e(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf1a(%rip),%rax
ret

LLVM IR (-O0):
@.str = [3 x i8] c"IP\00"
@.str.1 = [5 x i8] c"ICMP\00"
@.str.2 = [5 x i8] c"IGMP\00"
@.str.3 = [5 x i8] c"IPIP\00"
@.str.4 = [4 x i8] c"TCP\00"
@.str.5 = [4 x i8] c"EGP\00"
@.str.6 = [4 x i8] c"PUP\00"
@.str.7 = [4 x i8] c"UDP\00"
@.str.8 = [4 x i8] c"IDP\00"
@.str.9 = [5 x i8] c"RSVP\00"
@.str.10 = [4 x i8] c"GRE\00"
@.str.11 = [7 x i8] c"IPV6/4\00"
@.str.12 = [4 x i8] c"PIM\00"
@.str.13 = [4 x i8] c"RAW\00"
@.str.14 = [4 x i8] c"???\00"
define i8* @GetProtocol(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %19 [
i32 136, label %5
i32 139, label %6
i32 137, label %7
i32 135, label %8
i32 129, label %9
i32 141, label %10
i32 132, label %11
i32 128, label %12
i32 138, label %13
i32 130, label %14
i32 140, label %15
i32 134, label %16
i32 133, label %17
i32 131, label %18
]
5: ; preds = %1
store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i8** %2
br label %20
6: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %20
7: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %20
8: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %20
9: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %20
10: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %20
11: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %20
12: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %20
13: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %20
14: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %20
15: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.10, i64 0, i64 0), i8** %2
br label %20
16: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %20
17: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.12, i64 0, i64 0), i8** %2
br label %20
18: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %20
19: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 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 = [3 x i8] c"IP\00"
@.str.1 = [5 x i8] c"ICMP\00"
@.str.2 = [5 x i8] c"IGMP\00"
@.str.3 = [5 x i8] c"IPIP\00"
@.str.4 = [4 x i8] c"TCP\00"
@.str.5 = [4 x i8] c"EGP\00"
@.str.6 = [4 x i8] c"PUP\00"
@.str.7 = [4 x i8] c"UDP\00"
@.str.8 = [4 x i8] c"IDP\00"
@.str.9 = [5 x i8] c"RSVP\00"
@.str.10 = [4 x i8] c"GRE\00"
@.str.11 = [7 x i8] c"IPV6/4\00"
@.str.12 = [4 x i8] c"PIM\00"
@.str.13 = [4 x i8] c"RAW\00"
@.str.14 = [4 x i8] c"???\00"
@reltable.GetProtocol = [14 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.7 to i64), i64 ptrtoint ([14 x i32]* @reltable.GetProtocol to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.4 to i64), i64 ptrtoint ([14 x i32]* @reltable.GetProtocol to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.9 to i64), i64 ptrtoint ([14 x i32]* @reltable.GetProtocol to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.13 to i64), i64 ptrtoint ([14 x i32]* @reltable.GetProtocol to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.6 to i64), i64 ptrtoint ([14 x i32]* @reltable.GetProtocol to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.12 to i64), i64 ptrtoint ([14 x i32]* @reltable.GetProtocol to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.11 to i64), i64 ptrtoint ([14 x i32]* @reltable.GetProtocol to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.3 to i64), i64 ptrtoint ([14 x i32]* @reltable.GetProtocol to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([3 x i8]* @.str to i64), i64 ptrtoint ([14 x i32]* @reltable.GetProtocol to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.2 to i64), i64 ptrtoint ([14 x i32]* @reltable.GetProtocol to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.8 to i64), i64 ptrtoint ([14 x i32]* @reltable.GetProtocol to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.1 to i64), i64 ptrtoint ([14 x i32]* @reltable.GetProtocol to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.10 to i64), i64 ptrtoint ([14 x i32]* @reltable.GetProtocol to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.5 to i64), i64 ptrtoint ([14 x i32]* @reltable.GetProtocol to i64)) to i32)]
define i8* @GetProtocol(i32 %0) {
%2 = add i32 %0, -128
%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.GetProtocol to i8*), i64 %6)
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ getelementptr inbounds ([4 x i8], [4 x i8]* @.str.14, i64 0, i64 0), %1 ]
ret i8* %9
}