#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 uint8_t;

/* Variables and functions */
char *print_msg_type(uint8_t msgtype) {
  char *ret;
  switch (msgtype) {
  case 1:
    ret = "DHCP DISCOVER";
    break;
  case 2:
    ret = "DHCP OFFER";
    break;
  case 5:
    ret = "DHCP ACK";
    break;
  default:
    ret = "unknown";
  }
  return ret;
}


x86 assembly (clang, -O0):
<print_msg_type>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0x4(%rbp)
mov    -0x4(%rbp),%eax
mov    %eax,-0x14(%rbp)
sub    $0x1,%eax
je     113d <print_msg_type+0x3d>
jmp    111b <print_msg_type+0x1b>
mov    -0x14(%rbp),%eax
sub    $0x2,%eax
je     114d <print_msg_type+0x4d>
jmp    112c <print_msg_type+0x2c>
mov    -0x14(%rbp),%eax
sub    $0x5,%eax
je     115d <print_msg_type+0x5d>
jmp    116d <print_msg_type+0x6d>
lea    0xebc(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1178 <print_msg_type+0x78>
lea    0xeba(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1178 <print_msg_type+0x78>
lea    0xeb5(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1178 <print_msg_type+0x78>
lea    0xeae(%rip),%rax
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<print_msg_type>:
add    $0xffffffff,%edi
cmp    $0x4,%edi
ja     111a <print_msg_type+0x1a>
movslq %edi,%rax
lea    0xf1a(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf01(%rip),%rax
ret

LLVM IR (-O0):
@.str = [14 x i8] c"DHCP DISCOVER\00"
@.str.1 = [11 x i8] c"DHCP OFFER\00"
@.str.2 = [9 x i8] c"DHCP ACK\00"
@.str.3 = [8 x i8] c"unknown\00"
define i8* @print_msg_type(i32 %0) {
%2 = alloca i32
%3 = alloca i8*
store i32 %0, i32* %2
%4 = load i32, i32* %2
switch i32 %4, label %8 [
i32 1, label %5
i32 2, label %6
i32 5, label %7
]
5: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str, i64 0, i64 0), i8** %3
br label %9
6: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8** %3
br label %9
7: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.2, i64 0, i64 0), i8** %3
br label %9
8: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.3, i64 0, i64 0), i8** %3
br label %9
9: ; preds = %8, %7, %6, %5
%10 = load i8*, i8** %3
ret i8* %10
}

LLVM IR (-O2):
@.str = [14 x i8] c"DHCP DISCOVER\00"
@.str.1 = [11 x i8] c"DHCP OFFER\00"
@.str.2 = [9 x i8] c"DHCP ACK\00"
@.str.3 = [8 x i8] c"unknown\00"
@reltable.print_msg_type = [5 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str to i64), i64 ptrtoint ([5 x i32]* @reltable.print_msg_type to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([11 x i8]* @.str.1 to i64), i64 ptrtoint ([5 x i32]* @reltable.print_msg_type to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.3 to i64), i64 ptrtoint ([5 x i32]* @reltable.print_msg_type to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.3 to i64), i64 ptrtoint ([5 x i32]* @reltable.print_msg_type to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([9 x i8]* @.str.2 to i64), i64 ptrtoint ([5 x i32]* @reltable.print_msg_type to i64)) to i32)]
define i8* @print_msg_type(i32 %0) {
%2 = add i32 %0, -1
%3 = icmp ult i32 %2, 5
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 ([5 x i32]* @reltable.print_msg_type 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.3, i64 0, i64 0), %1 ]
ret i8* %9
}